Serbia, Andrevlje April 24-28, 2012.

Organized by Serbian Astronomical Society (http://www.das.org.rs/)

Co-organizer: Astronomical Observatory, Belgrade (http://www.aob.rs)

Supported by: Alexander von Humboldt foundation (http://www.avh.de/web/home.html)

Ministry of education and science of R. Serbia (http://www.mpn.gov.rs)

The aim: The 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.

The format of the workshop: The workshop is planned to have five invited lectures, devoted to the special theme based on spectroscopy of AGN and gravitational lenses.

Then work on the special mini-projects will be during whole day. 

The idea is to start, continue and finish some mini-projects (which will be published in international astronomical journals) during the workshop.

Scientific Organizing Committee

L. C. Popovic (Astronomical Observatory, Belgrade, Serbia) - Chairman
Wolfram Kollatschny (Institute for Astrophysics, University of Goettingen, Germany) - Co-chairman 

Emmanuel Danezis (Faculty of Physics, University of Athens, Greece)
Milan S. Dimitrijevic (Astronomical Observatory, Belgrade, Serbia)
Martin Gaskell (Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Chile)
Dragana Ilic (Faculty of Mathematics, University of Belgrade, Serbia)
Andjelka Kovaceivic (Faculty of Mathematics, University of Belgrade, Serbia)
Evencio Mediavilla (Instituto de Astrofísica de Canarias, Observatorio del Teide, Spain)
Piero Rafanelli (Dipartimento di Astronomia, Universita di Padova, Italy)
Alla Shapovalova (Special Astrophysical Observatory, Russian Academy of Science, Russia)
Sasa Simic (Faculty of Sciences, University of Kragujevac, Serbia)
Zoran Simic (Astronomical Observatory, Belgrade, Serbia)

Local Organizing Committee

Marko Stalevski (Astronomical Observatory, Belgrade, Serbia) - Chairman

Jelena Kovacevic (Astronomical Observatory, Belgrade, Serbia)
Dragana Ilic (Faculty of Mathematics, Belgrade, Serbia)
Andjelka Kovacevic (Faculty of Mathematics, Belgrade, Serbia)
Zoran Simic (Astronomical Observatory, Belgrade, Serbia)
Sasa Simic (Faculty of Sciences, University of Kragujevac, Serbia)