The JWST Deep Field contains over 100,000 galaxies. Astronomers identified four that were the first ones to form in the Cosmic Dawn.
,” by Robertson et al. 2022. Neither one has been peer-reviewed yet.
“These results are the culmination of why the NIRCam and NIRSpec teams joined together to execute this observing program,” The JWST captured its Deep Field in the same region of the sky the Hubble captured its Ultra-Deep Field. Telescopes have been studying this region for about 20 years, creating a complete data set across the electromagnetic spectrum. The Webb’s observations build on this archive, adding the deepest, most light-sensitive observations yet.
shared co-author Brant Robertson from the University of California Santa Cruz, a member of the NIRCam science team. The team used the telescope’s NIRSpec instrument to examine the light from 250 of the faintest galaxies in the image over the course of 28 hours. The spectra presented precise measurements of each of the galaxies’ redshifts, revealing the properties of the stars and gas in each one. said astronomer and co-author Stefano Carniani from Scuola Normale Superiore in Italy.
Those are the galaxies astronomers were hoping to spot with the JWST, and that’s what the telescope is doing. These galaxies illuminated theand are critical to understanding how galaxies form and evolve. “Galaxies forming at these times may be the seeds of the much more massive and mature galaxies in the local Universe,” Curtis-Lake and co-authors explain in their paper.
“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,”
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