TY - JOUR
T1 - The stellar mass function of quiescent galaxies in 2 < z < 2.5 protoclusters
AU - Edward, Adit H.
AU - Balogh, Michael L.
AU - Bahe, Yannick M.
AU - Cooper, M. C.
AU - Hatch, Nina A.
AU - Marchioni, Justin
AU - Muzzin, Adam
AU - Noble, Allison
AU - Rudnick, Gregory H.
AU - Vulcani, Benedetta
AU - Wilson, Gillian
AU - De Lucia, Gabriella
AU - Demarco, Ricardo
AU - Forrest, Ben
AU - Hirschmann, Michaela
AU - Castignani, Gianluca
AU - Cerulo, Pierluigi
AU - Finn, Rose A.
AU - Hewitt, Guillaume
AU - Jablonka, Pascale
AU - Kodama, Tadayuki
AU - Maurogordato, Sophie
AU - Nantais, Julie
AU - Xie, Lizhi
N1 - Publisher Copyright:
© 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - We present an analysis of the galaxy stellar mass function (SMF) of 14 known protoclusters between 2.0 < z < 2.5 in the COSMOS field, down to a mass limit of 109.5 M. We use existing photometric redshifts with a statistical background subtraction, and consider star-forming and quiescent galaxies identified from (NUV - r) and (r - J) colours separately. Our fiducial sample includes galaxies within 1 Mpc of the cluster centres. The shape of the protocluster SMF of star-forming galaxies is indistinguishable from that of the general field at this redshift. Quiescent galaxies, however, show a flatter SMF than in the field, with an upturn at low mass, though this is only significant at ∼2σ. There is no strong evidence for a dominant population of quiescent galaxies at any mass, with a fraction <15 per cent at 1σ confidence for galaxies with log M∗/M < 10.5. We compare our results with a sample of galaxy groups at 1 < z < 1.5, and demonstrate that a significant amount of environmental quenching must take place between these epochs, increasing the relative abundance of high-mass () quiescent galaxies by a factor 2. However, we find that at lower masses (), no additional environmental quenching is required.
AB - We present an analysis of the galaxy stellar mass function (SMF) of 14 known protoclusters between 2.0 < z < 2.5 in the COSMOS field, down to a mass limit of 109.5 M. We use existing photometric redshifts with a statistical background subtraction, and consider star-forming and quiescent galaxies identified from (NUV - r) and (r - J) colours separately. Our fiducial sample includes galaxies within 1 Mpc of the cluster centres. The shape of the protocluster SMF of star-forming galaxies is indistinguishable from that of the general field at this redshift. Quiescent galaxies, however, show a flatter SMF than in the field, with an upturn at low mass, though this is only significant at ∼2σ. There is no strong evidence for a dominant population of quiescent galaxies at any mass, with a fraction <15 per cent at 1σ confidence for galaxies with log M∗/M < 10.5. We compare our results with a sample of galaxy groups at 1 < z < 1.5, and demonstrate that a significant amount of environmental quenching must take place between these epochs, increasing the relative abundance of high-mass () quiescent galaxies by a factor 2. However, we find that at lower masses (), no additional environmental quenching is required.
KW - galaxies: clusters: general
KW - galaxies: evolution
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U2 - 10.1093/mnras/stad3751
DO - 10.1093/mnras/stad3751
M3 - Article
AN - SCOPUS:85180606056
SN - 0035-8711
VL - 527
SP - 8598
EP - 8617
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -