Spectral Signatures of X-Ray Photoionized Nebulae
Abstract
The applicability of the tools of X ray line spectroscopy into regions of the physical parameter space not addressed by existing plasma emission codes is considered. Atomic models for the ions Fe XVI to XIX are calculated assuming conditions appropriate to X ray photoionized cosmic sources. The resulting L-shell line spectra are easily distinguished from coronal spectra and provide diagnostics of the dominant level population mechanisms operating in the line emitting regions. Einstein objective grating spectra from the low mass X ray binaries, Cyg X-2, GX9+9, and 4U1820-30, may be consistent with predictions of spectra from X ray photoionized sources.
- Publication:
-
Two Topics in X-Ray Astronomy, Volume 1: X Ray Binaries. Volume 2: AGN and the X Ray Background
- Pub Date:
- November 1989
- Bibcode:
- 1989ESASP.296..505L
- Keywords:
-
- Gratings (Spectra);
- Nebulae;
- Photoionization;
- Spectral Signatures;
- X Ray Astronomy;
- X Ray Spectra;
- Coronas;
- Cosmic Rays;
- Emission Spectra;
- Iron;
- Line Spectra;
- Spectrum Analysis;
- X Ray Sources;
- Astronomy