A modelindependent test of the evolution of gas depletion factor for SPTSZ and Planck ESZ clusters
Bora, Kamal and Desai, Shantanu (2021) A modelindependent test of the evolution of gas depletion factor for SPTSZ and Planck ESZ clusters. The European Physical Journal C, 81 (4). ISSN 14346044
Full text not available from this repository. (Request a copy)Abstract
The gas mass fraction in galaxy clusters has been widely used to determine cosmological parameters. This method assumes that the ratio of the cluster gas mass fraction to the cosmic baryon fraction (γ(z)) is constant as a function of redshift. In this work, we look for a time evolution of γ(z) at R500 by using both the SPTSZ and Planck Early SZ (ESZ) cluster data, in a modelindependent fashion without any explicit dependence on the underlying cosmology. For this calculation, we use a nonparametric functional form for the Hubble parameter obtained from Gaussian Process regression using cosmic chronometers. We parameterize γ(z) as: γ(z) = γ(1 + γ1z) to constrain the redshift evolution. We find contradictory results between both the samples. For SPTSZ, γ(z) decreases as a function of redshift (at more than 5σ), whereas a positive trend with redshift is found for Planck ESZ data (at more than 4σ). We however find that the γ1 values for a subset of SPTSZ and Planck ESZ clusters between the same redshift interval agree to within 1 σ. When we allow for a dependence on the halo mass in the evolution of the gas depletion factor, the 4  5 σ discrepancy reduces to 2 σ.
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Item Type:  Article  
Uncontrolled Keywords:  Galaxies, SunyaevZeldovich effect, XMMnewton Telescope  
Subjects:  Computer science Physics Physics > Astronomy Astrophysics 

Divisions:  Department of Physics  
Depositing User:  . LibTrainee 2021  
Date Deposited:  29 May 2021 10:12  
Last Modified:  29 May 2021 10:12  
URI:  http://raiith.iith.ac.in/id/eprint/7879  
Publisher URL:  http://doi.org/10.1140/epjc/s10052021090994  
OA policy:  https://v2.sherpa.ac.uk/id/publication/11219  
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