|
|
SCIENTIFIC
RATIONALE
Investigation of nature of the emitting ionized gas in galactic nuclei is one of important subjects in astrophysics today. Firstly, investigating the
processes in the central parts of these objects, we can learn about the innermost parts of other 'normal' galaxies. Secondly, AGN are the most
powerful sources, located at different cosmological time-scales, and their investigation is cosmologically important. Finally, a part of emission from these
objects (e.g. in the X-rays) has its origin very close to a massive black hole, and investigation of this emission can help us understand the physical processes
in a strong gravitational field. On the other side, a number of AGN are affected by gravitational lensing effect.
Gravitational lensing is in general achromatic: the deflection angle of a light ray does not depend on its wavelength. However, the wavelength-dependent
geometry of the various emission regions may result in chromatic effect. Studies aimed at determining the influence of microlensing on spectra of
lensed quasars (hereafter QSOs) ought to account for the complex structure of the QSO central emitting region. Since the sizes of the emitting regions
are wavelength-dependent, microlensing by stars in a lens galaxy will lead to a wavelength-dependent magnification.
Many interesting details about the physics of processes that are taking place within AGN can be identified in the signal of their emitting regions
(as e.g. Broad Line Region - BLR), but they suffer from a still missing complete picture of the complex kinematical and thermodynamical properties of the line
emitting plasma. Since it is not yet possible to directly observe the spatial distribution of the broad line emitting medium, al though many important achievements
were obtained in the angular resolution of AGN cores at radio wavelengths, spectroscopic data are still the most useful way to investigate physics
within the central part of an AGN.
|
