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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.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.

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.titleAstrophysical Journal
curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusOpen access

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