Giant Cyclones in Gaseous Discs of Spiral Galaxies

We report detection of giant cyclonic vortices in the gaseous disc of the spiral galaxy NGC 3631 in the reference frame rotating with the spiral pattern. A presence of such structures was predicted by the authors for galaxies, where the radial gradient of the perturbed velocity exceeds that of the rotational velocity. This situation really takes place in NGC 3631.Comment: 13 pages, 4 EPS and 3 PS figure

The Structure of Galaxies and their Nuclear Activity

The structure of active galaxies is related to the activity of their nuclei. The activity of galaxies is known to be caused by the processes occurring in their central regions with sizes of less than 10 pc, luminosities of 1044 erg/s (exceeding by 3–4 orders of magnitude the typical values for normal galaxies), and masses not exceeding 1% of the total galactic mass.</jats:p

A Deep Spectral Survey on the 6-Meter Telescope

The observational program “Deep spectral survey of the selected sky areas” on the 6-meter telescope is described. Preliminary results for the central part of field SA57 are discussed. The spectrum of a QS0 with probable redshift z=3.87 is presented. The number of quasars per sq. degree is estimated to be 470–675 to B &lt; 23 mag., which gives the same slope in the increasing number of QSOs with magnitude as in brighter samples.</jats:p