Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1274l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Oct. 1989, p. 1274-1284. Research supported by the Robert A. Welch Foundation, U
Astronomy and Astrophysics
Astronomy
73
Dwarf Galaxies, Gravitation Theory, Irregular Galaxies, Local Group (Astronomy), Mass Distribution, Acceleration (Physics), Astronomical Maps, H Lines, Halos, Velocity Distribution
Scientific paper
Results are presented on the H I spectral-line distribution and velocity field of the Local Group dwarf galaxy IC 1613, which were obtained using VLA of the NRAO. The rotation curve of IC 1613 was determined, and Newtonian and non-Newtonian mass models were built. It was found that the H I is lumpy in the inner parts, but H I contours in the outer parts of the galaxy are smooth. The velocity field is regular, and the line of nodes is coincident with the major axis of the gas distribution. The rotation curve of IC 1613 shows evidence of dark matter in the outer parts. However, the maximum density of a dark halo that can be tolerated is an order of magnitude lower than that needed to explain the velocity dispersions of the extreme dwarf spheroidals.
Lake George
Skillman Evan D.
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