Presentation 1 : Oral
X-ray spectroscopy as a very powerful tool to the
study of ionized me
Delphine Porquet & Jacques Dubau
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.