dc.contributor.author | Dijkstra, Mark | |
dc.contributor.author | Gilfanov, Marat | |
dc.contributor.author | Loeb, Abraham | |
dc.contributor.author | Sunyaev, Rashid | |
dc.date.accessioned | 2019-09-26T15:01:29Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Dijkstra, 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.issn | 0035-8711 | |
dc.identifier.issn | 1365-2966 | |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:41412191 | * |
dc.description.abstract | Observations 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.iso | en_US | |
dc.publisher | Oxford University Press | |
dash.license | LAA | |
dc.title | Constraints on the redshift evolution of the LX-SFR relation from the cosmic X-ray backgrounds | |
dc.type | Journal Article | |
dc.description.version | Version of Record | |
dc.relation.journal | Monthly Notices of the Royal Astronomical Society | |
dash.depositing.author | Loeb, Abraham::e022a3952362350ac8a0138f128a8be7::600 | |
dc.date.available | 2019-09-26T15:01:29Z | |
dash.workflow.comments | 1Science Serial ID 66621 | |
dc.identifier.doi | 10.1111/j.1365-2966.2011.20292.x | |
dash.source.page | no-no | |