The Reflection Component from Cygnus X-1 in the Soft State Measured by NuSTAR and Suzaku

Research output: Research - peer-reviewJournal article – Annual report year: 2014

  • Author: Tomsick, John A.

  • Author: Nowak, Michael A.

    Massachusetts Institute of Technology

  • Author: Parker, Michael

    Massachusetts Institute of Technology

  • Author: Miller, Jon M.

    University of Michigan, United States

  • Author: Fabian, Andy C.

    University of Cambridge

  • Author: Harrison, Fiona A.

    California Institute of Technology

  • Author: Bachetti, Matteo

    Centre National de la Recherche Scientifique

  • Author: Barret, Didier

    Centre National de la Recherche Scientifique

  • Author: Boggs, Steven E.

    SSL/UCB

  • Author: Christensen, Finn Erland

    Astrophysics, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Craig, William W.

    SSL/UCB and LLNL

  • Author: Forster, Karl

    California Institute of Technology

  • Author: Fuerst, Felix

    California Institute of Technology

  • Author: Grefenstette, Brian W.

    California Institute of Technology

  • Author: Hailey, Charles J.

    Columbia University

  • Author: King, Ashley L.

    University of Michigan, United States

  • Author: Madsen, Kristin K.

    California Institute of Technology

  • Author: Natalucci, Lorenzo

    National Institute for Astrophysics

  • Author: Pottschmidt, Katja

    NASA Goddard Space Flight Center

  • Author: Ross, Randy R.

    College of the Holy Cross

  • Author: Stern, Daniel

    NASA Jet Propulsion Laboratory

  • Author: Walton, Dominic J.

    California Institute of Technology

  • Author: Wilms, Joern

    Dr. Karl-Remeis-Sternwarte and Erlangen Center for Astroparticle Physics

  • Author: Zhang, William W.

    NASA Goddard Space Flight Center

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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 ~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 degree 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.
Original languageEnglish
JournalAstrophysical Journal
Volume780
Issue number1
Number of pages10
ISSN0004-637X
DOIs
StatePublished - 2014
CitationsWeb of Science® Times Cited: 54
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