Active Galactic Nuclei astrophysics: broad line region structure and kinematics, emission line profile modeling, black hole parameter determinations, variability models, unification schemes, X-ray emission, radio loudness.
Accretion disks: geometry, transition radii, accretion modes, stationarity, outflows, selfgravitation
Statistical methods in Astrophysics, low dimensional chaos
Rumen Bachev's Virtual Observatory (AGN CCD Archive)
- AGN spectroscopy; ground based and from space
- AGN continuum variability, short-term variations
- Variability in cataclysmic stars
- Observational techniques and code development