A fast bar in the post-interaction galaxy NGC 1023
Abstract
We measured the bar pattern speed, Ωp , of the SB0 galaxy NGC 1023 using the Tremaine-Weinberg method with stellar-absorption slit spectroscopy. The morphology and kinematics of the Hi gas outside NGC 1023 suggest it suffered a tidal interaction, sometime in the past, with one of its dwarf companions. At present, however, the optical disc is relaxed. If the disc had been stabilized by a massive dark matter halo and formed its bar in the interaction, then the bar would have to be slow. We found Ωp =5.0+/-1.8kms-1 arcsec-1 , so that the bar ends near its corotation radius. It is therefore rotating rapidly and must have a maximum disc.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 2002
- DOI:
- 10.1046/j.1365-8711.2002.05269.x
- arXiv:
- arXiv:astro-ph/0112288
- Bibcode:
- 2002MNRAS.332...65D
- Keywords:
-
- galaxies: elliptical and lenticular;
- cD;
- galaxies: haloes;
- galaxies: individual: NGC 1023;
- galaxies: interactions;
- galaxies: kinematics and dynamics;
- galaxies: photometry;
- Astrophysics
- E-Print:
- 13 pages, 10 figures. Accepted for publication at MNRAS