A Thermal-Nonthermal Inverse Compton Model for Cyg X-1

Details A Thermal-Nonthermal Inverse Compton Model for Cyg X-1 A Thermal-Nonthermal Inverse Compton Model for Cyg X-1

1997-07-01

arxiv.org/abs/astro-ph/9707006v1

AIP Conf.Proc. 410 (1997) 868-871

Astronomy and Astrophysics

Astrophysics

5 pages, 2 PostScript figure, uses aipproc.sty, to appear in Proceedings of Fourth Compton Symposium

Scientific paper

10.1063/1.54154

Using Monte Carlo methods to simulate the inverse Compton scattering of soft photons, we model the spectrum of the Galactic black hole candidate Cyg X-1, which shows evidence of a nonthermal tail extending beyond a few hundred keV. We assume an ad hoc sphere of leptons, whose energy distribution consists of a Maxwellian plus a high energy power-law tail, and inject 0.5 keV blackbody photons. The spectral data is used to constrain the nonthermal plasma fraction and the power-law index assuming a reasonable Maxwellian temperature and Thomson depth. A small but non-negligible fraction of nonthermal leptons is needed to explain the power-law tail.

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