Rotational velocities in the nuclear bulge of M 31.
Abstract
Stellar radial velocities in the nuclear bulge of M31 have been measured, using a tilting interference filter scanner at the H and K lines of Ca II. Along the minor axis, where the measurements extend to a projected distance of 3 arc min or 600 pc from the nucleus, there is no evidence for radial velocities in excess of 20 km/s. Along the major axis the measured rotational velocities are symmetric about the nucleus and appear to rise gradually over the the inner 4 arc min or 3 core radii to a value of 85 plus or minus 16 km/s. This rotation rate appears to be sufficient to account for the observed flattening of the nuclear bulge.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1980
- DOI:
- 10.1086/157605
- Bibcode:
- 1980ApJ...235...30R
- Keywords:
-
- Andromeda Galaxy;
- Elliptical Galaxies;
- Galactic Bulge;
- Galactic Nuclei;
- Galactic Rotation;
- Radial Velocity;
- Stellar Motions;
- Astronomical Models;
- Astronomical Photography;
- Astronomical Photometry;
- Brightness;
- Dynamic Models;
- Globular Clusters;
- Velocity Measurement;
- Astrophysics