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Conflicting Disk Inclination Estimates for the Black Hole X-Ray Binary XTE J1500−564

Connors, Riley M. T. and García, Javier A. and Steiner, James F. and Grinberg, Victoria and Dauser, Thomas and Sridhar, Navin and Gatuzz, Efrain and Tomsick, John and Markoff, Sera B. and Harrison, Fiona (2019) Conflicting Disk Inclination Estimates for the Black Hole X-Ray Binary XTE J1500−564. Astrophysical Journal, 882 (2). Art. No. 179. ISSN 1538-4357. doi:10.3847/1538-4357/ab35df.

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The dynamical characteristics of XTE J1550−564, a black hole X-ray binary, are well established, and the broadband spectral evolution of the source has been well studied. Its orbital inclination is known to be high, at ~75°, with the jet estimated to align well with the orbital axis. We explore simultaneous observations made with the Advanced Satellite for Cosmology and Astrophysics and Rossi X-ray Timing Explorer covering the 1–200 keV band during the early stages of the first outburst of XTE J1550−564 in its hard-intermediate state on 1998 September 23/24. We show that the most up-to-date reflection models applied to these data yield an inclination estimate much lower than that found in previous studies at ~40°, grossly disagreeing with the dynamically estimated orbital inclination. We discuss the possible explanations for this disagreement and its implications for reflection models, including possible physical scenarios in which either the inner disk is misaligned with both the binary orbit and the outer jet or the inner accretion flow, corona, and/or jet have vertical structure that leads to lower inferred disk inclination through various physical means.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Connors, Riley M. T.0000-0002-8908-759X
García, Javier A.0000-0003-3828-2448
Steiner, James F.0000-0002-5872-6061
Grinberg, Victoria0000-0003-2538-0188
Dauser, Thomas0000-0003-4583-9048
Sridhar, Navin0000-0002-5519-9550
Gatuzz, Efrain0000-0002-3252-9633
Tomsick, John0000-0001-5506-9855
Markoff, Sera B.0000-0001-9564-0876
Harrison, Fiona0000-0003-2992-8024
Additional Information:© 2019 The American Astronomical Society. Received 2019 May 31; revised 2019 July 19; accepted 2019 July 23; published 2019 September 16. We thank Kristin Madsen, Brian Grefenstette, Hiromasa Miyasaka, Yoshihiro Ueda, and Ken Ebisawa for very valuable discussions regarding the details of the X-ray data used in our analysis. J.A.G. acknowledges support from NASA grant NNX15AV31G and the Alexander von Humboldt Foundation. R.M.T.C. has been supported by NASA grant 80NSSC177K0515. V.G. is supported through the Margarete von Wrangell fellowship by the ESF and the Ministry of Science, Research and the Arts Baden-Württemberg. This research has made use of data, software, and/or web tools obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), a service of the Astrophysics Science Division at NASA/GSFC, and the Smithsonian Astrophysical Observatory's High Energy Astrophysics Division. This work has also been conducted within the NuSTAR working group, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We are thankful for the support of its members in producing this research. Facility: RXTE - Rossi X-ray Timing Explorer (PCA, Jahoda et al. 1996; HEXTE, Rothschild et al. 1998), ASCA (GIS; Makishima et al. 1996), HEASARC. Software: XSPEC v.12.10.0c (Arnaud 1996), EMCEE (Foreman-Mackey et al. 2013b), XILLVER (García & Kallman 2010; García et al. 2013), RELXILL (v1.2.0; Dauser et al. 2014; García et al. 2014).
Group:NuSTAR, Space Radiation Laboratory, Astronomy Department
Funding AgencyGrant Number
Alexander von Humboldt FoundationUNSPECIFIED
European Social FundUNSPECIFIED
Ministry of Science, Research and the Arts (Baden-Württemberg)UNSPECIFIED
Subject Keywords:accretion, accretion disks – atomic processes – black hole physics
Issue or Number:2
Record Number:CaltechAUTHORS:20190916-143938315
Persistent URL:
Official Citation:Riley M. T. Connors et al 2019 ApJ 882 179
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98660
Deposited By: Tony Diaz
Deposited On:16 Sep 2019 21:52
Last Modified:16 Nov 2021 17:40

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