Astronomers of the SAO together with an international group of scientists
have proposed an explanation to the long-standing
mystery of why magnetic fields are more common amongst cool white dwarf
stars than amongst young and hotter ones.
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.