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Preprint 07c/05

The broad band spectrum of Cyg X-1

S. Fritz (1), J. Wilms (2), K. Pottschmidt (3), M. A. Nowak (4), I. Kreykenbohm (1,5), A. Santangelo (1)

(1) Institut für Astronomie und Astrophysik, Sand 1, 72076 Tübingen, Germany
(2) Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
(3) Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093-0424, USA
(4) MIT-CXC, NE80-6077, 77 Massachusetts Ave., Cambridge, MA 02139, USA
(5) INTEGRAL Science Data Centre, 16 Ch. d'Ecogia, 1290 Versoix, Switzerland

To be published in: Proceedings of "The X-ray Universe 2005", San Lorenzo de El Escorial (Spain), 26-30 September 2005

Abstract. We present first results on INTEGRAL and RXTE from our multi-mission observing campaign on Cygnus X-1. The black hole binary Cyg X-1 has been observed simultaneously by INTEGRAL, RXTE, and XMM-Newton for four times in 2004 November and December, when Cyg X-1 became first observable with XMM-Newton (see contribution by Wilms et al., these proceedings). One of the scientific aims of this campaign was the measurement of a high signal to noise spectrum of Cyg X-1 from 2.5 keV to >600 keV in order to constrain models for the hard spectral component. We show here first results of our ongoing analysis obtained by modeling the broad band spectrum with simple empirical models as well as with Comptonization models.
Key words: Interacting Binaries; Cyg X-1

Preprint (62 kb PDF file including figures)

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