A Halo Model with Environment Dependence: Theoretical Considerations

Abstract

We present a modification of the standard halo model with the goal of providing an improved description of galaxy clustering. Recent surveys, like the Sloan Digital Sky Survey (SDSS) and the Anglo-Australian Two-degree survey (2dF), have shown that there seems to be a correlation between the clustering of galaxies and their properties such as metallicity and star formation rate, which are believed to be environment-dependent. This environmental dependence is not included in the standard halo model where the host halo mass is the only variable specifying galaxy properties. In our approach, the halo properties i.e., the concentration, and the Halo Occupation Distribution --HOD-- prescription, will not only depend on the halo mass (like in the standard halo model) but also on the halo environment. We examine how different environmental dependence of halo concentration and HOD prescription affect the correlation function. We see that at the level of dark matter, the concentration of haloes affects moderately the dark matter correlation function only at small scales. However the galaxy correlation function is extremely sensitive to the HOD details, even when only the HOD of a small fraction of haloes is modified.

23 pages, 17 figures. Accepted for publication in MNRAS

References in corpus (6)

• Multiscale Phenomenology of the Cosmic Web
• A Halo Model of Galaxy Colors and Clustering in the SDSS
• The zCOSMOS 10k-sample: the role of galaxy stellar mass in the colour-density relation up to z=1
• Low Surface Brightness Galaxies in the SDSS: the link between environment, star-forming properties and AGN
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Cited by in corpus (13)

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• Introducing Decorated HODs: modeling assembly bias in the galaxy-halo connection
• Revealing the galaxy-halo connection in IllustrisTNG
• The halo model for cosmology: a pedagogical review
• The contributions of matter inside and outside of haloes to the matter power spectrum
• The Immitigable Nature of Assembly Bias: The Impact of Halo Definition on Assembly Bias
• How are galaxies assigned to halos? Searching for assembly bias in the SDSS galaxy clustering
• Effects of superstructure environment on galaxy groups
• Responses of Halo Occupation Distributions: a new ingredient in the halo model & the impact on galaxy bias
• The effects of halo alignment and shape on the clustering of galaxies
• Dark matter halo occupation: environment and clustering
• Using galaxy pairs to investigate the three-point correlation function in the squeezed limit
• Web-Halo Model (WHM): Accurate non-linear matter power spectrum predictions without free parameters