Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..507l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 2, p. 507-529, 813-820.
Astronomy and Astrophysics
Astronomy
163
Brightness Temperature, Dwarf Galaxies, Faint Objects, Hydrogen Atoms, Star Formation, Very Large Array (Vla), Charge Coupled Devices, Data Reduction, H Ii Regions, Mass To Light Ratios
Scientific paper
Maps of the neutral atomic hydrogen (H I) in nine dwarf irregular galaxies, with absolute magnitude fainter than 14 m, which were made with the VLA at a typical resolution of less than about 18 arcsec and velocity resolution of 6 km/s during 1981.9 to 1983.2, are presented. These observations probe the internal motions and the interstellar medium in these faint galaxies, and provide a dynamical mass determination. The H I mass ranges between 2 x 10 exp 5 and 8 x 10 exp 7 solar masses. The H I column density distribution, which is clumpy on the 100 to 300 parsec scale, is generally not well correlated with the stellar distribution. Only two galaxies of the sample show a velocity gradient that may be due to rotation in the H I gas system; the velocity fields of the H I gas in these dwarf galaxies are dominated by chaotic motion rather than by rotation.
Lo Kwok Yung
Sargent Wallace L. W.
Young Kenneth K.
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