On the Absorption of X‐Rays in the Interstellar Medium
J. WilmsInstitut für Astronomie und Astrophysik, Abteilung Astronomie, Waldhäuser Strasse 64, D-72076 Tübingen, GermanyA. AllenJILA, University of Colorado, Campus Box 440, Boulder, CO 80309-0440R. McCrayJILA, University of Colorado, Campus Box 440, Boulder, CO 80309-0440
2000en
ABI
Abstract
We present an improved model for the absorption of X-rays in the ISM intended for use with data from future X-ray missions with larger effective areas and increased energy resolution such as Chandra and XMM, in the energy range above 100eV. Compared to previous work, our formalism includes recent updates to the photoionization cross section and revised abundances of the interstellar medium, as well as a treatment of interstellar grains and the H2molecule. We review the theoretical and observational motivations behind these updates and provide a subroutine for the X-ray spectral analysis program XSPEC that incorporates our model.
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