H I and mass distribution in the dwarf regular galaxy UGC 2259
The paper presents a study of the H I and mass distribution for the dwarf regular galaxy UGC 2259. The H I content of UGC 2259 is typical of that found in more luminous Scd galaxies. The distribution of H I surface densities is shown to be constant out to about D(25) before starting to decrease. The H I velocity field is regular; no systematic variation of the orientation parameters with radius is found. The shape of this galaxy's rotation curve is similar to that seen in more luminous spirals while the rotational velocities on the rising branch coincide with those predicted for a low-luminosity Sc spiral. To reproduce the observed rotation curve, a minimum isothermal halo with sigma = 55 km/s and r(c) = 5.5 kpc must be added to the stellar disk. 31 references.
- Research Organization:
- Observatoire du Mont Megantic, Montreal (Canada); Groningen Rijksuniversiteit (Netherlands)
- OSTI ID:
- 5293445
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 95; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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