A semi-analytical perspective on massive galaxies at z ∼ 0.55

ABSTRACT The most massive and luminous galaxies in the Universe serve as powerful probes to study the formation of structure, the assembly of mass, and cosmology. However, their detailed formation and evolution is still barely understood. Here we extract a sample of massive mock galaxies from the se...

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Published in:Monthly notices of the Royal Astronomical Society 2019-06, Vol.486 (1), p.1316-1331
Main Authors: Stoppacher, D, Prada, F, Montero-Dorta, A D, Rodríguez-Torres, S, Knebe, A, Favole, G, Cui, W, Benson, A J, Behrens, C, Klypin, A A
Format: Article
Language:English
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Summary:ABSTRACT The most massive and luminous galaxies in the Universe serve as powerful probes to study the formation of structure, the assembly of mass, and cosmology. However, their detailed formation and evolution is still barely understood. Here we extract a sample of massive mock galaxies from the semi-analytical model of galaxy formation (SAM) galacticus from the MultiDark-Galaxies by replicating the CMASS photometric selection from the SDSS-iii Baryon Oscillation Spectroscopic Survey (BOSS). The comparison of the galacticus CMASS-mock with BOSS–CMASS data allows us to explore different aspects of the massive galaxy population at 0.5 < z < 0.6, including the galaxy–halo connection and the galaxy clustering. We find good agreement between our modelled galaxies and observations regarding the galaxy–halo connection, but our CMASS-mock overestimates the clustering amplitude of the two-point correlation function due to a smaller number density compared to BOSS, a lack of blue objects, and a small intrinsic scatter in stellar mass at fixed halo mass of
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stz797