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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6654
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dc.contributor.authorIqbal, Asif-
dc.contributor.authorMajumdar, Subhabrata-
dc.contributor.authorNath, Biman B.-
dc.contributor.authorEttori, Stefano-
dc.contributor.authorEckert, Dominique-
dc.contributor.authorMalik, Manzoor A-
dc.date.accessioned2017-05-24T05:57:44Z-
dc.date.available2017-05-24T05:57:44Z-
dc.date.issued2017-02-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society Letters , 2017, Vol. 465, L99-L103en_US
dc.identifier.issn0035-8711-
dc.identifier.issn1365-2966 - (online)-
dc.identifier.urihttp://hdl.handle.net/2289/6654-
dc.descriptionOpen Accessen_US
dc.description.abstractNon-gravitational feedback affects the nature of the intracluster medium (ICM). X-ray cooling of the ICM and in situ energy feedback from active galactic nuclei (AGNs) and supernovae as well as pre-heating of the gas at epochs preceding the formation of clusters are proposed mechanisms for such feedback. While cooling and AGN feedbacks are dominant in cluster cores, the signatures of a pre-heated ICM are expected to be present even at large radii. To estimate the degree of pre-heating, with minimum confusion from AGN feedback/cooling, we study the excess entropy and non-gravitational energy profiles up to r200 for a sample of 17 galaxy clusters using joint data sets of Planck Sunyaev–Zel'dovich pressure and ROSAT/Position Sensitive Proportional Counter gas density profiles. The canonical value of pre-heating entropy floor of ≳300 keV cm2, needed in order to match cluster scalings, is ruled out at ≈3σ. We also show that the feedback energy of 1 keV particle−1 is ruled out at 5.2σ beyond r500. Our analysis takes both non-thermal pressure and clumping into account which can be important in outer regions. Our results based on the direct probe of the ICM in the outermost regions do not support any significant pre-heating.en_US
dc.language.isoenen_US
dc.publisherOxford University Press for the Royal Astronomical Societyen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2017MNRAS.465L..99Ien_US
dc.relation.urihttp://arxiv.org/abs/1606.00014en_US
dc.relation.urihttp://dx.doi.org/10.1093/mnrasl/slw220en_US
dc.rights2016 The authors & the Royal Astronomical Societyen_US
dc.subjectGalaxies: clustersen_US
dc.subjectIntracluster mediumen_US
dc.subjectCosmological parametersen_US
dc.titleLittle evidence for entropy and energy excess beyond r500 - an end to ICM pre-heating?en_US
dc.typeArticleen_US
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