The high-energy astrophysics group studies accretion-powered high-energy sources such as neutron stars and black holes as well as gamma-ray bursts. Our strength is the combination of observational and theoretical research. We are actively involved in the analysis of the data on accreting black holes (stellar-mass and supermassive), accreting millisecond and X-ray pulsars, ultraluminous X-ray sources, and diffuse Galactic emission obtained with the X-ray and gamma-ray observatories RXTE, XMM-Newton, INTEGRAL, and Fermi. We also develop theoretical models for boundary layers around neutron stars and super-Eddington accretion disks around black holes. We have pioneered theoretical modelling of the light curves from rapidly rotating neutron stars and have developed state-of-the-art computer code for modelling the radiative processes in relativistic plasmas. We have proposed a novel particle acceleration mechanism-"photon breeding"-operating is relativistic jets emanating from active galactic nuclei. We have discovered that the breaks observed at a few GeV by Fermi in powerful blazars are produced by photon-photon annihilation on He II Lyman continuum, prooving thus for the first time that the blazar gamma-ray emitting region lies within high-ionization zone of the broad-line region.

Working groups

X-ray binaries

Description of the group activity.
Group meetings take place on Wednesdays (first and third of each month), 15.00 in the coffee room.

Stellar explosions

Description of the group activity.
Group meetings take place on Mondays, 15.00 in the coffee room.

AGNs and Very High Energy Astrophysics

Description of the group activity.
Group meetings take place on Wednesday (second and fourth of each month), 15.00 in the coffee room.