The supercritical accretion regime is very important for astrophysics. In the first half-billion years just after our Universe was born, supermassive black holes (quasars) began to appear and grow in centers of young galaxies. More...

A unique set of linear polarization measurements in the spectrum of the Seyfert galaxy Mkn 6 was obtained with the 6-meter telescope. It was shown for the first time that the analysis of the polarization angle dependence on the velocity across the hydrogen line profiles due to the gas emission in the broad-line formation region near the massive AGN allows to determine directly from observations the type of motion in the broad-line formation region, which in the case of Mkn 6 turned out to be Keplerian at distances less than 0.02 pc from the nucleus. The lower mass limit determined for the supermassive black hole in the center of the Mkn 6 galaxy is equal to 150 million solar masses. More...

High spectral resolution echelle spectroscopy of supergiants at the post-ABG stage resulted in the formation of a sample of these objects possessing a high infrared excess, an emission at 21 μm, and also large overabundances of carbon and heavy metals, synthesized by the s-process at the preceding AGB stage. More...