NDLI: Multi-satellite observations of cygnus x-1 to study the focused wind and absorption dips

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Multi-satellite observations of cygnus x-1 to study the focused wind and absorption dips

Content Provider	NASA Technical Reports Server (NTRS)
Author	Schultz, Norbert S. Lee, Julia C. Pottschmidt, Katja Boeck, Moritz Hanke, Manfred Nowak, Michael A. Wilms, Joern
Copyright Year	2008
Description	High-mass X-ray binary systems are powered by the stellar wind of their donor stars. The X-ray state of Cygnus X-1 is correlated with the properties of the wind which defines the environment of mass accretion. Chandra-HETGS observations close to orbital phase 0 allow for an analysis of the photoionzed stellar wind at high resolution, but because of the strong variability due to soft X-ray absorption dips, simultaneous multi-satellite observations are required to track and understand the continuum, too. Besides an earlier joint Chandra and RXTE observation, we present first results from a recent campaign which represents the best broad-band spectrum of Cyg X-1 ever achieved: On 2008 April 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 the radio. After superior conjunction of the black hole, we detect soft X-ray absorption dips likely due to clumps in the focused wind covering greater than or equal to 95% of the X-ray source, with column densities likely to be of several 10(exp 23) cm(exp -2), which also affect photon energies above 20 keV via Compton scattering.
File Size	802169
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090005035
Archival Resource Key	ark:/13960/t70w3fz8m
Language	English
Publisher Date	2008-09-01
Access Restriction	Open
Subject Keyword	Astrophysics Cygnus Constellation Stellar Winds Stellar Mass Accretion X Ray Binaries Satellite Observation Black Holes Astronomy X Ray Absorption X Ray Sources Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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