Main subject of the meeting is devoted to the
physics of warm absorber in active galactic nuclei (AGN).
The warm absorber became a hot topic since
the new generations of X-ray satellites
(Chandra XMM-Newton) came into use. We see great amount of absorption
and emission lines
in 90% of AGN. The resolution of satellites allows us to determine
line profiles and so on velocities of absorbing matter, which is
most probably outflowing. However, the estimates of the outflow rate,
the cause of this outflow and its geometry are highly uncertain since
they are model-dependent. Some estimates suggest that the amount of
outflow is comparable to the total accretion rate so the phenomenon
is essential for our understanding of the AGN activity.
We plan to discuss physical conditions and origin of the warm absorber
in different types of AGN. We will compare the results of various
approaches to modelling the warm absorber, make a list of issues to be
solved, and we will discuss the most effective approach to data
analysis which would help to constrain the models.