Scientists shared new findings and updates from NASA’s James Webb Space Telescope, also called “Webb” or “JWST,” at press conferences during the 241st meeting of the American Astronomical Society (AAS) in Seattle, from Jan. 8 to 12.

Scientists from NASA and universities shared Webb results from multiple different scientific disciplines, ranging from the early universe and galaxy evolution to exoplanet atmospheres and young star formation.

An Early Look at the Evolution of Galaxy Structure at z = 3-9 with JWST

Scientists analyzed the morphologies, or visual appearance and structure, of 850 distant galaxies from observations with Webb’s Near Infrared Camera (NIRCam) instrument and compared them to their morphologies based on previous Hubble Space Telescope imaging. The term “z” denotes the redshift of the galaxies observed and is a measure of the distance of the object. As part of the Cosmic Evolution Early Release Science (CEERS) Survey, scientists conducted visual classifications of each galaxy as well as quantitative measurements of galaxy structure. Overall, the findings showed galaxies with a wide diversity of morphologies out to the highest redshifts, and many that have different morphologies than previously seen with Hubble. More here.

Finding Peas in the Early Universe with JWST

A new analysis of distant galaxies imaged by Webb shows that they are extremely young and share some remarkable similarities to “green peas,” a rare class of small galaxies that still exist in our cosmic backyard. Green pea galaxies appear as small, round, unresolved dots with a distinctly green shade. Researchers made connections between far-off galaxies from Webb’s First Deep Field and these nearby galaxies, which can be studied in more detail. More here.

A trio of faint objects (circled) captured in the James Webb Space Telescope’s deep image of the galaxy cluster SMACS 0723 exhibit properties remarkably similar to rare, small galaxies called “green peas” found much closer to home. The cluster’s mass makes it a gravitational lens, which both magnifies and distorts the appearance of background galaxies. We view these early peas as they existed when the universe was about 5% its current age of 13.8 billion years. The farthest pea, at left, contains just 2% the oxygen abundance of a galaxy like our own and might be the most chemically primitive galaxy yet identified. Credits: NASA, ESA, CSA, and STScI.
[…] Read more in the original article: NASA



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