Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.0203s&link_type=abstract
American Astronomical Society, HEAD meeting #7, #02.03; Bulletin of the American Astronomical Society, Vol. 35, p.605
Astronomy and Astrophysics
Astronomy
Scientific paper
X-ray halos created by interstellar dust grains have been observed with Einstein, ROSAT, and ASCA. However, Chandra observations qualitatively change the analysis that can be done, while XMM/Newton provides substantially more data on X-ray halos than has ever been available. The variation in the halo intensity with energy and angle is strongly dependent on the composition, size, and position of the dust grains. Prior observations allowed at best rough estimates of the dust grain properties to be made. Recently, Smith, Edgar & Shafer (2002) used Chandra observations of the LMXB GX13+1 to measure X-ray halos in far greater detail than ever before. We present results analyzed in a similar fashion using archival Chandra and XMM/Newton data on Galactic sources to measure energy-resolved X-ray halos. We will show comparisons of our results to existing dust grain models. We gratefully acknowledge support for this work from NASA Grant AR1-2006X.
Dwek Eli
Smith Randall K.
Witt Adolf N.
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