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dc.contributor.authorFürst, F.
dc.contributor.authorTomsick, J.
dc.contributor.authorYamaoka, K.
dc.contributor.authorDauser, T.
dc.contributor.authorMiller, J.
dc.contributor.authorClavel, M.
dc.contributor.authorCorbel, S.
dc.contributor.authorFabian, A.
dc.contributor.authorGarcía, J.
dc.contributor.authorHarrison, F.
dc.contributor.authorLoh, A.
dc.contributor.authorKaaret, P.
dc.contributor.authorKalemci, E.
dc.contributor.authorMigliari, S.
dc.contributor.authorMiller-Jones, James
dc.contributor.authorPottschmidt, K.
dc.contributor.authorRahoui, F.
dc.contributor.authorRodriguez, J.
dc.contributor.authorStern, D.
dc.contributor.authorStuhlinger, M.
dc.contributor.authorWalton, D.
dc.contributor.authorWilms, J.
dc.date.accessioned2017-01-30T11:16:22Z
dc.date.available2017-01-30T11:16:22Z
dc.date.created2016-12-28T19:30:21Z
dc.date.issued2016
dc.identifier.citationFürst, F. and Tomsick, J. and Yamaoka, K. and Dauser, T. and Miller, J. and Clavel, M. and Corbel, S. et al. 2016. GRS 1739-278 observed at very low luminosity with XMM-NEWTON and NuSTAR. Astrophysical Journal. 832 (2): pp. 1-7.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/10029
dc.identifier.doi10.3847/0004-637X/832/2/115
dc.description.abstract

We present a detailed spectral analysis of XMM-Newton and NuSTAR observations of the accreting transient black hole GRS 1739−278 during a very faint low hard state at ∼0.02% of the Eddington luminosity (for a distance of 8.5 kpc and a mass of 10 M ). The broad-band X-ray spectrum between 0.5–60 keV can be welldescribed by a power law continuum with an exponential cutoff. The continuum is unusually hard for such a low luminosity, with a photon index of Γ = 1.39 ± 0.04. We find evidence for an additional reflection component from an optically thick accretion disk at the 98% likelihood level. The reflection fraction is low with Rrefl = 0.043+0.033 −0.023. In combination with measurements of the spin and inclination parameters made with NuSTAR during a brighter hard state by Miller and co-workers, we seek to constrain the accretion disk geometry. Depending on the assumed emissivity profile of the accretion disk, we find a truncation radius of 15–35 Rg (5–12 RISCO) at the 90% confiden

dc.publisherInstitute of Physics Publishing
dc.titleGRS 1739-278 observed at very low luminosity with XMM-NEWTON and NuSTAR
dc.typeJournal Article
dcterms.source.volume832
dcterms.source.number2
dcterms.source.issn0004-637X
dcterms.source.titleAstrophysical Journal
curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusOpen access


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