Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20311406s&link_type=abstract
American Astronomical Society Meeting 203, #114.06; Bulletin of the American Astronomical Society, Vol. 35, p.1391
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. Smith, Edgar & Shafer (2002) used Chandra observations of the LMXB GX13+1 to measure an X-ray halo 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. In addition, we can combine the X-ray data with CO and 21 cm spectral line surveys of the inner Galaxy to further constrain our modelling efforts. We will show comparisons of our results to existing dust grain models.
We gratefully acknowledge support for this work from NASA Grants AR1-2006X and NAG5-13180.
Dame Thomas M.
Smith Randall K.
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