Connecting massive galaxies to dark matter haloes in BOSS - I. Is galaxy colour a stochastic process in high-mass haloes?

Shun Saito, Alexie Leauthaud, Andrew P. Hearin, Kevin Bundy, Andrew R. Zentner, Peter S. Behroozi, Beth A. Reid, Manodeep Sinha, Jean Coupon, Jeremy L. Tinker, Martin White, Donald P. Schneider

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

We use subhalo abundance matching (SHAM) to model the stellar mass function (SMF) and clustering of the Baryon Oscillation Spectroscopic Survey (BOSS) 'CMASS' sample at z ~ 0.5. We introduce a novel method which accounts for the stellar mass incompleteness of CMASS as a function of redshift, and produce CMASS mock catalogues which include selection effects, reproduce the overall SMF, the projected two-point correlation function wp, the CMASS dn/dz, and are made publicly available. We study the effects of assembly bias above collapse mass in the context of 'age matching' and show that these effects are markedly different compared to the ones explored by Hearin et al. at lower stellar masses. We construct two models, one in which galaxy colour is stochastic ('AbM' model) as well as a model which contains assembly bias effects ('AgM' model). By confronting the redshift dependent clustering of CMASS with the predictions from our model, we argue that that galaxy colours are not a stochastic process in high-mass haloes. Our results suggest that the colours of galaxies in high-mass haloes are determined by other halo properties besides halo peak velocity and that assembly bias effects play an important role in determining the clustering properties of this sample.

Original languageEnglish (US)
Pages (from-to)1457-1475
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume460
Issue number2
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Saito, S., Leauthaud, A., Hearin, A. P., Bundy, K., Zentner, A. R., Behroozi, P. S., Reid, B. A., Sinha, M., Coupon, J., Tinker, J. L., White, M., & Schneider, D. P. (2016). Connecting massive galaxies to dark matter haloes in BOSS - I. Is galaxy colour a stochastic process in high-mass haloes? Monthly Notices of the Royal Astronomical Society, 460(2), 1457-1475. https://doi.org/10.1093/mnras/stw1080