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Title of Journal: Astrophys Space Sci

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Abbravation: Astrophysics and Space Science

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Kluwer Academic Publishers

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DOI

10.1007/s10611-015-9554-x

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1572-946X

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Spectral fit of Cygnus X1 in high energy— a self

Authors: Samir Mandal Sandip K Chakrabarti
Publish Date: 2007/04/18
Volume: 309, Issue: 1-4, Pages: 305-308
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Abstract

We fit the spectra of Cyg X1 using two component advective flows with Keplerian accretion disks on the equatorial plane surrounded by subKeplerian disks when standing shocks are present The soft photons generated by the bremsstrahlung and synchrotron processes in the subKeplerian flow as well as the multicolour black body emission from the Keplerian disk are Comptonized by the thermal and nonthermal electrons By varying Keplerian and subKeplerian rates we are able to reproduce the observed soft and hard states as far as Xray region is concerned and ‘low γray intensity’ and ‘high γray intensity’ states as far as the soft γray region is concerned We also find two pivotal points where the spectra intersect as is observed in Cyg X1

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