The broadband spectrum of Cygnus X-1

Details The broadband spectrum of Cygnus X-1 The broadband spectrum of Cygnus X-1

2007-06-14

arxiv.org/abs/0706.2137v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

The Black Hole (BH) binary Cygnus X-1 has been observed simultaneously by INTEGRAL, RXTE, and XMM-Newton for four times in November and December 2004, when Cyg X-1 became first observable with XMM-Newton. During these observations the source was found in one of its transitional states between the hard state and the soft state. We obtained a high signal to noise spectrum of Cyg X-1 from 3 keV to 1 MeV which allows us to put constraints on the nature of the Comptonizing plasma by modeling the continuum with Comptonization models as eqpair (Coppi 1992). Using XMM-Newton we were also able to confirm the presence of a relativistically broadened Fe K-alpha line.

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