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dc.contributor.authorBrassington, Nicola
dc.contributor.authorFabbiano, G.
dc.contributor.authorZezas, A.
dc.contributor.authorKim, D.-W.
dc.contributor.authorFragos, T.
dc.contributor.authorKundu, A.
dc.contributor.authorKing, A.R.
dc.contributor.authorPellegrini, S.
dc.contributor.authorTrinchieri, G.
dc.contributor.authorZepf, S.
dc.contributor.authorWright, N.J.
dc.date.accessioned2012-11-26T13:00:01Z
dc.date.available2012-11-26T13:00:01Z
dc.date.issued2012-08-20
dc.identifier.citationBrassington , N , Fabbiano , G , Zezas , A , Kim , D-W , Fragos , T , Kundu , A , King , A R , Pellegrini , S , Trinchieri , G , Zepf , S & Wright , N J 2012 , ' The Spectral and Temporal Properties of Transient Sources in Early-type Galaxies ' , The Astrophysical Journal , vol. 755 , no. 2 , 162 . https://doi.org/10.1088/0004-637X/755/2/162
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 1267667
dc.identifier.otherPURE UUID: 40a040d2-fcec-4456-af38-1c36486cb3cb
dc.identifier.otherScopus: 84864694972
dc.identifier.urihttp://hdl.handle.net/2299/9230
dc.descriptionCopyright 2012 Elsevier B.V., All rights reserved.
dc.description.abstractWe report the spectral and temporal variability properties of 18 candidate transient (TC) and potential transient (PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC3379, NGC4278, and NGC4697. Only one source can be identified with a background counterpart, leaving 17 TCs + PTCs in the galaxies. Of these, 14 are in the galaxy field, supporting the theoretical picture that the majority of field X-ray binaries (XRBs) will exhibit transient accretion for >75% of their lifetime. Three sources are coincident with globular clusters, including two high-luminosity candidate black hole (BH) XRBs, with Lx= 5.4 × 10 erg/s and Lx= 2.8 × 10 erg/s, respectively. The spectra, luminosities, and temporal behavior of these 17 sources suggest that the transient population is heterogeneous, including neutron star (NS) and BH XRBs in both normal and high-rate accretion modes, and super soft sources containing white dwarf binaries. Our TC and PTC detections are noticeably fewer than the number expected from the population synthesis (PS) models of Fragos et al., tailored to our new Chandra pointings of NGC4278. We attribute this discrepancy to the PS assumption that the transient population is composed of NS XRBs, as well as differences between the statistical analysis and error estimates used in the model and our observationsen
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.rightsOpen
dc.titleThe Spectral and Temporal Properties of Transient Sources in Early-type Galaxiesen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2012-08-20
rioxxterms.versionAM
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-637X/755/2/162
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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