Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..347g&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
The new space X-ray observatories XMM-Newton and Chandra have modified our vision of the photoionized media in the Active Galactic Nuclei (AGN) or in the X-ray binaries, by revealing the complexity of the soft X-ray spectra i.e. many observed lines, in particular the He-like ion lines of the n = 2 complex. These lines are al-ready used in the collisional plasmas as diagnostics to derive the temperature and the density of the media. We present a work based on the study of the He-like lion lines in the case of the photoionized media. We consider a grid of models built with our Titan code, encompassing a large range of parameters (such as the column density, the ionization parameter, the varying abundance and the possible existence of microtur-bulence) met in the emission medium, such as in the Seyfert 2 nuclei. We give the R and G ratios of the He-like ions (resonance, intercombination and forbidden lines). We show that a large microturbulence results in a decrease of the G ratio for large column densities, for which the He-triplet resonant lines are optically thick.
Collin Suzy
Dumont Anne-Marie
Godet Olivier
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