On the origin of metallicity in Lyman-alpha forest systems

Chiba, Masashi; Nath, Biman B.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2519

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DC Field	Value	Language
dc.contributor.author	Chiba, Masashi	-
dc.contributor.author	Nath, Biman B.	-
dc.date.accessioned	2007-05-29T06:29:52Z	-
dc.date.available	2007-05-29T06:29:52Z	-
dc.date.issued	2002	-
dc.identifier.citation	IAU Symposium, 2002, Vol.187, p123-127	en
dc.identifier.isbn	1-4020-0448-6	-
dc.identifier.uri	http://hdl.handle.net/2289/2519	-
dc.description	Restricted Access. Cosmic chemical evolution. Proceedings of the 187th Symposium of the International Astronomical Union, held at Kyoto, Japan, 26-30 August 1997. Eds. K. Nomoto and J. W. Truran. Dordrecht: Kluwer Academic Publishers, 2002.	en
dc.description.abstract	In the hierarchical model of structure formation, there is a continuum of halos of various masses and velocity dispersions. In this contribution, we consider the hypothesis that the Lyα absorption lines are produced in two populations of halos in this continuum - in "minihalos" of small velocity dispersions that have never cooled and formed stars, and in large galactic halos with stars and metals. Based on this two-population model for Lyα absorbers, together with chemical history of galactic halos, we investigate whether or not the fraction fm, of Lyα lines associated with metal lines, is understood in terms of fg by the relationship fm ~= fg. If fm is larger than fg, it may be concluded that the intergalactic medium (IGM) experienced a global enrichment at higher z.	en
dc.format.extent	155813 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Kluwer	en
dc.relation.uri	http://adsabs.harvard.edu/cgi-bin/bib_query?2002IAUS..187..123C	en
dc.rights	2002 Kluwer	en
dc.subject	Intergalactic Mater	en
dc.subject	Lyman-Alpha Forest	en
dc.subject	Metallicity	en
dc.title	On the origin of metallicity in Lyman-alpha forest systems	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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