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Structure and dynamics of the nuclear region of the spiral galaxy NGC 7217

Sil'chenko, O. K.; Zasov, A. V.

The gas velocities and brightness distribution in the inner region of NGC 7217 are analyzed. This galaxy has a regular axially symmetric shape with flocullent spiral arms that have a system of three distinct rings (outer, inner, and nuclear) - a structure that is rarely observed in the absence of a bar. Observations on the 6-m telescope of the Spe…

Young nuclei in elliptical galaxies

Sil'chenko, O. K.

Chemically distinct nuclei have been found in the three elliptical galaxies NGC 4564, NGC 4621, and NGC 5576. These nuclei are appreciably younger than the surrounding regions: in the nuclei of NGC 4564 and NGC 4621, the mean age of the stellar population is 8 billion years, and in NGC 5576, it is 3 billion years. Studies of the rotation of the st…