Rotation curve and geometry of M31 at large galactocentric distances
Journal Article
·
· Astrophys. J., v. 201, no. 2, pp. 327-346
OSTI ID:4098912
New 21-cm observations of the southern end of M31 indicate that the plane of H i is bent away from the conventional plane by up to approx.5 kpc and that the rotational velocity is essentially constant over the outer 10 kpc, i.e., from 20 to 30 kpc radius. The latter implies a mass that increases linearly with R over this range and a mass-to-luminosity ratio of approximately-greater-than200 for this outer region. At 30 kpc the surface density is approx.50 M/sub sun/ pc$sup -2$. Dwarf M stars, the most common type of star in the solar vicinity, of number density of a few tenths pc$sup -3$ are adequate to explain the required mass and the mass-to-luminosity ratio. At these distances H i is approx.1 percent of the total mass. (AIP)
- Research Organization:
- National Radio Astronomy Observatory, Green Bank, West Virginia
- NSA Number:
- NSA-33-018182
- OSTI ID:
- 4098912
- Journal Information:
- Astrophys. J., v. 201, no. 2, pp. 327-346, Journal Name: Astrophys. J., v. 201, no. 2, pp. 327-346; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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