Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20313801j&link_type=abstract
American Astronomical Society Meeting 203, #138.01; Bulletin of the American Astronomical Society, Vol. 36, p.584
Astronomy and Astrophysics
Astronomy
Scientific paper
We have used photoelectric absorption features in the Chandra/HETGS spectra of seven bright X-ray binaries to study the detailed spectroscopic structure of absorption in the interstellar medium (ISM). This represents the highest-resolution X-ray spectral study of interstellar absorption ever performed, revealing previously undetected features and demonstrating the inadequacy of existing models for grating data. In particular, we find that the O edge structure is well fit by a model that includes 5 absorption lines and 2 edges. We also identify the absorption lines at 23.51 and 22.88 A as the 1s-2p and 1s-3p resonance lines of neutral O. The remaining features are attributed to the 1s-2p lines of singly and doubly ionized O and allow an estimate of the relative abundance of ionized O in the ISM. We also present work on the absorption features due to Ne and Fe. This work is part of a larger program to produce a reliable high-resolution spectral model for interstellar absorption.
Chakrabarty Deepto
Juett Adrienne M.
Schulz Norbert S.
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