Title:	Excess entropy and energy feedback from within cluster cores up to r200
Authors:	Iqbal, Asif Majumdar, Subhabrata Nath, Biman B. Ettori, Stefano Eckert, Dominique Malik, Manzoor A
Keywords:	glaxies clusters intracluster medium cosmological parameters
Issue Date:	Nov-2017
Publisher:	Oxford University Press for the Royal Astronomical Society
Citation:	Monthly Notices of the Royal Astronomical Society, 2017, Vol. 472, P713-726
Abstract:	We estimate the ‘non-gravitational’ entropy-injection profiles, ΔK, and the resultant energy feedback profiles, ΔE, of the intracluster medium for 17 clusters using their Planck Sunyaev–Zel'dovich and ROSAT X-ray observations, spanning a large radial range from 0.2r500 up to r200. 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 r500 and r200 by 10–20 per cent. When clumpiness is not considered it leads to an underestimation of ΔK ≈ 300 keV cm2 at r500 and ΔK ≈ 1100 keV cm2 at r200. On the other hand, neglecting non-thermal pressure results in an overestimation of ΔK ≈ 100 keV cm2 at r500 and underestimation of ΔK ≈ 450 keV cm2 at r200. For the estimated feedback energy, we find that ignoring clumping leads to an underestimation of energy per particle ΔE ≈ 1 keV at r500 and ΔE ≈ 1.5 keV at r200. Similarly, neglect of the non-thermal pressure results in an overestimation of ΔE ≈ 0.5 keV at r500 and underestimation of ΔE ≈ 0.25 keV at r200. We find entropy floor of ΔK ≈ 300 keV cm2 is ruled out at ≈3σ throughout the entire radial range and ΔE ≈ 1 keV at more than 3σ beyond r500, 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.
Description:	Open Access
URI:	http://hdl.handle.net/2289/6787
ISSN:	0035-8711 1365-2966 - (online)
Alternative Location:	http://adsabs.harvard.edu/abs/2017MNRAS.472..713I https://arxiv.org/abs/1703.00028 http://dx.doi.org/10.1093/mnras/stx1999
Copyright:	2017 The authors & the Royal Astronomical Society
Appears in Collections:	Research Papers (A&A)

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