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Astron. Astrophys. 330, 412-418 (1998)


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Central regions of the polar-ring galaxies NGC 2685 and IC 1689 *

O.K. Sil'chenko 1, 2

1 Sternberg Astronomical Institute, University av. 13, Moscow 119899, Russia
2 Isaac Newton Institute, Moscow Branch

Received 2 June 1997 / Accepted 12 September 1997

Abstract

Results of two-dimensional spectroscopy for central parts of polar-ring galaxies NGC 2685 and IC 1689 are presented. An orthogonality of star and gas rotations is detected. A strong break of absorption-line index Mgb between the nuclei and the inner bulges ("chemically decoupled nuclei") and perhaps an intermediate age of the stellar population in the nucleus of IC 1689 imply secondary star formation bursts in the centers of the polar-ring galaxies which are possibly related to accretion events having produced polar rings themselves.

Key words: galaxies: NGC 2685; IC 1689; nuclei; stellar content; kinematics and dynamics

* Based on observations collected with the 6m telescope of the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences (RAS) which is operated under the financial support of Science Department of Russia (registration number 01-43).

Send offprint requests to: O.K. Sil'chenko

© European Southern Observatory (ESO) 1998

Online publication: January 16, 1998
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