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The environmental effects of the LSS : characterization of the baryonic components

Abstract : The baryonic component of the Large Scale Structure (LSS) of the Universe is composed by concentrations of gas and galaxies forming groups, clusters, elongated filaments and widely spread sheets which probably underline the distribution of dark matter. Nevertheless, according to the current cosmological models, most of the baryonic material in the Universe has not yet been directly observed. Numerical simulations suggest that from one-half to two-thirds of all baryons may be located out of clusters of galaxies, pervading the structures between them. The most concentrated structures, which we call systems of galaxies (i.e., groups and clusters) usually contain high density hot gas (1 - 10 keV) that cools radiatively, emits at X-rays wavelengths and interacts with the cosmic microwave background at millimeter wavelengths (Sunyaev Zel'dovich effect, SZ). For the less dense structures, filaments and sheets, the baryons are probably in moderately hot gas phase (0.01 - 1 keV), commonly named as warm hot intergalactic medium (WHIM). In this PhD Thesis, we study the environmental effects associated to the different components of the LSS. For the galaxy systems, we aim to characterize the intra cluster medium (ICM) through the analysis of the S-Z effect. We employ the ACT and Planck data to analyze the gas pressure profiles of a sample of low mass galaxy clusters. For the least dense structures, we assembled a sample of filament candidates composed by chains of clusters that are located inside superclusters of galaxies. We aim to probe the filament structure skeletons and characterize their components (galaxies, groups/clusters and gas).
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Submitted on : Thursday, November 26, 2020 - 4:23:32 PM
Last modification on : Friday, November 27, 2020 - 3:29:25 AM


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  • HAL Id : tel-03026364, version 1



Iris del Carmen Santiago Bautista. The environmental effects of the LSS : characterization of the baryonic components. Astrophysics [astro-ph]. Université Paul Sabatier - Toulouse III; Universidad de Guanajuato (México), 2020. English. ⟨NNT : 2020TOU30034⟩. ⟨tel-03026364⟩



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