Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997azh....74..643s&link_type=abstract
Astronomicheskij Zhurnal, vol. 74, p. 643
Astronomy and Astrophysics
Astronomy
10
Elliptical Galaxies, Galactic Nuclei, Galactic Rotation, Chemical Composition, Radial Velocity, Star Distribution, Gas Dynamics, Magnesium, Hydrogen
Scientific paper
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 4465 and NGC 4621, the mean age of the stellar population is eight billion years, and in NGC 5576, it is three billion years. Studies of the rotation of the stellar component in the central regions of these galaxies revealed circular rotation in the main plane in NGC 4564 and NGC 4621; the asymmetric absorption line profiles and photometric structure of the nucleus in NGC 4621 indicates that there is a nuclear disk with dimensions 5-7 arcsec. In NGC 5576, the nucleus is the most compact and rotates in a plane perpendicular to the main plane of the galaxy. It is proposed that the difference in the structure of chemically distinct young nuclei in elliptical galaxies is due to the different angular momentum of the accreted gas that formed these nuclei.
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