Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hrxs.confe..21k&link_type=abstract
High Resolution X-ray Spectroscopy with XMM-Newton and Chandra, Proceedings of the international workshop held at the Mullard Sp
Other
Scientific paper
There are two main types of X-ray line-emitting plasmas: hot, collisionally-ionized plasmas and warm, photoionized plasmas. Atomic data and spectral models for hot, collisionally-ionized plasmas are highly reliable, having been extensively tested in the laboratory, in the Sun, and, very recently, in a host of other astrophysical sources. However, atomic data and spectral models of photoionized plasmas have not received the same level of attention, primarly due to the infeasibility of laboratory testing and, until only very recently, the lack of high-resolution X-ray spectra of astrophysical sources. We present a new, simple model of a photoionized plasma (XSPEC model "PHOTOION"), which uses atomic data calculated by the public atomic code FAC and verified (where possible) with other atomic codes. "PHOTOION" was first applied to the spectacular RGS spectrum of the Seyfert 2 galaxy, NGC 1068. This constituted the first detailed, quantitative test of a photoionization code. "PHOTOION" can similarly be used to fit a wide range of other X-ray sources in which warm, photoionized gas may be present, including Seyfert 1 galaxies, X-ray binaries, cataclysmic variables, and gamma ray bursts.
Behar Ehud
Brinkman Bert
der Meer Rob van
Gu Min Feng
Kaastra Jelle
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