 |
|
|
|||||||||
A research of color characteristics of stellar systems for a number of host galaxies in binary radiosources with steep type-FRIII spectra from the RC catalogue was carried out. It was determined that at least in some galaxies an active star formation process had begun during the first billion years after the Big Bang. This sample proved to be the deepest one of all the analogous samples by the highest redshift estimates. One such galaxy has the oldest age of all the objects of such type registered up to date.
Multicolor observations of a full sample of 140 nearby northern sky galaxies with radial velocities not exceeding 500km/s have been completed at the BTA telescope equipped with a CCD camera. More than 70% of dwarf galaxies from the sample were resolved into stars. For the majority of objects the distances to galaxies are measured by their brightest stars. The first map of peculiar velocities (non-Hubble velocities) is built for the Local group of galaxies.
Based on the results of optical and radio observations of a sample of
100 blue dwarf compact galaxies with the telescopes in the SAO RAS,
France and USA the estimates of a total dynamic mass and the ratio
of dark halo mass to the mass of the whole luminous matter were obtained.
It was found that the magnitude of this ratio varies from very small
values to 10. The analysis of this situation implies that dwarf galaxies
were formed by two essentially different mechanisms - by the traditional
one, that is, from initial density perturbations, and by the others -
from massive galaxies in process of their interaction.
(In cooperation with the Meudon Observatory, France and the University
of Virginia, USA)
For three nearby Seyfert galaxies, applying the 2D spectrometry method at the 6-m BTA telescope and the 4-m Kitt Peak telescope it was shown that the morphology and kinematics of the ionized gas subsystems are consistent with the hypothesis that the three dimensional spiral structure is present on the surface of the cone of matter, outflowing from the active nucleus. The emission of gas in this three-dimensional structure explains the observed quasi-spiral and Z-like structures in these galaxies. The obtained data do not contradict the fact that this outflow takes place in the galactic disk plane along the direction of elongation of the inner galactic bar. The angular resolution achieved by applying the methods of image reconstruction is 0.3-0.4", what is enough for making comparisons of the morphological structure with the data obtained at the Hubble Space Telescope.
|
Archive