Multi-Satellite Observations of Cygnus X-1 to Study the Focused Wind and Absorption Dips - AstrophysicsReportar como inadecuado




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Abstract: High-mass X-ray binary systems are powered by the stellar wind of their donorstars. The X-ray state of Cygnus X-1 is correlated with the properties of thewind which defines the environment of mass accretion. Chandra-HETGSobservations close to orbital phase 0 allow for an analysis of the photoionzedstellar wind at high resolution, but because of the strong variability due tosoft X-ray absorption dips, simultaneous multi-satellite observations arerequired to track and understand the continuum, too. Besides an earlier jointChandra and RXTE observation, we present first results from a recent campaignwhich represents the best broad-band spectrum of Cyg X-1 ever achieved: On 2008April 18-19 we observed this source with XMM-Newton, Chandra, Suzaku, RXTE,INTEGRAL, Swift, and AGILE in X- and gamma-rays, as well as with VLA in theradio. After superior conjunction of the black hole, we detect soft X-rayabsorption dips likely due to clumps in the focused wind covering >95 % of theX-ray source, with column densities likely to be of several 10^23 cm^-2, whichalso affect photon energies above 20 keV via Compton scattering.



Autor: Manfred Hanke, Joern Wilms, Moritz Boeck, Michael A. Nowak, Norbert S. Schulz, Katja Pottschmidt, Julia C. Lee

Fuente: https://arxiv.org/







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