On cooling flows and the Sunyaev-Zeldovich effect

Majumdar, Subhabrata; Nath, Biman B.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1439

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DC Field	Value	Language
dc.contributor.author	Majumdar, Subhabrata	-
dc.contributor.author	Nath, Biman B.	-
dc.date.accessioned	2006-07-13T06:46:13Z	-
dc.date.available	2006-07-13T06:46:13Z	-
dc.date.issued	2000-10-20	-
dc.identifier.citation	Astrophysical Journal, 2000, Vol.542, p597-607	en
dc.identifier.issn	0004-637X	-
dc.identifier.issn	1538-4357(Online)	-
dc.identifier.uri	http://hdl.handle.net/2289/1439	-
dc.description.abstract	We study the effect of cooling flows in galaxy clusters on the Sunyaev-Zeldovich (SZ) distortion and the possible cosmological implications. The SZ effect, along with X-ray observations of clusters, is used to determine the Hubble constant, H0. Blank-sky surveys of SZ effect are being planned to constrain the geometry of the universe through cluster counts. It is also known that a significant fraction of clusters have cooling flows in them, which change the pressure profile of intracluster gas. Since the SZ decrement depends essentially on the pressure profile, it is important to study possible changes in the determination of cosmological parameters in the presence of a cooling flow. We build several representative models of cooling flows and compare the results with the corresponding case of gas in hydrostatic equilibrium. We find that cooling flows can lead to an overestimation of the Hubble constant. Specifically, we find that for realistic models of cooling flow with mass deposition (varying m with radius), there is of the order of ~10% deviation in the estimated value of the Hubble constant (from that for gas without a cooling flow) even after excluding ~80% of the cooling-flow region from the analysis. We also discuss the implications of using cluster counts from SZ observations to constrain other cosmological parameters in the presence of clusters with cooling flows.	en
dc.format.extent	235247 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	The University of Chicago Press for the American Astronomical Society	en
dc.relation.uri	http://dx.doi.org/10.1086/317039	en
dc.rights	(2000) by the American Astronomical Society.	en
dc.subject	Galaxies: Cooling Flows,	en
dc.subject	Cosmology: Cosmic Microwave Background,	en
dc.subject	Cosmology: Distance Scale	en
dc.subject	Galaxies: Clusters: General,	en
dc.subject	Cosmology: Large-Scale Structure of Universe	en
dc.title	On cooling flows and the Sunyaev-Zeldovich effect	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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