Revisiting Standard Helium-like X-ray Diagnostics

Details Revisiting Standard Helium-like X-ray Diagnostics Revisiting Standard Helium-like X-ray Diagnostics

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3401p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #34.01; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

A complete model of helium-like line and continuum emission in astrophysical plasmas has been incorporated into the plasma simulation code CLOUDY. All elements between He and Zn are treated, any number of levels can be considered, and a full treatment of radiative and collisional processes is included. This includes photoionization from all levels, line transfer including continuum pumping and destruction by background opacities, scattering, and collisional processes. The model is calculated self-consistently with the ionization and thermal structure of the surrounding nebula. The result is a complete line and continuum spectrum of the plasma. Here we focus on the ions of the sequence and reconsider the standard helium-like X-ray diagnostics. We perform numerical calculations of the line ratios as a function of ionizing flux and hydrogen density. In particular, we demonstrate that the R-ratio is a good density indicator only for a known ionization fraction and can become optically thick for large column densities. We also introduce the notion that the R-ratio is a measure of ionizing flux. This, in turn, allows for a measure of the obscured UV continuum, assuming a given continuum shape.

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