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Title:
Search For A Black Hole Horizon Signature In X-ray Spectra Of Galactic Bhc With Rxte
Authors:
Shaposhnikov, Nikolai; Titarchuk, L.
Affiliation:
AA(University of Maryland/CRESST/GSFC), AB(NRL/GSFC/GMU)
Publication:
American Astronomical Society, AAS Meeting #214, #304.04; Bulletin of the American Astronomical Society, Vol. 41, p.721
Publication Date:
05/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21430404S

Abstract

We study the evolution of energy spectrum of Galactic Black Hole X-ray binaries in order to search for possible signatures of BH horizon. We find that the saturation of the photon index of the non-thermal spectral component is observed during BH state transitions from low-hard to high-soft states in agreement with the Bulk Motion Comptonization model. We present observational and theoretical arguments that the index saturation effect is a black hole horizon signature.
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arXiv e-prints