James Webb Space Telescope Feed Post

Extremely red galaxies at z=5-9 with MIRI and NIRSpec: dusty galaxies or obscured AGNs?

Paper abstract: We study a new population of extremely red objects (EROs) recently discovered by JWST based on their NIRCam colors F277W-F444W >1.5 mag. We find 37 EROs in the CEERS field with F444W <28 mag and photometric redshifts between 57 by up to a factor ~60. Similarly, if they are OSOs with luminosities in the L_{\rm bol}>10^{46-47} erg s^{-1} range, their number would exceed that of bright blue QSOs by more than two orders of magnitude. Additional photometry at mid-IR wavelengths will reveal the true nature of the red continuum emission in these EROs and will place this puzzling population in the right context of galaxy evolution.