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The rotation curve and geometry of M 31 at large galactocentric distances.
Abstract
view Abstract Citations (218) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The rotation curve and geometry of M31 at large galactocentric distances. Roberts, M. S. ; Whitehurst, R. N. Abstract New 21-cm observations of the southern end of M3l indicate (1) that the plane of H I is bent away from the conventional plane by up to 5 kpc and (2) 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 > 200 for this outer region. At 30 kpc the surface density is 50 M0 pc-2. Dwarf M stars, the most common type of star in the solar vicinity, of number density of a few tenths pc - are adequate to explain the required mass and the mass-to-luminosity ratio. At these distances H I is 1 percent of the total mass. Subject headings: galaxies, individual - galaxies, motions in - galaxies, stellar content of - 21-cm radiation Publication: The Astrophysical Journal Pub Date: October 1975 DOI: 10.1086/153889 Bibcode: 1975ApJ...201..327R full text sources ADS | data products SIMBAD (1) NED (1)
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Citations
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Metadata
- Authors
- Roberts, M. S., & Whitehurst, R. N.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1975-10
- Volume
- 201
- Pages
- 327
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2003955655
- Cited by
- 183
- References
- 0
- FWCI
- 9.78
- Type
- journal article
- Language
- en
- Open access
- closed
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- Roberts, M. S., & Whitehurst, R. N. (1975). The rotation curve and geometry of M 31 at large galactocentric distances. The Astrophysical Journal. https://doi.org/10.1086/153889
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