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Astron. Astrophys. 326, 941-949 (1997)

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Decoupled nuclei and nuclear polar rings
in regular spiral galaxies. NGC 2841 *

O.K. Sil'chenko 1, V.V. Vlasyuk 2 and A.N. Burenkov 2

1 Sternberg Astronomical Institute, University av. 13, Moscow 119899, Russia
2 Special Astrophysical Observatory, Nizhnij Arkhyz, Karachaj-Cherkess Republic, 357147 Russia

Received 14 October 1996 / Accepted 14 May 1997

Abstract

The Sb galaxy NGC 2841 was observed at the 6 m telescope of SAO RAS with the Multi-Pupil Field Spectrograph and at the 1 m telescope of SAO RAS with the long-slit spectrograph. An unresolved nucleus of NGC 2841 is shown to be chemically decoupled both in magnesium and in iron with abundance break estimates of 0.36 dex for Mg and 0.6 dex for Fe; an abundance gradient in the bulge is seen only in the magnesium index and is typical for early-type disk galaxies. The rotation axis of the nuclear ionized gas in NGC 2841 is perpendicular to that of the central stellar population; an existence of a bulge stellar component with decoupled rotation momentum in the radius range 5"-12" is suspected. A possible scenario for the origin of the unusual central structure in NGC 2841 is proposed.

Key words: galaxies: NGC 2841; nuclei; stellar content; structure; kinematics and dynamics; abundances

* 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

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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