Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-11
Astronomy and Astrophysics
Astrophysics
38 pages, submitted to Ap.J. Supp
Scientific paper
10.1086/424039
We calculate the efficiency of iron K line emission and iron K absorption in photoionized models using a new set of atomic data. These data are more comprehensive than those previously applied to the modeling of iron K lines from photoionized gases, and allow us to systematically examine the behavior of the properties of line emission and absorption as a function of the ionization parameter, density and column density of model constant density clouds. We show that, for example, the net fluorescence yield for the highly charged ions is sensitive to the level population distribution produced by photoionization, and these yields are generally smaller than those predicted assuming the population is according to statistical weight. We demonstrate that the effects of the many strongly damped resonances below the K ionization thresholds conspire to smear the edge, thereby potentially affecting the astrophysical interpretation of absorption features in the 7-9 keV energy band. We show that the centroid of the ensemble of K$\alpha$ lines, the K$\beta$ energy, and the ratio of the K$\alpha_1$ to K$\alpha_2$ components are all diagnostics of the ionization parameter of our model slabs
Bautista Manuel A.
Kallman Tim R.
Krolik Julian H.
Mendoza Carolina
Palmeri Patrick
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