Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..175r&link_type=abstract
Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 175-182. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
18
Astronomical Models, Galactic Rotation, Mass Distribution, Astrometry, Brightness, Density Distribution, Galactic Structure, Optical Measuring Instruments, Radial Velocity, Radio Probing, Velocity Measurement
Scientific paper
By combining radial velocity data of optical and radio measurements, a well determined rotation curve of M 81 extending from the center to a distance of about 30 kpc has been constructed that shows two maxima located at R equals 6.5 kpc. A mass model for M 81 has been constructed which consists of a spherical bulge and a disk that can reproduce both peaks of the observed rotation curve of this system. The radial density distribution of the bulge component is found to have a rather sharp cutoff, and the disk component has a depression of the surface mass density near the center. The mathematical background for the convenient construction of exponential disk models with central depressions is given, and nongravitational effects in the interpretation of the rotation curve are discussed.
Kreitschmann J.
Rohlfs Kristen
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