The interstellar oxygen-K absorption edge as observed by XMM-Newton

Details The interstellar oxygen-K absorption edge as observed by XMM-Newton The interstellar oxygen-K absorption edge as observed by XMM-Newton

2003-04-15

arxiv.org/abs/astro-ph/0304283v1

Astron.Astrophys. 404 (2003) 959-968

Astronomy and Astrophysics

Astrophysics

LaTeX2e A&A style, 10 pages, 12 postscript figures, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20030551

High resolution X-ray spectra of the Reflection Grating Spectrometer (RGS) on board the XMM satellite are used to resolve the oxygen K absorption edge. By combining spectra of low and high extinction sources, the observed absorption edge can be split in the true interstellar (ISM) extinction and the instrumental absorption. The detailed ISM edge structure closely follows the edge structure of neutral oxygen as derived by theoretical R-matrix calculations. However, the position of the theoretical edge requires a wavelength shift. In addition the detailed instrumental RGS absorption edge structure is presented. All results are verified by comparing to a subset of Chandra LETG-HRC observations.

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