Analytical halo model of galactic conformity

Abstract

We present a fully analytical halo model of colour-dependent clustering that incorporates the effects of galactic conformity in a halo occupation distribution (HOD) framework. The model, based on our previous numerical work, describes conformity through a correlation between the colour of a galaxy and the concentration of its parent halo, leading to a correlation between central and satellite galaxy colours at fixed halo mass. The strength of the correlation is set by a tunable `group quenching efficiency', and the model can separately describe group-level correlations between galaxy colour (1-halo conformity) and large scale correlations induced by assembly bias (2-halo conformity). We validate our analytical results using clustering measurements in mock galaxy catalogs, finding that the model is accurate at the 10-20 percent level for a wide range of luminosities and length scales. We apply the formalism to interpret the colour-dependent clustering of galaxies in the Sloan Digital Sky Survey (SDSS). We find good overall agreement between the data and a model that has 1-halo conformity at a level consistent with previous results based on an SDSS group catalog, although the clustering data require satellites to be redder than suggested by the group catalog. Within our modelling uncertainties, however, we do not find strong evidence of 2-halo conformity driven by assembly bias in SDSS clustering.

17 pages, 11 figures, Version accepted for publication in MNRAS

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Cited by in corpus (13)

• Multi-tracer extension of the halo model: probing quenching and conformity in eBOSS
• Mapping stellar content to dark matter halos - III.Environmental dependence and conformity of galaxy colours
• The MillenniumTNG Project: Refining the one-halo model of red and blue galaxies at different redshifts
• Dependence of halo bias on mass and environment
• Group quenching and galactic conformity at low redshift
• The dependence of galaxy clustering on tidal environment in the Sloan Digital Sky Survey
• Halo models of HI selected galaxies
• Global analysis of luminosity- and colour-dependent galaxy clustering in the Sloan Digital Sky Survey
• Assembly bias evidence in close galaxy pairs
• Large scale correlations in gas traced by MgII absorbers around low mass galaxies
• Unraveling emission line galaxy conformity at z~1 with DESI early data
• The Spatial Range of Conformity
• The conformity of HI galaxies in ALFALFA-SDSS sample