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dc.contributor.authorDijkstra, Mark
dc.contributor.authorGilfanov, Marat
dc.contributor.authorLoeb, Abraham
dc.contributor.authorSunyaev, Rashid
dc.date.accessioned2019-09-26T15:01:29Z
dc.date.issued2012
dc.identifier.citationDijkstra, Mark, Marat Gilfanov, Abraham Loeb, and Rashid Sunyaev. 2012. “Constraints on the Redshift Evolution of the LX-SFR Relation from the Cosmic X-Ray Backgrounds.” Monthly Notices of the Royal Astronomical Society, January, no-no. https://doi.org/10.1111/j.1365-2966.2011.20292.x.
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41412191*
dc.description.abstractObservations of local star-forming galaxies have revealed a correlation between the rate at which galaxies form stars and their X-ray luminosity. We combine this correlation with the most recent observational constraints on the integrated star formation rate (SFR) density and find that star-forming galaxies account for 5-20 per cent of the total soft and hard X-ray backgrounds, where the precise number depends on the energy band and the assumed average X-ray spectral energy distribution of the galaxies below similar to 20 keV. If we combine the L-X-SFR relation with recently derived SFR function, then we find that star-forming galaxies whose X-ray flux falls well (more than a factor of 10) below the detection thresholds of the Chandra Deep Fields can fully account for the unresolved soft X-ray background, which corresponds to similar to 6 per cent of its total. Motivated by this result, we put limits on the allowed redshift evolution of the parameter c(X) = L-X/SFR and/or its evolution towards lower and higher SFRs. If we parametrize the redshift evolution of c(X) proportional to (1 + z)(b), then we find that b <= 1.3 (95 per cent confidence level). On the other hand, the observed X-ray luminosity functions of star-forming galaxies indicate that c(X) may be increasing towards higher redshifts and/or higher SFRs at levels that are consistent with the X-ray background, but possibly at odds with the locally observed L-X-SFR relation.
dc.language.isoen_US
dc.publisherOxford University Press
dash.licenseLAA
dc.titleConstraints on the redshift evolution of the LX-SFR relation from the cosmic X-ray backgrounds
dc.typeJournal Article
dc.description.versionVersion of Record
dc.relation.journalMonthly Notices of the Royal Astronomical Society
dash.depositing.authorLoeb, Abraham::e022a3952362350ac8a0138f128a8be7::600
dc.date.available2019-09-26T15:01:29Z
dash.workflow.comments1Science Serial ID 66621
dc.identifier.doi10.1111/j.1365-2966.2011.20292.x
dash.source.pageno-no


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