Dwarf galaxies and the origin of the intracluster medium

Nath, Biman B.; Chiba, Masashi

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4443

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DC Field	Value	Language
dc.contributor.author	Nath, Biman B.	-
dc.contributor.author	Chiba, Masashi	-
dc.date.accessioned	2012-05-07T08:40:01Z	-
dc.date.available	2012-05-07T08:40:01Z	-
dc.date.issued	1995-12	-
dc.identifier.citation	Astrophysical Journal, 19954, Vol. 454, p604	en
dc.identifier.issn	0004-637X	-
dc.identifier.issn	1538-4357 (Online)	-
dc.identifier.uri	http://hdl.handle.net/2289/4443	-
dc.description	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)	en
dc.description.abstract	Following the recent suggestion that it is dwarf galaxies in clusters as opposed to large ellipticals that provide the intracluster gas, we estimate the metallicity of the intracluster medium in such a case. We derive analytical expressions for the fraction of mass of dwarf galaxies that is ejected and estimate the metallicity of the resulting intracluster gas. We find that the metallicity resulting from this hypothesis is adequate only for clusters with low-metallicity gas. Since galactic winds from dwarf galaxies occur much earlier than those from ellipticals, because of the smaller binding energy of the gas, we show that the gas ejected by dwarf galaxies is enriched mostly by Type II supernovae, as opposed to Type I supernovae in the case of large galaxies. We further point out that the gas in small-scale structures, which never cools and forms stars owing to low temperatures and, consequently, a large cooling timescale, gets dispersed in the process of hierarchical clustering and is incorporated as the diffuse intracluster gas. We show that this process can provide enough hot gas to be compatible with X-ray observations in rich clusters.	en
dc.language.iso	en	en
dc.publisher	American Astronomical Society	en
dc.relation.uri	http://adsabs.harvard.edu/abs/1995ApJ...454..604N	en
dc.relation.uri	http://arxiv.org/abs/astro-ph/9505081	en
dc.relation.uri	http://dx.doi.org/ 10.1086/176514	en
dc.rights	1995 The American Astronomical Society	en
dc.subject	galaxies: abundances	en
dc.subject	galaxies: intergalactic medium	en
dc.subject	galaxies: evolution	en
dc.subject	galaxies: clusters	en
dc.subject	supernovae	en
dc.title	Dwarf galaxies and the origin of the intracluster medium	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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