Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf..311p&link_type=abstract
Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co
Astronomy and Astrophysics
Astrophysics
Scientific paper
Observations of Active Galactic Nuclei (AGNs) in the X-ray range allow access to the central region which hosts a Supermassive Black Hole. In particular, X-ray spectra have revealed the presence of a highly-ionized hot medium in the central region: the "Warm Absorber". This medium is an important component (in mass and in size), such as the well-known Broad Line Region'' and Narrow-Line Region''. I will present X-ray plasma diagnostics, based on the lines of Helium-like ions, which allow an accurate estimate of the plasma electronic density, temperature and the determination of which ionization processes occur. I will show how, for the first time, these diagnostics are applied to "Warm Absorber" in AGNs thanks to the unprecedented characteristics of the new generation of X-ray satellites (XMM-Newton, Chandra): high-sensitivity, fine spectroscopy and arcsecond imagery.
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