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dc.contributor.authorAnderson, G.E.
dc.contributor.authorGaensler, B.M.
dc.contributor.authorKaplan, D.L.
dc.contributor.authorPosselt, B.
dc.contributor.authorSlane, P.O.
dc.contributor.authorMauerhan, J.C.
dc.contributor.authorBenjamin, R.A.
dc.contributor.authorBrogan, C.L.
dc.contributor.authorChakrabarty, D.
dc.contributor.authorDrake, J.
dc.contributor.authorDrew, J.E.
dc.contributor.authorGrindlay, J.E.
dc.contributor.authorHong, J.
dc.contributor.authorLazio, T.J.W.
dc.contributor.authorLee, J.C.
dc.contributor.authorSteeghs, D.
dc.contributor.authorVan Kerkwijk, M.H.
dc.date.accessioned2011-03-16T13:30:26Z
dc.date.available2011-03-16T13:30:26Z
dc.date.issued2011
dc.identifier.citationAnderson , G E , Gaensler , B M , Kaplan , D L , Posselt , B , Slane , P O , Mauerhan , J C , Benjamin , R A , Brogan , C L , Chakrabarty , D , Drake , J , Drew , J E , Grindlay , J E , Hong , J , Lazio , T J W , Lee , J C , Steeghs , D & Van Kerkwijk , M H 2011 , ' Identification of a population of X-ray-emitting massive stars in the Galactic plane ' , The Astrophysical Journal , vol. 727 , no. 2 , pp. 105-117 . https://doi.org/10.1088/0004-637X/727/2/105
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 158358
dc.identifier.otherPURE UUID: 88d96b9e-38c6-4e20-b0f1-d49096648c49
dc.identifier.otherdspace: 2299/5484
dc.identifier.otherScopus: 84891171833
dc.identifier.urihttp://hdl.handle.net/2299/5484
dc.description‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at: http://iopscience.iop.org/ Copyright American Astronomical Society
dc.description.abstractWe present X-ray, infrared, optical, and radio observations of four previously unidentified Galactic plane X-ray sources: AX J163252-4746, AX J184738-0156, AX J144701-5919, and AX J144547-5931. Detection of each source with the Chandra X-ray Observatory has provided sub-arcsecond localizations, which we use to identify bright infrared counterparts to all four objects. Infrared and optical spectroscopy of these counterparts demonstrate that all four X-ray sources are extremely massive stars, with spectral classifications: Ofpe/WN9 (AX J163252-4746), WN7 (AX J184738-0156 = WR121a), WN7-8h (AX J144701-5919), and OIf+ (AX J144547-5931). AX J163252-4746 and AX J184738-0156 are both luminous, hard, X-ray emitters with strong Fe xxv emission lines in their X-ray spectra at ∼6.7 keV. The multi-wavelength properties of AX J163252-4746 and AX J184738-0156 are not consistent with isolated massive stars or accretion onto a compact companion; we conclude that their X-ray emission is most likely generated in a colliding-wind binary (CWB) system. For both AX J144701-5919 and AX J144547-5931, the X-ray emission is an order of magnitude less luminous and with a softer spectrum. These properties are consistent with a CWB interpretation for these two sources also, but other mechanisms for the generation of X-rays cannot be excluded. There are many other as yet unidentified X-ray sources in the Galactic plane, with X-ray properties similar to those seen for AX J163252-4746, AX J184738-0156, AX J144701-5919, and AX J144547-5931. This may indicate a substantial population of X-ray-emitting massive stars and CWBs in the Milky Way.en
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.rightsOpen
dc.subjectstars: winds, outflows
dc.subjectstars: Wolf-Rayet
dc.subjectsupergiants
dc.subjectx-rays: binaries
dc.subjectx-rays: individual (AX J163252-4746, AX J184738-0156, AX J144701-5919, AX J144547-5931)
dc.subjectx-rays: stars
dc.titleIdentification of a population of X-ray-emitting massive stars in the Galactic planeen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2011
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-637X/727/2/105
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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