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dc.contributor.authorIvanova, Natalia
dc.contributor.authorFragos, Tassos
dc.contributor.authorKim, Dong-Woo
dc.contributor.authorFabbiano, Guiseppina
dc.contributor.authorAvendano Nandez, Jose Luis
dc.contributor.authorLombardi, James C. Jr
dc.contributor.authorSivakoff, Gregory R.
dc.contributor.authorVoss, Rasmus
dc.contributor.authorJordán, Andrés
dc.date.accessioned2018-01-25T20:15:09Z
dc.date.available2018-01-25T20:15:09Z
dc.date.issued2012-12-01
dc.identifier.citationIvanova, N., et al. (2012). On the origin of the metallicity dependence in dynamically formed extragalactic low-mass X-ray binaries. The Astrophysical Journal 760(L24): 1-4. doi: 10.1088/2041-8205/760/2/L24en_US
dc.identifier.issn0004-637X
dc.identifier.issne1538-4357
dc.identifier.urihttp://hdl.handle.net/10456/45546
dc.description.abstractGlobular clusters (GCs) effectively produce dynamically formed low-mass X-ray binaries (LMXBs). Observers detect ~100 times more LMXBs per stellar mass in GCs compared to stars in the fields of galaxies. Observationally, metal-rich GCs are about three times more likely to contain an X-ray source than their metal-poor counterparts. Recent observations have shown that this ratio holds in extragalactic GCs for all bright X-ray sources with L X between 2 × 1037 and 5 × 1038 erg s–1. In this Letter, we propose that the observed metallicity dependence of LMXBs in extragalactic GCs can be explained by the differences in the number densities and average masses of red giants in populations of different metallicities. Red giants serve as seeds for the dynamical production of bright LMXBs via two channels—binary exchanges and physical collisions—and the increase of the number densities and masses of red giants boost LMXB production, leading to the observed difference. We also discuss a possible effect of the age difference in stellar populations of different metallicities.en_US
dc.language.isoen_USen_US
dc.publisherInstitute of Physicsen_US
dc.relation.ispartofThe Astrophysical Journalen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/2041-8205/760/2/L24en_US
dc.rightsThis article has been accepted for publication in the Astrophysical Journal © 2012 Ivanova, et al. Published by Institute of Physics. All rights reserved.en_US
dc.subjectbinaries: closeen_US
dc.subjectglobular clusters: generalen_US
dc.subjectX-rays: binariesen_US
dc.titleOn the origin of the metallicity dependence in dynamically formed extragalactic low-mass X-ray binariesen_US
dc.description.versionPublished articleen_US
dc.contributor.departmentPhysicsen_US
dc.citation.volume760en_US
dc.citation.issueL24en_US
dc.citation.spage1en_US
dc.citation.epage4en_US
dc.identifier.doi10.1088/2041-8205/760/2/L24
dc.contributor.avlauthorLombardi, James C. Jr


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