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On Estimating the High-Energy Cutoff in the X-Ray Spectra of Black Holes via Reflection Spectroscopy

García, Javier A. and Dauser, Thomas and Steiner, James F. and McClintock, Jeffrey E. and Keck, Mason L. and Wilms, Jörn (2015) On Estimating the High-Energy Cutoff in the X-Ray Spectra of Black Holes via Reflection Spectroscopy. Astrophysical Journal, 808 (2). L37-L42. ISSN 0004-637X. doi:10.1088/2041-8205/808/2/L37.

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The fundamental parameters describing the coronal spectrum of an accreting black hole are the slope Γ of the power-law continuum and the energy E_(cut) at which it rolls over. Remarkably, this latter parameter can be accurately measured for values as high as 1 MeV by modeling the spectrum of X-rays reflected from a black hole accretion disk at energies below 100 keV. This is possible because the details in the reflection spectrum, rich in fluorescent lines and other atomic features, are very sensitive to the spectral shape of the hardest coronal radiation illuminating the disk. We show that by fitting simultaneous NuSTAR (3–79 keV) and low-energy (e.g., Suzaku) data with the most recent version of our reflection model relxill one can obtain reasonable constraints on E_(cut) at energies from tens of keV up to 1 MeV, for a source as faint as 1 mCrab in a 100 ks observation.

Item Type:Article
Related URLs:
URLURL TypeDescription
García, Javier A.0000-0003-3828-2448
Dauser, Thomas0000-0003-4583-9048
Steiner, James F.0000-0002-5872-6061
Wilms, Jörn0000-0003-2065-5410
Additional Information:© 2015 The American Astronomical Society. Received 2015 March 1, accepted for publication 2015 July 2, Published 2015 July 27. J.G. and J.E.M. acknowledge the support of NASA grant NNX11AD08G. J.F.S. has been supported by NASA Hubble Fellowship HST-HF-51315.01.
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF-51315.01
Issue or Number:2
Record Number:CaltechAUTHORS:20150824-150947187
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59862
Deposited By: Joy Painter
Deposited On:24 Aug 2015 22:33
Last Modified:10 Nov 2021 22:26

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