X-ray Absorption in the Interstellar Medium

Details X-ray Absorption in the Interstellar Medium X-ray Absorption in the Interstellar Medium

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.0602j&link_type=abstract

American Astronomical Society, HEAD meeting #7, #06.02; Bulletin of the American Astronomical Society, Vol. 35, p.607

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used photoelectric absorption features in the Chandra/HETGS spectra of eight bright X-ray binaries to study the relative abundances of O, Fe, and Ne in the interstellar medium (ISM). We find Ne/O abundance ratios up to twice as large as predicted by standard ISM models, and Fe/O ratios of 0.6--1 times the predicted ratio. The shape and wavelength of the photoelectric edges is used to discriminate between atomic and molecular forms of these elements. We found that the O edge contains complex structure and measured edge wavelengths range from the expected atomic value of 22.78 Å/ up to 23.3 Å, presumably due to molecular effects. Through these measurements, we hope to better understand the line of sight variations in the abundances and to produce a universal absorption edge model for use by the community.

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