The Galaxies Missed by Hubble and ALMA: The Contribution of Extremely Red Galaxies to the Cosmic Census at 3 < z < 8

Abstract Using deep JWST imaging from JADES, JEMS, and SMILES, we characterize optically faint and extremely red galaxies at z > 3 that were previously missing from galaxy census estimates. The data indicate the existence of abundant, dusty, and poststarburst-like galaxies down to 10 8 M ⊙ , below the sensitivity limit of Spitzer and the Atacama Large Millimeter/submillimeter Array (ALMA). Modeling the NIRCam and Hubble Space Telescope (HST) photometry of these red sources can result in extremely high values for both stellar mass and star formation rate (SFR); however, including seven MIRI filters out to 21 μ m results in decreased masses (median 0.6 dex for log 10 ( M ∗ / M ⊙ ) >…

• NS
  National Science Foundation
• NA
  National Aeronautics and Space Administration

  Awards: NAS 5-02015, 5-03127, NAS 5-03127, 80NSSC18K0555
• UO
  University of Arizona
• ST
  Space Telescope Science Institute

  Awards: 5-03127, NAS 5-03127
• EC
  European Commission

  Awards: 789056, 695671
• NS
  Nuclear Safety and Security Commission
• GS
  Goddard Space Flight Center

  Award: 80NSSC18K0555
• SA
  Science and Technology Facilities Council

  Awards: ST/M001172/1, ST/V000918/1, CE170100013, 695671