Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..371p&link_type=abstract
SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,
Astronomy and Astrophysics
Astrophysics
Scientific paper
We will present how the new generation of X-ray satellites, Chandra and XMM-Newton, brings us a wholly new understanding on the central region of Active Galactic Nuclei (AGNs). Particularly we will focus on sources exhibiting absorption and/or emission features due to ionized, circumnuclear gas along the line of sight, the so-called "Warm Absorber". We will show how fine X-ray spectroscopy and available accurate atomic data are crucial to infer most of the physical and geometrical parameters of "Warm Absorber" in different types of AGN: density, temperature, ionization process (photo-ionization and/or collisional ionization), ionization range (cold/warm/hot medium), column density, turbulent velocity, outflow or inflow velocity, etc. A statistical study of the physical parameters of the Warm Absorber is indeed essential to probe unified and/or evolution schemes in AGNs.
Dubau Jacques
Porquet Delphine
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