Origin of power-law X-ray emission in the Steep power-law state of X-ray Binaries

Details Origin of power-law X-ray emission in the Steep power-law state of X-ray Binaries Origin of power-law X-ray emission in the Steep power-law state of X-ray Binaries

2009-05-18

arxiv.org/abs/0905.2904v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages

Scientific paper

We present a new scenario of the emissive origin in the Steep Power Law (SPL) state of X-ray Binaries. The power-law component of X-ray emission is the synchrotron radiation of relativistic electrons in highly magnetized compact spots orbiting near the inner stable circular orbit (ISCO) of black hole and has a hard spectrum that extends to above MeV bands determined by electron acceleration rate. These photons are then down-scattered by the surrounding plasma and form an observed steep spectrum. The relevance of this model with high-frequency quasi-periodic oscillations (HFQPOs) and extremely high luminosity of the SPL state is discussed.

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