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|Title:||Excess entropy and energy feedback from within cluster cores up to r200||Authors:||Iqbal, Asif
Nath, Biman B.
Malik, Manzoor A.
|Issue Date:||2017||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||472||Issue:||1||First Page:||713||Abstract:||We estimate the 'non-gravitational' entropy-injection profiles, ∆K, and the resultant energy feedback profiles, ∆E, of the intracluster medium for 17 clusters using their Planck Sunyaev-Zel'dovich and ROSAT X-ray observations, spanning a large radial range from 0.2r<SUB>500</SUB> up to r<SUB>200</SUB>. The feedback profiles are estimated by comparing the observed entropy, at fixed gas mass shells, with theoretical entropy profiles predicted from non-radiative hydrodynamic simulations. We include non-thermal pressure and gas clumping in our analysis. The inclusion of non-thermal pressure and clumping results in changing the estimates for r<SUB>500</SUB> and r<SUB>200</SUB> by 10-20 per cent. When clumpiness is not considered it leads to an underestimation of ∆K ≈ 300 keV cm<SUP>2</SUP> at r<SUB>500</SUB> and ∆K ≈ 1100 keV cm<SUP>2</SUP> at r<SUB>200</SUB>. On the other hand, neglecting non-thermal pressure results in an overestimation of ∆K ≈ 100 keV cm<SUP>2</SUP> at r<SUB>500</SUB> and underestimation of ∆K ≈ 450 keV cm<SUP>2</SUP> at r<SUB>200</SUB>. For the estimated feedback energy, we find that ignoring clumping leads to an underestimation of energy per particle ∆E ≈ 1 keV at r<SUB>500</SUB> and ∆E ≈ 1.5 keV at r<SUB>200</SUB>. Similarly, neglect of the non-thermal pressure results in an overestimation of ∆E ≈ 0.5 keV at r<SUB>500</SUB> and underestimation of ∆E ≈ 0.25 keV at r<SUB>200</SUB>. We find entropy floor of ∆K ≈ 300 keV cm<SUP>2</SUP> is ruled out at ≈3σ throughout the entire radial range and ∆E ≈ 1 keV at more than 3σ beyond r<SUB>500</SUB>, strongly constraining intracluster medium pre-heating scenarios. We also demonstrate robustness of results w.r.t. sample selection, X-ray analysis procedures, entropy modelling, etc. <P />||URI:||http://hdl.handle.net/20.500.12386/26528||URL:||https://academic.oup.com/mnras/article/472/1/713/4064383||ISSN:||0035-8711||DOI:||10.1093/mnras/stx1999||Bibcode ADS:||2017MNRAS.472..713I||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Sep 24, 2020
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