THE REFLECTION COMPONENT FROM CYGNUS X-1 IN THE SOFT STATE MEASURED BY NuSTAR AND SUZAKU
Tomsick JA, Nowak MA, Parker M, Miller JM, Fabian AC, Harrison FA, Bachetti M, Barret D, Boggs SE, Christensen FE, Craig WW, Forster K, Fuerst F, Grefenstette BW, Hailey CJ, King AL, Madsen KK, Natalucci L, Pottschmidt K, Ross RR, Stern D, Walton DJ, Wilms J, Zhang WW (2014)
Publication Status: Published
Publication Type: Journal article
Publication year: 2014
Journal
Publisher: IOP PUBLISHING LTD
Book Volume: 780
Article Number: ARTN 78
Journal Issue: 1
DOI: 10.1088/0004-637X/780/1/78
Abstract
The black hole binary Cygnus X-1 was observed in late 2012 with the Nuclear Spectroscopic Telescope Array (NuSTAR) and Suzaku, providing spectral coverage over the similar to 1-300 keV range. The source was in the soft state with a multi-temperature blackbody, power law, and reflection components along with absorption from highly ionized material in the system. The high throughput of NuSTAR allows for a very high quality measurement of the complex iron line region as well as the rest of the reflection component. The iron line is clearly broadened and is well described by a relativistic blurring model, providing an opportunity to constrain the black hole spin. Although the spin constraint depends somewhat on which continuum model is used, we obtain a(*) > 0.83 for all models that provide a good description of the spectrum. However, none of our spectral fits give a disk inclination that is consistent with the most recently reported binary values for Cyg X-1. This may indicate that there is a > 13 degrees misalignment between the orbital plane and the inner accretion disk (i.e., a warped accretion disk) or that there is missing physics in the spectral models.
Authors with CRIS profile
Involved external institutions
California Institute of Technology (Caltech)
United States (USA) (US)
College of the Holy Cross
United States (USA) (US)
University of Maryland
United States (USA) (US)
National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF)
Italy (IT)
University of Michigan
United States (USA) (US)
Columbia University
United States (USA) (US)
University of California, Berkeley
United States (USA) (US)
Technical University of Denmark / Danmarks Tekniske Universitet (DTU)
Denmark (DK)
Université Fédérale de Toulouse Midi-Pyrénées
France (FR)
University of Cambridge
United Kingdom (GB)
Massachusetts Institute of Technology (MIT)
United States (USA) (US)
National Aeronautics and Space Administration (NASA)
United States (USA) (US)
United States (USA) (US)
College of the Holy Cross
United States (USA) (US)
University of Maryland
United States (USA) (US)
National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF)
Italy (IT)
University of Michigan
United States (USA) (US)
Columbia University
United States (USA) (US)
University of California, Berkeley
United States (USA) (US)
Technical University of Denmark / Danmarks Tekniske Universitet (DTU)
Denmark (DK)
Université Fédérale de Toulouse Midi-Pyrénées
France (FR)
University of Cambridge
United Kingdom (GB)
Massachusetts Institute of Technology (MIT)
United States (USA) (US)
National Aeronautics and Space Administration (NASA)
United States (USA) (US)
How to cite
APA:
Tomsick, J.A., Nowak, M.A., Parker, M., Miller, J.M., Fabian, A.C., Harrison, F.A.,... Zhang, W.W. (2014). THE REFLECTION COMPONENT FROM CYGNUS X-1 IN THE SOFT STATE MEASURED BY NuSTAR AND SUZAKU. Astrophysical Journal, 780(1). https://dx.doi.org/10.1088/0004-637X/780/1/78
MLA:
Tomsick, John A., et al. "THE REFLECTION COMPONENT FROM CYGNUS X-1 IN THE SOFT STATE MEASURED BY NuSTAR AND SUZAKU." Astrophysical Journal 780.1 (2014).
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