Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hrxs.confe..10g&link_type=abstract
High Resolution X-ray Spectroscopy: towards XEUS and Con-X, Proceedings of the international workshop held at the Mullard Space
Other
Scientific paper
The 'Warm Absorber' (WA) observed in Active Galactic Nuclei (AGN) displays zones of different density, temperature, and ionization. Such a medium is generally described by multiple regions modelled in constant density. Our approach to the study of the WA relies on the assumption of pressure equilibrium, which results in the natural stratification of the medium and allows to explain the presence of lines from different ionization states in many AGN observed by Chandra and XMM-Newton. Among the best WA observations available are those of NGC 3783, which we have analyzed. Models in pressure equilibrium present temperature discontinuities which, however difficult to tackle, can be adressed with the photoionization code TITAN, developed by our team. We have used this code to calculate a grid of constant total pressure models dedicated to fit the WA in NGC 3783. Our study shows that the WA can be modelled by a single medium in total pressure equilibrium; this could be the case for other warm absorbers presently modelled with multiple regions in constant density. In addition to describing the X-ray spectra, our models provide ionic column densitites for the lower ionization species that give rise to absorption lines in the UV. This information could be explored in future work, by extending our WA studies to the UV range.
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