James Webb Space Telescope Feed Post

Date: 6/14/2024

Arxiv: Unveiling the hidden universe with JWST: The contribution of dust-obscured galaxies to the stellar mass function at z\sim3-8 Published: 10/5/2023 9:00:01 PM Updated: 6/13/2024 12:53:54 PM

Paper abstract: With the advent of JWST, we can probe the rest-frame optical emission ofgalaxies at z>3 with high sensitivity and spatial resolution, making itpossible to accurately characterise red, optically-faint galaxies and thus movetowards a more complete census of the galaxy population at high redshifts. Tothis end, we present a sample of 148 massive, dusty galaxies from theJWST/CEERS survey, colour-selected using solely JWST bands. With deepJWST/NIRCam data from 1.15\mum to 4.44\mum and ancillary HST/ACS and WFC3data, we determine the physical properties of our sample using spectral energydistribution fitting with BAGPIPES. We demonstrate that our selection methodefficiently identifies massive (\mathrm{\langle \log M_*/M_\odot \rangle~ 10}) and dusty (\mathrm{\langle A_V\rangle ~ 2.7\ mag}) sources,with a majority at z>3 and predominantly lying on the galaxy main-sequence.The main results of this work are the stellar mass functions (SMF) of red,optically-faint galaxies from redshifts between 3=9.25} may have been underestimated in pre-JWST studies byup to ~15-20\% at z~3-6, and up to ~45\% at z~6-8,indicating the rapid onset of obscured stellar mass assembly in the earlyuniverse.