Search for scattered X-ray halos around variable sources - The X-ray halo of Cygnus X-1

Details Search for scattered X-ray halos around variable sources - The X-ray halo of Cygnus X-1 Search for scattered X-ray halos around variable sources - The X-ray halo of Cygnus X-1

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..845b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 845-851. DOE-SERC-supported research.

Physics

Optics

24

Halos, Interstellar Matter, Variable Stars, X Ray Scattering, X Ray Sources, Brightness Distribution, Cygnus Constellation, Data Acquisition, Data Reduction, Stellar Models, Stellar Spectrophotometry

Scientific paper

The results of a program to search for the presence of halos due to X-ray scattering by interstellar grains in the line-of-sight to variable X-ray sources are reported. As part of this program, four Einstein HRI images of Cyg X-1 were examined. The analysis technique exploits the intrinsic aperiodic variability of this source to map the point response function of the optics. Any scattered halo present will not reflect short-term central source time variability, since such variability is smoothed by differential time delays of order days. Thus, a residual, nonvariable component to the surface brightness distribution (comprising about 12 percent or more of the source flux) is interpreted as a scattered halo. The Cyg X-1 halo is consistent with those of other sources found in previous studies using different techniques. Comparison is also made with a scattering model and, despite uncertainties in source spectrum and distance, reasonable agreement with the observatons is found using a standard interstellar grain model. The potential of X-ray scattering as a probe of the properties of interstellar grains is demonstrated.

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