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http://hdl.handle.net/2289/6787
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) |
Files in This Item:
File | Description | Size | Format | |
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2017_MNRAS_472_713.pdf | Open Access | 2.13 MB | Adobe PDF | View/Open |
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