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dc.contributor.authorVoss, R.
dc.contributor.authorGilfanov, M.
dc.contributor.authorSivakoff, G.R.
dc.contributor.authorKraft, R.P.
dc.contributor.authorJordan, A.
dc.contributor.authorRaychaudhury, S.
dc.contributor.authorBirkinshaw, M.
dc.contributor.authorBrassington, Nicola
dc.contributor.authorCroston, J.H.
dc.contributor.authorEvans, D.A.
dc.contributor.authorForman, W.R.
dc.contributor.authorHardcastle, M.J.
dc.contributor.authorHarris, W.E.
dc.contributor.authorJones, C.
dc.contributor.authorJuett, A.M.
dc.contributor.authorMurray, S.S.
dc.contributor.authorSarazin, C.L.
dc.contributor.authorWoodley, K.A.
dc.contributor.authorWorrall, D.M.
dc.date.accessioned2011-12-14T15:01:17Z
dc.date.available2011-12-14T15:01:17Z
dc.date.issued2009
dc.identifier.citationVoss , R , Gilfanov , M , Sivakoff , G R , Kraft , R P , Jordan , A , Raychaudhury , S , Birkinshaw , M , Brassington , N , Croston , J H , Evans , D A , Forman , W R , Hardcastle , M J , Harris , W E , Jones , C , Juett , A M , Murray , S S , Sarazin , C L , Woodley , K A & Worrall , D M 2009 , ' Luminosity functions of LMXBs in Centaurus A: globular clusters versus the field ' , The Astrophysical Journal , vol. 701 , no. 1 , pp. 471-480 . https://doi.org/10.1088/0004-637X/701/1/471
dc.identifier.issn0004-637X
dc.identifier.otherdspace: 2299/3769
dc.identifier.otherORCID: /0000-0003-4223-1117/work/30391041
dc.identifier.urihttp://hdl.handle.net/2299/7268
dc.descriptionOriginal article can be found at: http://www.iop.org/EJ/journal/apj Copyright American Astronomical Society. DOI: 10.1088/0004-637X/701/1/471 [Full text of this article is not available in the UHRA]
dc.description.abstractWe study the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXB) in the nearby early-type galaxy Centaurus A, concentrating primarily on two aspects of binary populations: the XLF behavior at the low-luminosity limit and the comparison between globular cluster and field sources. The 800 ksec exposure of the deep Chandra VLP program allows us to reach a limiting luminosity of ~8 × 1035 erg s–1, about ~2-3 times deeper than previous investigations. We confirm the presence of the low-luminosity break of the overall LMXB XLF at log(LX ) 37.2-37.6, below which the luminosity distribution follows a dN/d(ln L) ~ const law. Separating globular cluster and field sources, we find a statistically significant difference between the two luminosity distributions with a relative underabundance of faint sources in the globular cluster population. This demonstrates that the samples are drawn from distinct parent populations and may disprove the hypothesis that the entire LMXB population in early-type galaxies is created dynamically in globular clusters. As a plausible explanation for this difference in the XLFs, we suggest an enhanced fraction of helium-accreting systems in globular clusters, which are created in collisions between red giants and neutron stars. Due to the four times higher ionization temperature of He, such systems are subject to accretion disk instabilities at 20 times higher mass accretion rate and, therefore, are not observed as persistent sources at low luminosities.en
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.titleLuminosity functions of LMXBs in Centaurus A: globular clusters versus the fielden
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSPECS Deans Group
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionofrecord10.1088/0004-637X/701/1/471
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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