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Discovery Of A 552 Hz Burst Oscillation In The Low-Mass X-Ray Binary Exo 0748–676

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dc.contributor Massachusetts Institute of Technology. Department of Physics
dc.contributor MIT Kavli Institute for Astrophysics and Space Research
dc.contributor Lin, Jinrong
dc.contributor Chakrabarty, Deepto
dc.creator Galloway, Duncan K.
dc.creator Lin, Jinrong
dc.creator Chakrabarty, Deepto
dc.creator Hartman, Jacob M., Ph. D. Massachusetts Institute of Technology
dc.date 2013-01-08T15:56:25Z
dc.date 2013-01-08T15:56:25Z
dc.date 2010-02
dc.date 2009-10
dc.date.accessioned 2023-03-01T18:11:12Z
dc.date.available 2023-03-01T18:11:12Z
dc.identifier 0004-637X
dc.identifier 1538-4357
dc.identifier http://hdl.handle.net/1721.1/76190
dc.identifier Galloway, Duncan K. et al. “Discovery Of A 552 Hz Burst Oscillation In The Low-Mass X-Ray Binary Exo 0748–676.” The Astrophysical Journal 711.2 (2010): L148–L151. Web. 8 Jan. 2013.
dc.identifier https://orcid.org/0000-0001-8804-8946
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/279076
dc.description We report the detection of pulsations at 552 Hz in the rising phase of two type-I (thermonuclear) X-ray bursts observed from the accreting neutron star EXO 0748–676 in 2007 January and December, by the Rossi X-ray Timing Explorer. The fractional amplitude was 15% (rms). The dynamic power density spectrum for each burst revealed an increase in frequency of ≈1-2 Hz while the oscillation was present. The frequency drift, the high significance of the detections and the almost identical signal frequencies measured in two bursts separated by 11 months, confirms this signal as a burst oscillation similar to those found in 13 other sources to date. We thus conclude that the spin frequency in EXO 0748 – 676 is within a few Hz of 552 Hz, rather than 45 Hz as was suggested from an earlier signal detection by Villarreal & Strohmayer. Consequently, Doppler broadening must significantly affect spectral features arising from the neutron star surface, so that the narrow absorption features previously reported from an XMM-Newton spectrum could not have arisen there. The origin of both the previously reported 45 Hz oscillation and the X-ray absorption lines is now uncertain.
dc.format application/pdf
dc.language en_US
dc.publisher IOP Publishing
dc.relation http://dx.doi.org/10.1088/2041-8205/711/2/l148
dc.relation Astrophysical Journal
dc.rights Creative Commons Attribution-Noncommercial-Share Alike 3.0
dc.rights http://creativecommons.org/licenses/by-nc-sa/3.0/
dc.source arXiv
dc.title Discovery Of A 552 Hz Burst Oscillation In The Low-Mass X-Ray Binary Exo 0748–676
dc.type Article
dc.type http://purl.org/eprint/type/JournalArticle


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