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

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 5<z<7, with median z=6.9^{+1.0}_{-1.6}. Surprisingly, despite their red long-wavelength colors, these EROs... Show more