GRS 1739-278 OBSERVED AT VERY LOW LUMINOSITY WITH XMM-NEWTON AND NuSTAR

K Yamaoka; T Dauser; J. M Miller; M Clavel; S Corbel; A Fabian; J García; F. A Harrison; A Loh; P Kaaret; E Kalemci; S Migliari; J. C. A Miller-Jones; K Pottschmidt; F Rahoui; J Rodriguez; D Stern; M Stuhlinger; D. J Walton; F Fürst; J. A Tomsick; J Wilms

doi:10.3847/0004-637X/832/2/115

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GRS 1739-278 OBSERVED AT VERY LOW LUMINOSITY WITH XMM-NEWTON AND NuSTAR

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GRS 1739-278 OBSERVED AT VERY LOW LUMINOSITY WITH XMM-NEWTON AND NuSTAR

K Yamaoka, T Dauser, J. M Miller, M Clavel, S Corbel, A Fabian, J García, F. A Harrison, A Loh, P Kaaret, …

The Astrophysical journal, Vol.832(2), p.115

11/22/2016

DOI: 10.3847/0004-637X/832/2/115

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Abstract

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 ). The broadband X-ray spectrum between 0.5 and 60 keV can be well-described 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 . In combination with measurements of the spin and inclination parameters made with NuSTAR during a brighter hard state by Miller et al., 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 (5-12 ) at the 90% confidence limit. These values depend strongly on the assumptions and we discuss possible systematic uncertainties.

accretion, accretion disks

stars: black holes

X-rays: binaries

X-rays: individual (GRS 1739-278)

Details

Title: Subtitle: GRS 1739-278 OBSERVED AT VERY LOW LUMINOSITY WITH XMM-NEWTON AND NuSTAR
Creators: K Yamaoka - Nagoya University
T Dauser - Dr. Karl-Remeis-Sternwarte
J. M Miller - University of Michigan
M Clavel - University of California, Berkeley
S Corbel - Université Paris Sciences et Lettres
A Fabian - University of Cambridge
J García - Harvard University
F. A Harrison - Cahill Center for Astronomy and Astrophysics
A Loh - Astrophysique Interprétation Modélisation
P Kaaret - University of Iowa
E Kalemci - Faculty of Engineering and Natural Sciences
S Migliari - European Space Astronomy Centre
J. C. A Miller-Jones - International Centre for Radio Astronomy Research
K Pottschmidt - Goddard Space Flight Center
F Rahoui - Harvard University
J Rodriguez - Astrophysique Interprétation Modélisation
D Stern - Jet Propulsion Laboratory
M Stuhlinger - European Space Astronomy Centre
D. J Walton - Jet Propulsion Laboratory
F Fürst - Cahill Center for Astronomy and Astrophysics
J. A Tomsick - University of California, Berkeley
J Wilms - Dr. Karl-Remeis-Sternwarte
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.832(2), p.115
DOI: 10.3847/0004-637X/832/2/115
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Number of pages: 7
Language: English
Date published: 11/22/2016
Academic Unit: Physics and Astronomy
Record Identifier: 9984200057902771

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