According to the most popular cosmological paradigm, the greater part
of the galaxy mass is accumulated in the dark matter halo. The mass
value can be measured in terms of various model assumptions, analyzing
the available observational data, for example, the distribution of the
rotation velocity at large distances from the center (the rotation curve).
It is much more difficult to make an estimate of the shape of the dark
halo in a particular galaxy, i.e. to understand whether it is spherical,
flattened or triaxial.
SAO researchers have discovered that supercritical accretion disks eject
hot gas with a velocity of a few thousand kilometers per second.
The supercritical regime of accretion onto black holes is very important
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.
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.