Advanced Search
DSpace@MIT

Identification of A Population of X-ray-emitting Massive Stars in the Galactic Plane

Research and Teaching Output of the MIT Community

Show simple item record

dc.contributor.author Anderson, Gemma E.
dc.contributor.author Gaensler, B. M.
dc.contributor.author Kaplan, David L.
dc.contributor.author Posselt, Bettina
dc.contributor.author Slane, Patrick O.
dc.contributor.author Murray, Stephen S.
dc.contributor.author Mauerhan, Jon C.
dc.contributor.author Benjamin, Robert A.
dc.contributor.author Brogan, Crystal L.
dc.contributor.author Chakrabarty, Deepto
dc.contributor.author Drake, Jeremy J.
dc.contributor.author Drew, Janet E.
dc.contributor.author Grindlay, Jonathan E.
dc.contributor.author Hong, Jaesub
dc.contributor.author Lazio, Joseph W.
dc.contributor.author Lee, Julia C.
dc.contributor.author Steeghs, Danny T. H.
dc.contributor.author van Kerkwijk, Marten H.
dc.date.accessioned 2012-04-13T15:59:44Z
dc.date.available 2012-04-13T15:59:44Z
dc.date.issued 2011-01
dc.date.submitted 2010-08
dc.identifier.issn 0004-637X
dc.identifier.issn 1538-4357
dc.identifier.uri http://hdl.handle.net/1721.1/70016
dc.description.abstract We 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_US
dc.description.sponsorship United States. National Aeronautics and Space Administration (Hubble Fellowship grant 51230.01-A) en_US
dc.description.sponsorship Australian Research Council (Federation Fellowship grant FF0561298) en_US
dc.description.sponsorship United States. National Aeronautics and Space Administration (NASA Contract No. NAS8-03060) en_US
dc.description.sponsorship Science and Technology Facilities Council (Great Britain) (Advanced Fellowship) en_US
dc.language.iso en_US
dc.publisher Institute of Physics Publishing en_US
dc.relation.isversionof http://dx.doi.org/10.1088/0004-637x/727/2/105 en_US
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. en_US
dc.source Prof. Chakrabarty via Mat Willmott en_US
dc.title Identification of A Population of X-ray-emitting Massive Stars in the Galactic Plane en_US
dc.type Article en_US
dc.identifier.citation Anderson, Gemma E. et al. “Identification of A Population of X-ray-emitting Massive Stars in the Galactic Plane.” The Astrophysical Journal 727.2 (2011): 105. Web. en_US
dc.contributor.department Kavli Institute for Astrophysics and Space Research en_US
dc.contributor.department Massachusetts Institute of Technology. Department of Physics en_US
dc.contributor.approver Chakrabarty, Deepto
dc.contributor.mitauthor Chakrabarty, Deepto
dc.relation.journal Astrophysical Journal en_US
dc.identifier.mitlicense PUBLISHER_POLICY en_US
dc.eprint.version Final published version en_US
dc.type.uri http://purl.org/eprint/type/JournalArticle en_US
eprint.status http://purl.org/eprint/status/PeerReviewed en_US
dspace.orderedauthors Anderson, Gemma E.; Gaensler, B. M.; Kaplan, David L.; Posselt, Bettina; Slane, Patrick O.; Murray, Stephen S.; Mauerhan, Jon C.; Benjamin, Robert A.; Brogan, Crystal L.; Chakrabarty, Deepto; Drake, Jeremy J.; Drew, Janet E.; Grindlay, Jonathan E.; Hong, Jaesub; Lazio, T. Joseph W.; Lee, Julia C.; Steeghs, Danny T. H.; van Kerkwijk, Marten H. en


Files in this item

Name Size Format
Downloadable Full Text - PDF

This item appears in the following Collection(s)

Show simple item record

Open Access