Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350l..37l&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. L37-L40. Research supported by NASA and Un
Astronomy and Astrophysics
Astrophysics
54
Cosmic Plasma, Photoionization, Spectral Signatures, X Ray Binaries, X Ray Spectra, Galactic Clusters, Spectrum Analysis, Stellar Mass Accretion, X Ray Sources
Scientific paper
Plasma emission codes have become a standard tool for the analysis of spectroscopic data from cosmic X-ray sources. However, the assumption of collisional equilibrium, typically invoked in these codes, renders them inapplicable to many important astrophysical situations, particularly those involving X-ray photoionized nebulae. This point is illustrated by comparing model spectra which have been calculated under conditions appropriate to both coronal plasmas and X-ray photoionized plasmas. It is shown that the (3s-2p)/(3d-2p) line ratios in the Fe L-shell spectrum can be used to effectively discriminate between these two cases. This diagnostic will be especially useful for data analysis associated with AXAF and XMM, which will carry spectroscopic instrumentation with sufficient sensitivity and resolution to identify X-ray photoionized nebulae in a wide range of astrophysical environments.
Goldstein William H.
Kahn Steven M.
Liedahl Duane Allen
Osterheld Albert L.
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