NASA’s Webb Reaches New Milestone in Quest for Distant Galaxies

Editor’s Note: This post highlights data from Webb science in progress, which has not yet been through the peer-review process.

An international team of astronomers has used data from NASA’s James Webb Space Telescope to report the discovery of the earliest galaxies confirmed to date. The light from these galaxies has taken more than 13.4 billion years to reach us, as these galaxies date back to less than 400 million years after the big bang, when the universe was only 2% of its current age.

Earlier data from Webb had provided candidates for such infant galaxies. Now, these targets have been confirmed by obtaining spectroscopic observations, revealing characteristic and distinctive patterns in the fingerprints of light coming from these incredibly faint galaxies.

“It was crucial to prove that these galaxies do, indeed, inhabit the early universe. It’s very possible for closer galaxies to masquerade as very distant galaxies,” said astronomer and co-author Emma Curtis-Lake from the University of Hertfordshire in the United Kingdom. “Seeing the spectrum revealed as we hoped, confirming these galaxies as being at the true edge of our view, some further away than Hubble could see! It is a tremendously exciting achievement for the mission.”

Infographic of the spectra of four distant galaxies, showing the shift of the location of a spectral feature called the Lyman break, and the relationship between shift and time since the light was emitted, with images for reference.
The Webb Advanced Deep Extragalactic Survey (JADES) focused on the area in and around the
Hubble Space Telescope’s Ultra Deep Field. Using Webb’s NIRCam instrument, scientists observed the field in nine different infrared wavelength ranges. From these images (shown at left), the team searched for faint galaxies that are visible in the infrared but whose spectra abruptly cut off at a critical wavelength known as the Lyman break. Webb’s NIRSpec instrument then yielded a precise measurement of each galaxy’s redshift (shown at right). Four of the galaxies studied are particularly special, as they were revealed to be at an unprecedentedly early epoch. These galaxies date back to less than 400 million years after the big bang, when the universe was only 2% of its current age.
In the background image blue represents light at 1.15 microns (115W), green is 2.0 microns (200W), and red is 4.44 microns (444W). In the cutout images blue is a combination of 0.9 and 1.15 microns (090W+115W), green is 1.5 and 2.0 microns (150W+200W), and red is 2.0, 2.77, and 4.44 microns (200W+277W+444W).
Image Credit: NASA, ESA, CSA, and STScI, M. Zamani (ESA/Webb), L. Hustak (STScI). Science: B. Robertson (UCSC), S. Tacchella (Cambridge), E. Curtis-Lake (Hertfordshire), S. Carniani (Scuola Normale Superiore), and the JADES Collaboration
Download the full-resolution version from the Space Telescope Science Institute.

The observations resulted from a collaboration of scientists who led the development of two of the instruments on board Webb, the Near-Infrared Camera (NIRCam) and the Near-Infrared Spectrograph (NIRSpec). The investigation of the faintest and earliest galaxies was the leading motivation behind the concepts for these instruments. In 2015 the instrument teams joined together to propose the JWST Advanced Deep Extragalactic Survey (JADES), an ambitious program that has been allocated just over one month of the telescope’s time spread over two years, and is designed to provide a view of the early universe unprecedented in both depth and detail. JADES is an international collaboration of more than eighty astronomers from ten countries. “These results are the culmination of why the NIRCam and NIRSpec teams joined together to execute this observing program,” shared co-author Marcia Rieke, NIRCam principal investigator, of the University of Arizona in Tucson.

The first round of JADES observations focused on the area in and around the Hubble Space Telescope’s Ultra Deep Field. For over 20 years, this small patch of sky has been the target of nearly all large telescopes, building an exceptionally sensitive data set spanning the full electromagnetic spectrum. Now Webb is adding its unique view, providing the faintest and sharpest images yet obtained.

The JADES program began with NIRCam, using over 10 days of mission time to observe the field in nine different infrared colors, and producing exquisite images of the sky. The region is 15 times larger than the deepest infrared images produced by the Hubble Space Telescope, yet is even deeper and sharper at these wavelengths. The image is only the size a human appears when viewed from a mile away. However, it teems with nearly 100,000 galaxies, each caught at some moment in their history, billions of years in the past.

“For the first time, we have discovered galaxies only 350 million years after the big bang, and we can be absolutely confident of their fantastic distances,” shared co-author Brant Robertson from the University of California Santa Cruz, a member of the NIRCam science team. “To find these early galaxies in such stunningly beautiful images is a special experience.”

From these images, the galaxies in the early universe can be distinguished by a tell-tale aspect of their multi-wavelength colors. Light is stretched in wavelength as the universe expands, and the light from these youngest galaxies has been stretched by a factor of up to 14. Astronomers search for faint galaxies that are visible in the infrared but whose light abruptly cuts off at a critical wavelength. The location of the cutoff within each galaxy’s spectrum is shifted by the universe’s expansion. The JADES team scoured the Webb images looking for these distinctive candidates.

They then used the NIRSpec instrument, for a single observation period spanning three days totaling 28 hours of data collection. The team collected the light from 250 faint galaxies, allowing astronomers to study the patterns imprinted on the spectrum by the atoms in each galaxy. This yielded a precise measurement of each galaxy’s redshift and revealed the properties of the gas and stars in these galaxies.

“These are by far the faintest infrared spectra ever taken,” said astronomer and co-author Stefano Carniani from Scuola Normale Superiore in Italy. “They reveal what we hoped to see: a precise measurement of the cutoff wavelength of light due to the scattering of intergalactic hydrogen.”

Four of the galaxies studied are particularly special, as they were revealed to be at an unprecedentedly early epoch. The results provided spectroscopic confirmation that these four galaxies lie at redshifts above 10, including two at redshift 13. This corresponds to a time when the universe was approximately 330 million years old, setting a new frontier in the search for far-flung galaxies. These galaxies are extremely faint because of their great distance from us. Astronomers can now explore their properties, thanks to Webb’s exquisite sensitivity.

Astronomer and co-author Sandro Tacchella from the University of Cambridge in the United Kingdom explained, “It is hard to understand galaxies without understanding the initial periods of their development. Much as with humans, so much of what happens later depends on the impact of these early generations of stars. So many questions about galaxies have been waiting for the transformative opportunity of Webb, and we’re thrilled to be able to play a part in revealing this story.”

On a black background, two white, rectangular outlines are connected at one corner. Within the two outlines are hundreds of small galaxies of all colors.
This image taken by the James Webb Space Telescope highlights the region of study by the Webb Advanced Deep Extragalactic Survey (JADES). This area is in and around the Hubble Space Telescope’s Ultra Deep Field. Scientists used Webb’s NIRCam instrument to observe the field in nine different infrared wavelength ranges. From these images, the team searched for faint galaxies that are visible in the infrared but whose spectra abruptly cut off at a critical wavelength. They conducted additional observations (not shown here) with Webb’s NIRSpec instrument to measure each galaxy’s redshift and reveal the properties of the gas and stars in these galaxies.
In this image blue represents light at 1.15 microns (115W), green is 2.0 microns (200W), and red is 4.44 microns (444W).
Image Credit: NASA, ESA, CSA, and M. Zamani (ESA/Webb). Science: B. Robertson (UCSC), S. Tacchella (Cambridge), E. Curtis-Lake (Hertfordshire), S. Carniani (Scuola Normale Superiore), and the JADES Collaboration.
Download the full-resolution version from the Space Telescope Science Institute.

JADES will continue in 2023 with a detailed study of another field, this one centered on the iconic Hubble Deep Field, and then return to the Ultra Deep Field for another round of deep imaging and spectroscopy. Many more candidates in the field await spectroscopic investigation, with hundreds of hours of additional time already approved.

The James Webb Space Telescope is the world’s premier space science observatory. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).

Release on ESA website

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Alise Fisher
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Laura Betz
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Webb, Keck Telescopes Team Up to Track Clouds on Saturn’s Moon Titan

Editor’s Note: This post highlights data from Webb science in progress, which has not yet been through the peer-review process.

On the morning of Saturday, Nov. 5, an international team of planetary scientists woke up with great delight to the first Webb images of Saturn’s largest moon, Titan. Here, Principal Investigator Conor Nixon and others on the Guaranteed Time Observation (GTO) program 1251 team using Webb to investigate Titan’s atmosphere and climate describe their initial reactions to seeing the data.

Titan is the only moon in the solar system with a dense atmosphere, and it is also the only planetary body other than Earth that currently has rivers, lakes, and seas. Unlike Earth, however, the liquid on Titan’s surface is composed of hydrocarbons including methane and ethane, not water. Its atmosphere is filled with thick haze that obscures visible light reflecting off the surface.

We had waited for years to use Webb’s infrared vision to study Titan’s atmosphere, including its fascinating weather patterns and gaseous composition, and also see through the haze to study albedo features (bright and dark patches) on the surface. Titan’s atmosphere is incredibly interesting, not only due to its methane clouds and storms, but also because of what it can tell us about Titan’s past and future – including whether it always had an atmosphere. We were absolutely delighted with the initial results.

Team member Sebastien Rodriguez from the Universite Paris Cité was the first to see the new images, and alerted the rest of us via email: What a wake-up this morning (Paris time)! Lots of alerts in my mailbox! I went directly to my computer and started at once to download the data. At first glance, it is simply extraordinary! I think we’re seeing a cloud!” Webb Solar System GTO Project Lead Heidi Hammel, from the Association of Universities for Research in Astronomy (AURA), had a similar reaction: “Fantastic! Love seeing the cloud and the obvious albedo markings. So looking forward to the spectra! Congrats, all!!! Thank you!”

Thus began a day of frantic activity. By comparing different images captured by Webb’s Near-Infrared Camera (NIRCam), we soon confirmed that a bright spot visible in Titan’s northern hemisphere was in fact a large cloud. Not long after, we noticed a second cloud. Detecting clouds is exciting because it validates long-held predictions from computer models about Titan’s climate, that clouds would form readily in the mid-northern hemisphere during its late summertime when the surface is warmed by the Sun.

Side-by-side images of Saturn’s moon Titan, captured by Webb’s Near-Infrared Camera on November 4, 2022. Left image labeled “lower atmosphere and clouds” is various shades of red, from nearly black to nearly white. Three bright spots are labeled. Spot along the edge at 11 o’clock is labeled “Cloud A.” A larger, brighter spot at 1 o’clock is labeled “Cloud B.” A nearly white, crescent-shaped spot along the bottom from about 5 to 7 o’clock is labeled “Atmospheric Haze.” Right image labeled “atmosphere and surface,” is shades of white, blue, and brown. Clouds A and B are bright spots in the same locations as in the left-hand image. Cloud A, at 11 o’clock, is quite small and subtle. Cloud B, at 1 o’clock, is brighter and appears larger than in the left-hand image. Three surface features are labeled: Dark patch near Cloud A labeled “Kraken Mare.” Dark patch in middle lower right quadrant labeled “Belet.” Bright patch just inside the edge at about 4 o’clock labeled “Adiri.”
Images of Saturn’s moon Titan, captured by the James Webb Space Telescope’s NIRCam instrument Nov. 4, 2022. Left: Image using F212N, a 2.12-micron filter sensitive to Titan’s lower atmosphere. The bright spots are prominent clouds in the northern hemisphere. Right: Color composite image using a combination of NIRCam filters: Blue=F140M (1.40 microns), Green=F150W (1.50 microns), Red=F200W (1.99 microns), Brightness=F210M (2.09 microns). Several prominent surface features are labeled: Kraken Mare is thought to be a methane sea; Belet is composed of dark-colored sand dunes; Adiri is a bright albedo feature. Download the full-resolution version from the Space Telescope Science Institute . Image credit: NASA, ESA, CSA, A. Pagan (STScI). Science: Webb Titan GTO Team.

We then realized it was important to find out if the clouds were moving or changing shape, which might reveal information about the air flow in Titan’s atmosphere. So we quickly reached out to colleagues to request follow-up observations using the Keck Observatory in Hawai’i that evening. Our Webb Titan team lead Conor Nixon from NASA’s Goddard Space Flight Center wrote to Imke de Pater at University of California, Berkeley, and Katherine de Kleer at Caltech, who have extensive experience using Keck: “We just received our first images of Titan from Webb, taken last night. Very exciting! There appears to be a large cloud, we believe over the northern polar region near Kraken Mare. We were wondering about a quick response follow-up observation on Keck to see any evolution in the cloud?”

After negotiations with the Keck staff and observers who had already been scheduled to use the telescope that evening, Imke and Katherine quickly queued up a set of observations. The goal was to probe Titan from its stratosphere to surface, to try to catch the clouds we saw with Webb. The observations were a success! Imke de Pater commented: “We were concerned that the clouds would be gone when we looked at Titan two days later with Keck, but to our delight there were clouds at the same positions, looking like they had changed in shape.”

Side-by-side images of the atmosphere and surface of Saturn’s moon Titan, captured by Webb (left) and Keck (right). Both images are various shades of white, blue, and brown. Left: Webb NIRCam image captured on November 4, 2022. Three features are labeled: A bright spot along the edge at 11 o’clock is labeled “Cloud A.” A larger, brighter spot at 1 o’clock is labeled “Cloud B.” A dark patch in middle lower right quadrant is labeled “Belet.” Right: Keck NIRC-2 image captured on November 6, 2022. The same three features are labeled. They are in the same positions relative to each other, but appear to have moved or rotated slightly to the right. Cloud A appears somewhat larger than in the November 4 Webb image. Cloud B appears somewhat smaller. Belet, a dark feature, is now closer to the eastern edge of the visible hemisphere.
Evolution of clouds on Titan over 30 hours between Nov. 4 and Nov. 6, 2022, as seen by Webb NIRCam (left) and Keck NIRC-2 (right). Titan’s trailing hemisphere seen here is rotating from left (dawn) to right (evening) as seen from Earth and the Sun. Cloud A appears to be rotating into view while Cloud B appears to be either dissipating or moving behind Titan’s limb (around toward the hemisphere facing away from us). Clouds are not long-lasting on Titan or Earth, so those seen on Nov. 4 may not be the same as those seen on Nov. 6. The NIRCam image used the following filters: Blue=F140M (1.40 microns), Green=F150W (1.50 microns), Red=F200W (1.99 microns), Brightness=F210M (2.09 microns). The Keck NIRC-2 image used: Red=He1b (2.06 microns), Green=Kp (2.12 microns), Blue=H2 1-0 (2.13 microns). Download the full-resolution version from the Space Telescope Science Institute . Image credit: NASA, ESA, CSA, W. M. Keck Observatory, A. Pagan (STScI). Science: Webb Titan GTO Team.

After we got the Keck data, we turned to atmospheric modeling experts to help interpret it. One of those experts, Juan Lora at Yale University, remarked: “Exciting indeed! I’m glad we’re seeing this, since we’ve been predicting a good bit of cloud activity for this season! We can’t be sure the clouds on November 4th and 6th are the same clouds, but they are a confirmation of seasonal weather patterns.”

The team also collected spectra with Webb’s Near-Infrared Spectrograph (NIRSpec), which is giving us access to many wavelengths that are blocked to ground-based telescopes like Keck by Earth’s atmosphere. This data, which we are still analyzing, will enable us to really probe the composition of Titan’s lower atmosphere and surface in ways that even the Cassini spacecraft could not, and to learn more about what is causing the bright feature seen over the south pole.

We are expecting further Titan data from NIRCam and NIRSpec as well as our first data from Webb’s Mid-Infrared Instrument (MIRI) in May or June of 2023. The MIRI data will reveal an even greater part of Titan’s spectrum, including some wavelengths we have never seen before. This will give us information about the complex gases in Titan’s atmosphere, as well as crucial clues to deciphering why Titan is the only moon in the Solar System with a dense atmosphere.

Maël Es-Sayeh, a graduate student at the Universite Paris Cité, is particularly looking forward to these observations: “I will be using the data from Webb in my PhD research, so it’s very exciting to finally get the real data after years of simulations. I can’t wait to see what will come in part two next year!”

About the Authors

      • Conor Nixon, is a planetary scientist at the NASA Goddard Space Flight Center in Greenbelt, Maryland, and serves as Principal Investigator on the Webb Cycle 1 Guaranteed Time Observation program 1251.
      • Co-Investigator Heidi Hammel is a planetary scientist. She is Vice President for Science at AURA and leads the JWST Solar System Science Group.
      • Co-Investigator Sébastien Rodriguez is a planetary scientist at the Institut de Physique du Globe de Paris at the Universite Paris Cité, in France.
      • Imke de Pater is an Emeritus professor of astronomy at the University of California, Berkeley, and is lead of the Keck Titan Observing Team.
      • Katherine de Kleer is an Assistant Professor of Planetary Science and Astronomy at Caltech in Pasadena, California, and is a member of the Keck Titan Observing Team.
      • Juan Lora is an Assistant Professor of Earth & Planetary Sciences at Yale University in New Haven, Connecticut.
      • Maël Es-Sayeh is a graduate student in planetary sciences at Institut de Physique du Globe de Paris of the Universite Paris Cité, in France. 

– Margaret W. Carruthers, Office of Public Outreach, Space Telescope Science Institute

NASA Webb Image Coming This Week

NASA will share a new image or spectrum from the James Webb Space Telescope at least every other week on the mission’s blog. This week, check the blog on Thursday, Dec. 1 at 11 a.m. EST for new images highlighting one of Saturn’s moons.

In the meantime, learn more about what to expect as Webb observations make their way from raw data to published, peer-reviewed science.

News Media Contacts
Alise Fisher
Headquarters, Washington
202-358-2546
alise.m.fisher@nasa.gov

Laura Betz
Goddard Space Flight Center, Greenbelt, Md.
301-286-9030
laura.e.betz@nasa.gov

NASA Webb Micrometeoroid Mitigation Update

Micrometeoroid strikes are an unavoidable aspect of operating any spacecraft. NASA’s James Webb Space Telescope was engineered to withstand continual bombardment from these dust-sized particles moving at extreme velocities, to continue to generate groundbreaking science far into the future.

​​“We have experienced 14 measurable micrometeoroid hits on our primary mirror, and are averaging one to two per month, as anticipated. The resulting optical errors from all but one of these were well within what we had budgeted and expected when building the observatory,” said Mike Menzel, Webb lead mission systems engineer at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “One of these was higher than our expectations and prelaunch models; however, even after this event our current optical performance is still twice as good as our requirements.”

To ensure all parts of the observatory continue to perform at their best, NASA convened a working group of optics and micrometeoroid experts from NASA Goddard‘s Webb team, the telescope’s mirror manufacturer, the Space Telescope Science Institute, and the NASA Meteoroid Environment Office at NASA’s Marshall Space Flight Center in Huntsville, Alabama. After thorough analysis, the team concluded the higher-energy impact observed in May was a rare statistical event both in terms of energy, and in hitting a particularly sensitive location on Webb’s primary mirror. To minimize future impacts of this magnitude, the team has decided that future observations will be planned to face away from what is now known as the ‘micrometeoroid avoidance zone.’

“Micrometeoroids that strike the mirror head on (moving opposite the direction the telescope is moving) have twice the relative velocity and four times the kinetic energy, so avoiding this direction when feasible will help extend the exquisite optical performance for decades,” said Lee Feinberg, Webb optical telescope element manager at NASA Goddard. This does not mean that these areas of the sky cannot be observed, only that observations of those objects will be more safely made at a different time in the year when Webb is in a different location in its orbit. Observations that are time critical, such as solar system targets, will still be done in the micrometeoroid avoidance zone if required. This adjustment to how Webb observations are scheduled will have a long-term statistical benefit.

The team will implement the micrometeoroid avoidance zone starting with Webb’s second year of science, or “Cycle 2.” More information and guidance for Cycle 2 is available on JWST Observer News.

-Thaddeus Cesari, NASA’s Goddard Space Flight Center

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Alise Fisher
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Beneath the Night Sky in a Galaxy (Not Too) Far Away

Editor’s Note: This post highlights data from Webb science in progress, which has not yet been through the peer-review process.

We spoke with Kristen McQuinn of Rutgers University, one of the lead scientists on Webb Early Release Science (ERS) program 1334, focused on resolved stellar populations. These are large groups of stars – including stars within the dwarf galaxy Wolf–Lundmark–Melotte (WLM) – that are close enough for Webb to differentiate between individual stars, but far enough for Webb to capture a large number of stars at once.

Labeled, side-by-side comparison of dwarf galaxy Wolf-Lundmark-Melotte (WLM) images, as seen by Spitzer’s IRAC on the left and Webb’s NIRCam on the right. Spitzer’s view resembles fuzzy white blotches against a black background, while Webb’s view appears much more focused and detailed. In Webb’s image, there are countless white stars dotting the scene, as well as yellow and orange background galaxies of various shapes. One prominent galaxy is a pale yellow spiral in the top left corner. Another defining feature is a large white star with long diffraction spikes, seen just to the right of the top center.
A portion of the dwarf galaxy Wolf–Lundmark–Melotte (WLM) captured by the Spitzer Space Telescope’s Infrared Array Camera (left) and the James Webb Space Telescope’s Near-Infrared Camera (right). The images demonstrate Webb’s remarkable ability to resolve faint stars outside the Milky Way. The Spitzer image shows 3.6-micron light in cyan and 4.5-micron in orange (IRAC1 and IRAC2). The Webb image includes 0.9-micron light shown in blue, 1.5-micron in cyan, 2.5-micron in yellow, and 4.3-micron in red (filters F090W, F150W, F250M, and F430M). Download the full-resolution version from the Space Telescope Science Institute. SCIENCE CREDIT: NASA, ESA, CSA, STScI, and Kristen McQuinn (Rutgers University). IMAGE PROCESSING: Alyssa Pagan (STScI).

So, tell us a bit about this galaxy, WLM. What’s interesting about it?

WLM is a dwarf galaxy in our galactic neighborhood. It’s fairly close to the Milky Way (only about 3 million light-years from Earth), but it’s also relatively isolated. We think WLM hasn’t interacted with other systems, which makes it really nice for testing our theories of galaxy formation and evolution. Many of the other nearby galaxies are intertwined and entangled with the Milky Way, which makes them harder to study.

Another interesting and important thing about WLM is that its gas is similar to the gas that made up galaxies in the early universe. It’s fairly unenriched, chemically speaking. (That is, it’s poor in elements heavier than hydrogen and helium.)

This is because the galaxy has lost many of these elements through something we call galactic winds. Although WLM has been forming stars recentlythroughout cosmic time, reallyand those stars have been synthesizing new elements, some of the material gets expelled from the galaxy when the massive stars explode. Supernovae can be powerful and energetic enough to push material out of small, low-mass galaxies like WLM.

This makes WLM super interesting in that you can use it to study how stars form and evolve in small galaxies like those in the ancient universe.

You arranged to show this image at a planetarium. How did you feel when you saw the image projected on the dome?

It was just inspiring. It really was incredible. I will never look at these images the same again. Seeing this on the dome, it was like looking up at our own night skyat the Milky Wayfrom a dark site. I could imagine that we were standing on a planet in the WLM galaxy and looking up at its night sky.

We can see a myriad of individual stars of different colors, sizes, temperatures, ages, and stages of evolution; interesting clouds of nebular gas within the galaxy; foreground stars with Webb’s diffraction spikes; and background galaxies with neat features like tidal tails. It’s really a gorgeous image.

And, of course, the view is far deeper and better than our eyes could possibly see. Even if you were looking out from a planet in the middle of this galaxy, and even if you could see infrared light, you would need bionic eyes to be able to see what Webb sees.

What are you trying to find out by studying WLM?

The main science focus is to reconstruct the star formation history of this galaxy. Low-mass stars can live for billions of years, which means that some of the stars that we see in WLM today formed in the early universe. By determining the properties of these low-mass stars (like their ages), we can gain insight into what was happening in the very distant past. It’s very complementary to what we learn about the early formation of galaxies by looking at high-redshift systems, where we see the galaxies as they existed when they first formed.

The Early Release Science programs were designed to highlight Webb’s capabilities and help astronomers prepare for future observations. How are you supporting other astronomers with this work?

In a few ways. We’re checking the calibration of the NIRCam instrument itself. We’re checking our stellar evolution models. And we’re developing software to measure star brightnesses.

We already studied this exact same field very carefully with Hubble. Now we’re looking at the near-infrared light with Webb, and we’re using WLM as a sort of standard for comparison (like you would use in a lab) to help us make sure we understand the Webb observations. We want to make sure we’re measuring the stars’ brightnesses really, really accurately and precisely. We also want to make sure that we understand our stellar evolution models in the near-infrared.

Our team is also charged with developing a public software tool to measure the brightness of all the resolved stars in the NIRCam images. This is a non-proprietary tool that everyone will be able to use. We are developing and testing the software, and optimizing the parameters used for measurements. This is a bedrock tool for astronomers around the world. If you want to do anything with resolved stars that are crowded together on the sky, you need a tool like this.

About the Author

Kristen McQuinn is an assistant professor in the Department of Physics and Astronomy at Rutgers University, and co-investigator on Director’s Discretionary Early Release Science program 1334.

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Webb Mid-Infrared Instrument Mode Returns to Functionality

The James Webb Space Telescope’s Mid-Infrared Instrument (MIRI) has four observing modes. On Aug. 24, after measuring increased friction in one of the grating wheels used in MIRI’s medium resolution spectrometry (MRS) mode, the Webb team paused science observations using this specific mode. Since then, a team of experts has carried out an in-depth investigation that has reviewed instrument design as well as historical and postlaunch data.

The team concluded the issue is likely caused by increased contact forces between sub-components of the wheel central bearing assembly under certain conditions. Based on this, the team developed and vetted a plan for how to use the affected mechanism during science operations.

An engineering test was executed Wednesday, Nov. 2, that successfully demonstrated predictions for wheel friction. Webb will resume MIRI MRS science observations by Saturday, Nov. 12, starting with a unique opportunity to observe Saturn’s polar regions, just before they become unobservable by Webb for the next 20 years. The team will schedule additional MRS science observations, initially at a limited cadence, following a plan to keep the affected wheel in balance, monitor wheel health, and prepare MIRI MRS for a return to full science operations.

NASA Webb Image Coming This Week

NASA will share a new image or spectrum from the James Webb Space Telescope at least every other week on the mission’s blog. This week, check the blog on Wednesday, Nov. 9 at 11 a.m. EST for a new image highlighting a nearby dwarf galaxy.

In the meantime, learn more about what to expect as Webb observations make their way from raw data to published, peer-reviewed science.

News Media Contacts

Alise Fisher
Headquarters, Washington
202-358-2546
alise.m.fisher@nasa.gov

Laura Betz
Goddard Space Flight Center, Greenbelt, Md.
301-286-9030
laura.e.betz@nasa.gov

Webb Offers Never-Before-Seen Details of Early Universe

Editor’s Note: This post highlights data from Webb science in progress, which has not yet been through the peer-review process.

NASA’s James Webb Space Telescope was specially designed to detect the faint infrared light from very distant galaxies and give astronomers a glimpse at the early universe. The nature of galaxies during this early period of our universe is not well known nor understood. But with the help of gravitational lensing by a cluster of galaxies in the foreground, faint background galaxies can be magnified and also appear multiple times in different parts of the image.

A James Webb Space Telescope image of galaxy cluster MACS0647 and the very distant galaxy MACS0647-JD. At left, the cluster appears as a sea of galaxies on a black background. The image is punctuated by a few foreground stars with prominent diffraction spikes. Three small boxes outlined in white mark the locations of the three images of galaxy MACS0647-JD. They are numbered 1, 2, and 3. Enlarged images of these boxes appear in a column down the right side of the screen. They are labeled JD 1, JD 2, and JD 3. The three images of MACS0647-JD from Webb show two, distinct features that are differently colored, with the larger area appearing redder and the smaller one appearing bluer.
The massive gravity of galaxy cluster MACS0647 acts as a cosmic lens to bend and magnify light from the more distant MACS0647-JD system. It also triply lensed the JD system, causing its image to appear in three separate locations. These images, which are highlighted with white boxes, are marked JD1, JD2, and JD3; zoomed-in views are shown in the panels at right. In this image from Webb’s Near Infrared Camera (NIRCam) instrument, blue was assigned to wavelengths of 1.15 and 1.5 microns (F115W, F150W), green to wavelengths of 2.0 and 2.77 microns (F200W, F277W) and red to wavelengths of 3.65 and 4.44 microns (F365W, F444W). Download the full-resolution version from the Space Telescope Science Institute. Credits: SCIENCE: NASA, ESA, CSA, STScI, and Tiger Hsiao (Johns Hopkins University) IMAGE PROCESSING: Alyssa Pagan (STScI)

Today, we sit down with three astronomers working on Webb to talk about their latest findings. The team members are Dan Coe of AURA/STScI for the European Space Agency and the Johns Hopkins University; Tiger Hsiao of the Johns Hopkins University; and Rebecca Larson of the University of Texas at Austin. These scientists have been observing the distant galaxy MACS0647-JD with Webb, and they’ve found something interesting.

Dan Coe: I discovered this galaxy MACS0647-JD 10 years ago with the Hubble Space Telescope. At the time, I’d never worked on high redshift galaxies, and then I found this one that was potentially the most distant at redshift 11, about 97 percent of the way back to the big bang. With Hubble, it was just this pale, red dot. We could tell it was really small, just a tiny galaxy in the first 400 million years of the universe. Now we look with Webb, and we’re able to resolve TWO objects! We’re actively discussing whether these are two galaxies or two clumps of stars within a galaxy. We don’t know, but these are the questions that Webb is designed to help us answer.

Tiger Yu-Yang Hsiao: You can also see that the colors between the two objects are so different. One’s bluer; the other one is redder. The blue gas and the red gas have different characteristics. The blue one actually has very young star formation and almost no dust, but the small, red object has more dust inside, and is older. And their stellar masses are also probably different.

It’s really interesting that we see two structures in such a small system. We might be witnessing a galaxy merger in the very early universe. If this is the most distant merger, I will be really ecstatic!

Dan Coe: Due to the gravitational lensing of the massive galaxy cluster MACS0647, it’s lensed into three images: JD1, JD2, and JD3. They’re magnified by factors of eight, five, and two, respectively.

Rebecca Larson: Up to this point, we haven’t really been able to study galaxies in the early universe in great detail. We had only tens of them prior to Webb. Studying them can help us understand how they evolved into the ones like the galaxy we live in today. And also, how the universe evolved throughout time.

I think my favorite part is, for so many new Webb image we get, if you look in the background, there are all these little dots—and those are all galaxies! Every single one of them. It’s amazing the amount of information that we’re getting that we just weren’t able to see before. And this is not a deep field. This is not a long exposure. We haven’t even really tried to use this telescope to look at one spot for a long time. This is just the beginning!

Animation blinks between the James Webb Space Telescope and Hubble Space Telescope images of galaxy cluster MACS0647 and the very distant galaxy MACS0647-JD. In both views, the cluster appears as a sea of galaxies on a black background. Both images are punctuated by a few foreground stars with prominent diffraction spikes. In both views, the massive galaxy cluster MACS0647 appears on the left. Also in both, three small boxes outlined in white mark the locations of the three images of galaxy MACS0647-JD. They are numbered 1, 2, and 3. Enlarged images of these boxes appear in a column down the right side of the screen. They are labeled JD 1, JD 2, and JD 3. In the MACS0647 galaxy cluster, Webb detects many more galaxies than Hubble. The three images of MACS0647-JD from Webb show two, distinct features thatd are differently colored, with the larger area appearing redder and the smaller one appearing bluer. In comparison, the Hubble images show only a single, pale, red, pixelated dot.
This is a comparison between the Hubble Space Telescope images of MACS0647-JD from 2012 (filter information on Hubblesite.org) and the 2022 images from the James Webb Space Telescope (using the same color assignments as the image above). Note that MACS0647-JD appears as a faint, red dot in the Hubble image, but Webb reveals much more detail. Download the full-resolution version from the Space Telescope Science Institute. Credits: SCIENCE: NASA, ESA, CSA, STScI, and Tiger Hsiao (Johns Hopkins University) IMAGE PROCESSING: Alyssa Pagan (STScI)

About the authors:
Dan Coe is an astronomer of AURA/STScI for the European Space Agency and the Johns Hopkins University. Tiger Hsiao is a Ph.D. graduate student at the Johns Hopkins University. Rebecca Larson is a National Science Foundation fellow and Ph.D. graduate student at the University of Texas at Austin. These NIRCam observations of MAC0647-JD are part of the team’s Cycle 1 program GO 1433 (PI Coe). The team is planning more a detailed study of the physical properties of MACS0647-JD with Webb spectroscopy in January 2023. Read the team’s science paper here.


– Ann Jenkins, Principal Science Writer, Office of Public Outreach, Space Telescope Science Institute

 

NASA Webb Image Coming This Week

NASA will share a new image or spectrum from the James Webb Space Telescope at least every other week on the mission’s blog. This week, check the blog on Wednesday, Oct. 26 at 11 a.m. EDT for a new image highlighting a distant, lensed galaxy and intervening galaxy cluster.

In the meantime, learn more about what to expect as Webb observations make their way from raw data to published, peer-reviewed science.

News Media Contacts

Alise Fisher
Headquarters, Washington
202-358-2546
alise.m.fisher@nasa.gov

Laura Betz
Goddard Space Flight Center, Greenbelt, Md.
301-286-9030
laura.e.betz@nasa.gov

Webb Reveals Shells of Dust Surrounding Brilliant Binary Star System

The latest image from NASA‘s James Webb Space Telescope is a new perspective on the binary star Wolf-Rayet 140, revealing details and structure in a new light. Astronomer Ryan Lau of NSF’s NOIRLab, principal investigator of the Webb Early Release Science program that observed the star, shares his thoughts on the observations.

“On the night that my team’s Early Release Science observations of the dust-forming massive binary star Wolf-Rayet (WR) 140 were taken, I was puzzled by what I saw in the preview images from the Mid-Infrared Instrument (MIRI). There seemed to be a strange-looking diffraction pattern, and I worried that it was a visual effect created by the stars’ extreme brightness. However, as soon as I downloaded the final data I realized that I was not looking at a diffraction pattern, but instead rings of dust surrounding WR 140 – at least 17 of them.

A bright white point of light is surrounded by ten to fifteen regularly spaced, hazy rings at its bottom, right, and upper right. The central point, where the stars are located, has a rough hexagon shape. The innermost ring is highlighted blueish white and is much brighter to the right. The outer rings fade from view to the upper left, with only a few close rings visible there. The central light seems to highlight the misshapen rings like a spotlight, with rays coming out diagonally from the upper left to lower right. One ray illuminates even more rings as it travels to the upper right.
Shells of cosmic dust created by the interaction of binary stars appear like tree rings around Wolf-Rayet 140. The remarkable regularity of the shells’ spacing indicates that they form like clockwork during the stars’ eight-year orbit cycle, when the two members of the binary make their closest approach to one another. In this image, blue, green, and red were assigned to Webb’s Mid-Infrared Instrument (MIRI) data at 7.7, 15, and 21 microns (F770W, F1500W, and F2100W filters, respectively). Credit: NASA, ESA, CSA, STScI, JPL-Caltech. Download/View the full-resolution version and supporting visuals from the Space Telescope Science Institute.

“I was amazed. Although they resemble rings in the image, the true 3D geometry of those semi-circular features is better described as a shell. The shells of dust are formed each time the stars reach a point in their orbit where they are closest to each other and their stellar winds interact. The even spacing between the shells indicates that dust formation events are occurring like clockwork, once in each eight-year orbit. In this case, the 17 shells can be counted like tree rings, showing more than 130 years of dust formation. Our confidence in this interpretation of the image was strengthened by comparing our findings to the geometric dust models by Yinuo Han, a doctoral student at the University of Cambridge, which showed a near-perfect match to our observations.

“One of the biggest surprises was how many shells the telescope was able to detect. The shells furthest from the binary star have traversed over 70,000 times the distance from Earth to the Sun, at speeds of around 6 million miles per hour, through the harsh environment around a WR star—some of the hottest and most luminous stars known. The survival of these distant shells shows that the dust formed by WR binaries like WR 140 will likely survive to enrich the surrounding interstellar environment. However, it wasn’t enough for us to see these dusty shells. We wanted to know their spectroscopic signature and chemical composition. What will they add to the interstellar medium?

“With the Medium-Resolution Spectroscopy (MRS) mode on MIRI, we obtained the first spatially resolved mid-infrared spectra of a dust-forming WR binary in our observation of WR 140, and were able to directly probe the chemical signatures of its dust shells. Broad and prominent features in the spectral lines at 6.4 and 7.7 microns told us that the dust was composed of compounds consistent with Polycyclic Aromatic Hydrocarbons (PAHs). This carbonaceous material plays an important role in the interstellar medium and the formation of stars and planets, but its origin is a long-standing mystery. With the combined results of JWST’s MRS spectra and MIRI imaging, we now have evidence that WR binaries can be an important source of carbon-rich compounds that enrich the interstellar environment of our galaxy, and likely galaxies beyond our own.”

About the author:
Ryan Lau is an Assistant Astronomer at the National Science Foundation’s NOIRLab. His team’s observations of WR 140 are the results of the Director’s Discretionary-Early Release Science program 1349. Learn more about the findings here.

Editor’s Note: This post highlights data from a paper appearing today in Nature Astronomy.