COSMOS-Web: Stellar mass assembly in relation to dark matter halos across 0.2 < z < 12 of cosmic history

We study the stellar mass assembly of galaxies via the stellar mass function (SMF) and the coevolution with dark matter halos via abundance matching in the largest redshift range to date, 0.2 < z < 12. We used the 0.53 deg 2 imaged by JWST from the COSMOS-Web survey, in combination with ancillary imaging in over 30 photometric bands, to select highly complete samples (down to log M ⋆ / M ⊙ = 7.5 − 8.8) in 15 redshift bins. Our results show that the normalization of the SMF monotonically decreases from z = 0.2 to z = 12 with strong mass-dependent evolution. At z > 5, we find increased abundances of massive (log M ⋆ / M ⊙ > 10.5) systems compared to predictions from semi-analytical models and…

• NR
  National Research Foundation
• AN
  Agence Nationale de la Recherche

  Award: ANR-22-CE31-0007
• DG
  Danmarks Grundforskningsfond
• CN
  Centre National d’Etudes Spatiales
• ES
  European Southern Observatory

  Awards: 179.A-2005, 198.A-2003