Examinando por Autor "Hatch, Nina A."

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    The stellar mass function of quiescent galaxies in 2 < z < 2.5 protoclusters
    (Oxford University Press, 2024-01) Edward, Adit H.; Balogh, Michael L.; Bahe, Yannick M.; Cooper M.C.; Hatch, Nina A.; Marchioni, Justin; Muzzin, Adam; Noble, Allison; Rudnick, Gregory H; Vulcani, Benedetta; Wilson, Gillian; De Lucia, Gabriella; Demarco, Ricardo; Forrest, Ben; Hirschmann, Michaela; Castignani, Gianluca; Cerulo, Pierluigi; Finn, Rose A.; Hewitt, Guillaume; Jablonka, Pascale; Kodama, Tadayuki; Maurogordato, Sophie; Nantais, Julie; Xie, Lizhi
    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. © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.