A halo model of galaxy colours and clustering in the Sloan Digital Sky Survey
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Successful halo-model descriptions of the luminosity dependence of clustering distinguish between the central galaxy in a halo and all the others (satellites). To include colours, we provide a prescription for how the colour–magnitude relation of centrals and satellites depends on halo mass. This follows from two assumptions: (i) the bimodality of the colour distribution at a fixed luminosity is independent of halo mass and (ii) the fraction of satellite galaxies which populate the red sequence increases with luminosity. We show that these two assumptions allow one to build a model of how galaxy clustering depends on colour without any additional free parameters than those required to model the luminosity dependence of galaxy clustering. We then show that the resulting model is in good agreement with the distribution and clustering of colours in the Sloan Digital Sky Survey, both by comparing the predicted correlation functions of red and blue galaxies with measurements and by comparing the predicted colour–mark correlation function with the measured one. Mark correlation functions are powerful tools for identifying and quantifying correlations between galaxy properties and their environments: our results indicate that the correlation between halo mass and environment is the primary driver for correlations between galaxy colours and the environment; additional correlations associated with halo ‘assembly bias’ are relatively small. Our approach shows explicitly how to construct mock catalogues which include both luminosities and colours – thus providing realistic training sets for, e.g., galaxy cluster-finding algorithms. Our prescription is the first step towards incorporating the entire spectral energy distribution into the halo model approach.
Subfields: Astronomy and Astrophysics, Ecology, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/b8c3cb39bc818f58bede366c10baadf1330b722d
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Citations in the corpus
- Galaxy Zoo: Disentangling the Environmental Dependence of Morphology and Colour ⋆ (2008, methodology): “In addition, we have performed tests with similar catalogs with different minimum redshifts, and have also compared some measurements to those of Skibba & Sheth (2008), in which fiber-collided galaxies were included and were given the redshift of their nearest neighbour; in both cases, the…”
- Galaxy assembly bias: a significant source of systematic error in the galaxy–halo relationship (2013, background): “…includes Magliocchetti & Porciani 2003; Zehavi et al. 2005; Yang et al. 2005; Zheng et al. 2007; van den Bosch et al. 2007; Zheng et al. 2009; Skibba & Sheth 2009; Simon et al. 2009; Ross et al. 2010; Zehavi et al. 2011; Geach et al. 2012; Parejko et al. 2013) as well as cosmology (Tinker et…”
- Are Brightest Halo Galaxies Central Galaxies (2010, background): “…Skibba 2009; Hansen et al. 2009) and halo model analyses of galaxy clustering (e.g., Skibba et al. 2006; Cooray 2006; van den Bosch et al. 2007; Skibba & Sheth 2009) have explicitly shown that central galaxies are indeed a distinct population and exhibit different properties (e.g., colour,…”
- The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: mock galaxy catalogues for the BOSS Final Data Release (2015, methodology): “…methods connecting haloes to galaxies like the HOD model, which we are not going to consider here (e.g. Berlind & Weinberg 2002; Kravtsov et al. 2004; Zehavi et al. 2005; Zentner et al. 2005; Zheng, Coil & Zehavi 2007; Ross & Brunner 2009; Skibba & Sheth 2009; Zheng et al. 2009; White et al. 2011).”