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Title: The clustering of baryonic matter. I: a halo-model approach

In this paper I generalize the halo model for the clustering of dark matter in order to produce the power spectra of the two main baryonic matter components in the Universe: stars and hot gas. As a natural extension, this can be also used to describe the clustering of all mass. According to the design of the halo model, the large-scale power spectra of the various matter components are physically connected with the distribution of each component within bound structures and thus, ultimately, with the complete set of physical processes that drive the formation of galaxies and galaxy clusters. Besides being practical for cosmological and parametric studies, the semi-analytic model presented here has also other advantages. Most importantly, it allows one to understand on physical ground what is the relative contribution of each matter component to the total clustering of mass as a function of scale, and thus it opens an interesting new window to infer the distribution of baryons through high precision cosmic shear measurements. This is particularly relevant for future wide-field photometric surveys such as Euclid. In this work the concept of the model and its uncertainties are illustrated in detail, while in a companion paper we usemore » a set of numerical hydrodynamic simulations to show a practical application and to investigate where the model itself needs to be improved.« less
Authors:
 [1]
  1. INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna (Italy)
Publication Date:
OSTI Identifier:
22373633
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; BARYONS; DESIGN; DISTRIBUTION; FUNCTIONS; GALAXIES; MASS; NONLUMINOUS MATTER; PARAMETRIC ANALYSIS; SIMULATION; SPECTRA; STARS; UNIVERSE