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dc.contributor.authorLedlow, Michael J.eng
dc.contributor.authorLoken, Christeneng
dc.contributor.authorBurns, Jack O.eng
dc.contributor.authorOwen, Frazer N.eng
dc.contributor.authorVoges, Wolfgangeng
dc.date.issued1999-05eng
dc.description.abstractIn this Letter, we present a new determination of the local (z · 0.09) X-ray luminosity function (XLF) using a large, statistical sample of 294 Abell clusters and the ROSAT All-Sky Survey. Despite the optical selection of this catalog, we find excellent agreement with other recent determinations of the local XLF. Given our large sample size, we have reduced errors by nearly a factor of 2 for L ¸ 1043 h22 ergs s21. We combine our X(0.5-2.0 keV) 50 data with previous work to produce the most tightly constrained local determination of the XLF (over 3 orders of magnitude in LX) in order to explore possible constraints imposed by the shape of the XLF on cosmological models. A set of currently viable cosmologies is used to construct theoretical XLFs assuming L / Mp and a j8-Q0 constraint based on the local X-ray temperature function. We fit these models to our observed XLF and verify that the simplest adiabatic, analytic scaling relation disagrees strongly with observations. If we assume that clusters can be described by the preheated, constant core entropy models of Evrard & Henry, then the observed XLF is consistent only with 0.1 ! Q ! 0.4 if the energy per unit mass in galaxies is roughly equal to 0 the gas energy (i.e., if b » 1).eng
dc.description.sponsorshipThis work was supported in part by NASA grants NAG5-6739 and NAGW-3152 and NSF grant AST-9896039.eng
dc.identifier.citationThe Astrophysical Journal, 516:L53-L56, 1999 May 10eng
dc.identifier.issn1538-4357eng
dc.identifier.urihttp://hdl.handle.net/10355/5217eng
dc.publisherAmerican Astronomical Societyeng
dc.relation.ispartofPhysics and Astronomy publications (MU)eng
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. College of Arts and Sciences. Department of Physics and Astronomyeng
dc.source.urihttp://www.iop.org/EJ/article/1538-4357/516/2/L53/985566.web.pdf?request-id=e6beee5f-e720-46dd-b867-7e28e2ff9bc5eng
dc.subjectcosmologyeng
dc.subjectgalaxy clusterseng
dc.subjectX-rayseng
dc.subject.lcshX-ray astronomyeng
dc.subject.lcshGalaxies -- Observationseng
dc.subject.lcshGalaxies -- Clusterseng
dc.subject.lcshStars -- Luminosity functioneng
dc.titleThe X-Ray Luminosity Function of Nearby Rich and Poor Clusters of Galaxies:A Cosmological Probeeng
dc.typeArticleeng


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