Astron. Astrophys. 319, 430-434 (1997)

IC 1689: S0 galaxy with inner polar disk

V.A. Hagen-Thorn ¹ and V.P. Reshetnikov <sup>2

1</sup> St. Petersburg State University, 198904 St. Petersburg, Russia
² Astronomical Institute of St. Petersburg State University, 198904 St. Petersburg, Russia

Received 29 April 1996 / Accepted 22 July 1996

Abstract

The results of spectroscopic observations of the S0 galaxy IC 1689 are given. The radial velocity curves constructed from the measurements of H and [NII] 6583 lines show that in the galaxy interior there is a gas disk (r 3 kpc) rotating around the axis placed in the main plane of the galaxy (polar disk). Active star formation occurs in the outer part of the disk (in the ring). Both H and [NII] 6583 emission lines are observed here. Only collisionally excited [NII] radiates in the inner regions of the disk.

Key words: galaxies: IC 1689; kinematics and dynamics; interactions; peculiar; spectroscopy

Send offprint requests to: V.A. Hagen-Thorn

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations and reductions
• 3. Results
  • 3.1. Emission spectrum of the galaxy nucleus
  • 3.2. Absorption spectrum along the major axis of the galaxy
  • 3.3. Emission spectrum along the major axis of the inner elliptical structure
  • 3.4. Emission spectrum along the major axis of the galaxy
• 4. Discussion
• 5. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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