James Webb Space Telescope discovers candidates for most distant...

James Webb Space Telescope discovers candidates for most distant galaxies yet

-

artist's depiction

An artist’s impression of one of the first galaxies.
(Image credit: NASA/ESA/ESO/Wolfram Freudling et al. (STECF).)

Astronomers have spotted what may be the two most distant galaxies ever seen hiding in early-release images from NASA’s newest space telescope.

The James Webb Space Telescope‘s early science work includes a program called the Grism Lens-Amplified Survey from Space, or GLASS. Through GLASS, astronomers are scrutinizing the galaxy cluster Abell 2744, which is so massive that its gravity is able to distort the space around it and act as a gravitational lens to magnify the images of far more distant galaxies behind it.

Astronomers led by Rohan Naidu of the Harvard–Smithsonian Center for Astrophysics discovered the two candidate galaxies, called GLASS-z11 and GLASS-z13, in the first batch of data from GLASS. The galaxies’ designations come from the fact that astronomers have measured their “redshifts” to be 11 and 13 respectively. 

Gallery: James Webb Space Telescope’s 1st photos

Redshift is a measure of how much a galaxy’s light has been stretched by the expansion of the universe; the higher the redshift, the farther away (and the farther back in time) we see the source. The redshifts of 11 and 13 mean that we see these two galaxies as they existed over 13.4 billion years ago, just 400 and 300 million years after the Big Bang respectively. 

The findings are not yet conclusive; the galaxies’ redshifts have only been measured based on the color of their light using Webb’s Near Infrared Camera (NIRCam). Confirming their redshifts will astronomers to analyze each galaxy’s spectrum — the “barcode” that measures how much light of each wavelength is present — and determine how much light emitted by specific atoms and molecules has been redshifted. 

Webb’s Near Infrared Spectrograph (NIRSpec) instrument is already scheduled to conduct these studies. If that work confirms the apparent redshifts, then the two galaxies will be something of a surprise to astronomers. The area of sky surveyed by GLASS so far amounts to 50 square arcminutes (the full moon measures 31 arcminutes across), and yet in that area it has already discovered two galaxies with a redshift of 11 or greater. 

That abundance would indicate that luminous galaxies in the very early universe are more common than expected. The detection also implies, Naidu’s team wrote, that Webb will discover many more galaxies such as these, and perhaps even more distant ones, in its observations going forward. 

a bright red blob

GLASS-z13, a candidate for the most distant known galaxy, as seen by the James Webb Space Telescope.  (Image credit: Naidu et al. 2022. Image: Pascal Oesch (University of Geneva & Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen). Raw data: T. Treu (UCLA) and GLASS-JWST. NASA/CSA/ESA/STScI)

Locating these luminous early galaxies is important because their fast formation suggests that they can be used to trace regions of galaxy formation in the early universe. And since galaxies form where the most matter is concentrated, mapping these early galaxies will also tell us about the distribution of normal and dark matter just a few hundred million years after the Big Bang.

Another surprising discovery is that GLASS-z11 shows indications that it is elongated, with a burgeoning spiral disk. The current confirmed most-distant galaxy, GN-z11, also appears to sport a disk. While most galaxies discovered at high redshift usually appear clumpy, GLASS-z11 and GN-z11 show that it was possible for galactic structure to develop quite quickly.

GLASS-z11 and GLASS-z13 are modest galaxies in comparison to our Milky Way galaxy, which is about 100,000 light-years across and contains approximately 200 billion stars. GLASS-z11 and GLASS-z13 are, however, large for their time, with diameters of between 3,000 and 4,500 light-years, and containing stars with total mass equivalent to on the order of a billion suns, many of them highly luminous. 

According to our theories of galaxy formation, in the time that has passed since the images we see of them, both GLASS-z11 and GLASS-z13 will have grown substantially through mergers with other galaxies, and perhaps developed into giant elliptical galaxies. Meanwhile, cosmic expansion has carried GLASS-z11 and GLASS-z13 farther away from us, and today they are over 32 billion light-years away from us — far beyond where any telescope can reach.

The findings are reported in a pre-print posted to arXiv.org on Tuesday (July 19); the research has also been submitted to the Astrophysical Journal Letters.

Follow Keith Cooper on Twitter @21stCenturySETI. Follow us on Twitter @Spacedotcom and on Facebook. 

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: community@space.com.

Keith Cooper

Keith Cooper is a freelance science journalist and editor in the United Kingdom, and has a degree in physics and astrophysics from the University of Manchester. He’s the author of “The Contact Paradox: Challenging Our Assumptions in the Search for Extraterrestrial Intelligence” (Bloomsbury Sigma, 2020) and has written articles on astronomy, space, physics and astrobiology for a multitude of magazines and websites.

Read More

Latest news

Processing a Tragedy in Monterey Park

The news that a mass shooting had taken place at a ballroom-dance studio in the Los Angeles County city...

EcoPoxy Products Are Now Available Online for Sale

Emigrant, MT, 27th January 2023, ZEXPRWIRE, All American Woodworks is thrilled to announce that they have updated their inventory...

Ainnova Tech announces Dr. Maziar Lalezary, M.D. as Medical advisor and member of Medical Board

Renowned Ophthalmologist joins to the team to accelerate development of early detection solutions with AI for retinal imaging Houston, Texas,...

Top-5 hospitality trends to look out for in 2023

Mumbai, India, 27th January 2023, ZEXPRWIRE, The hospitality sector was affected by Covid 19 in a way similar to...
- Advertisement -spot_img

Dr. Safi Chand, the owner of New Market Animal Hospital Launched Pet Healthcare Library

New Market, Maryland, 27th January 2023, ZEXPRWIRE, Dr. Safi Chand is a veterinarian and the owner of New Market Animal...

Nashville Religion Communicators to Tour Nashville Public Radio

The Nashville Chapter of the Religion Communicators Council (RCC) meets monthly to talk about topics of interest and hear...

Must read

- Advertisement -spot_imgspot_imgspot_imgspot_img

You might also likeRELATED
Recommended to you