Other
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299...59c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. 59-73.
Other
98
Astronomical Photometry, Galactic Structure, Mass To Light Ratios, Spiral Galaxies, Dwarf Galaxies, Galactic Rotation, Hydrogen Clouds, Magnitude, Mass Distribution
Scientific paper
Studies of the light and mass distribution of the nearby Magellanic-type spiral NGC 3109 using surface photometry, optical Fabry-Perot, and H I observations are presented. The galaxy exhibits a very regular luminosity profile and, due to the low surface brightness of its disk, an absolute magnitude of -16.84. This value is in close agreement with the one derived from the Tully-Fisher relation. Models for the mass distribution are constructed from the surface photometry and the Fabry-Perot and H I kinematical data. The one-component disk model fails completely to fit the observed rotation curve, while a very good fit at all radii is obtained by adding a dark isothermal halo with core radius of 10.5 kpc and a one-dimensional velocity dispersion of 40 km/s. These parameters become 13.0 kpc and 40 km/s if the H I is distributed as proposed by Huchtmeier, Seiradakis, and Materne (1980), giving a central density for the dark halo of 0.0016 solar mass/cu pc.
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