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Title:
Constraints on light bending and reflection from the hard X-ray background
Authors:
Gandhi, P.; Fabian, A. C.; Suebsuwong, T.; Malzac, J.; Miniutti, G.; Wilman, R. J.
Affiliation:
AA(RIKEN Institute of Physical and Chemical Research, 2-1 Hirosawa, Wakoshi, Saitama 351-0198, Japan; Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AC(Centre d'Étude Spatiale des Rayonnements, 31028 Toulouse, France; Aerospace Engineering Department, Engineering Faculty, Kasetsart University, Bangkok, Thailand), AD(Centre d'Étude Spatiale des Rayonnements, 31028 Toulouse, France), AE(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AF(Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 382, Issue 3, pp. 1005-1018. (MNRAS Homepage)
Publication Date:
12/2007
Origin:
MNRAS
MNRAS Keywords:
galaxies: active, X-rays: galaxies
DOI:
10.1111/j.1365-2966.2007.12462.x
Bibliographic Code:
2007MNRAS.382.1005G

Abstract

Light bending due to strong gravity has recently been invoked to explain variability and flux correlations between different bands in some accreting black holes. A characteristic feature of light bending is reflection-dominated spectra, especially if photon sources lie in the deepest parts of the gravitational potential within a few gravitational radii of the event horizon. We use the spectrum of the hard X-ray background in order to constrain the prevalence of such reflection-dominated sources. We first emphasize the need for reflection and explore the broad-band properties of realistic spectra that incorporate light bending. We then use these spectra, in conjunction with the observed 2-10 keV active galactic nucleus distribution, evolutionary and obscuration functions in order to predict the hard X-ray background spectrum over 3-100 keV, and provide limits on the fraction of reflection-dominated objects, dependent on the height of the photon sources. Our results allow for a cosmologically-significant fraction of sources that incorporate strong light bending. The luminosity function based on intrinsic flare luminosities is derived and implications discussed. We discuss prospects for future hard X-ray missions such as New X-ray Telescope/Non-thermal Energy eXploration Telescope and Simbol-X that can image such sources as well as confirm the precise spectral shape of the X-ray background near its peak, important for constraining the universal relevance of light bending.
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