your ID: 0038 
First Name: Luka 
Last Name: Popovic 
Affiliation: Astronomical Observatory 
Title: Investigation of the innermost part of Active Galactic Nuclei by gravitational microlensing 
Authors: L. C. Popovic, P. Jovanovic, T. Petrovic 
Topic: 2 
Session: oral 
Abstract: Gravitational microlensing can be a very useful tool for investigation of the unresolved 
central part of lensed quasars (X-ray region, continuum source and broad line region) . 
Gravitational lensing is in general achromatic, however, the 
wavelength-dependent geometry of the different emission regions of lensed quasars may result in 
chromatic effects. Since sizes of the emitting regions are wavelength-dependent, microlensing 
by stars in the lens galaxy will lead to a wavelength-dependent magnification (Popovic & 
Chartas 2005, MNRAS, 357, 135). This can be used in the investigation of the size and geometry 
of emission regions (see e.g. Popovic et al. 2001, A&A, 378, 295; Abajas et al. 2002, ApJ, 576, 
640; Popovic et al. 2003, A&A, 398, 975; Popovic et al. 2006, ApJ, 637, 620). Here we will 
discuss the influence of gravitational microlensing on the spectra of lensed quasars, and 
possible usage of this to investigate the innermost part of quasars.