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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4154
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dc.contributor.authorVasiliev, Evgenii O.-
dc.contributor.authorSethi, S.K.-
dc.contributor.authorNath, Biman B.-
dc.date.accessioned2011-08-27T07:39:00Z-
dc.date.available2011-08-27T07:39:00Z-
dc.date.issued2011-01-
dc.identifier.citationAstrophysics and Space Science, 2011, Vol.335, p211en
dc.identifier.issn0004-640X-
dc.identifier.issn1572-946X (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/4154-
dc.descriptionRestricted Access.en
dc.description.abstractUsing nonequilibrium calculations of the ionic states and the recently calculated extragalactic ultraviolet background radiation with absorption by intergalactic HeII we determine the ratios of CIII to CIV expected at z ∼ 2–3, as functions of metallicity, gas density and temperature. We constrain the spectrum of the extragalactic ultraviolet background radiation by fitting the observed abundance ratios carbon ions at these redshifts with those expected from different models of the background radiation. Our analysis of the observed ratios shows that ‘delayed reionization’ models, which assume a large fraction of HeII at z ∼ 3, is not favored by data. Our results suggest that HeII reionization was inhomogeneous, consistent with the predictions from recent simulations.en
dc.language.isoenen
dc.publisherSpringeren
dc.relation.urihttp://adsabs.harvard.edu/doi/10.1007/s10509-010-0585-6en
dc.relation.urihttp://dx.doi.org/10.1007/s10509-010-0585-6en
dc.rights2011 Springer.en
dc.subjectCosmology: theoryen
dc.subjectDiffuse radiationen
dc.subjectIntergalatic mediumen
dc.subjectQuasars: generalen
dc.titleNonequilibrium carbon ionization states and the extragalactic far-UV background with He2 absorptionen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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