Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..990v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 3, p. 990-1001
Astronomy and Astrophysics
Astronomy
45
Dwarf Galaxies, Galactic Halos, H I Regions, Luminosity, Mass To Light Ratios, Radio Observation, Sky Surveys (Astronomy), Star Formation, Brightness Distribution, Flux Density, Gas Density, Mass Distribution, Radio Astronomy
Scientific paper
H I mapping observations of a sample of isolated low luminosity galaxies were undertaken with the Arecibo 305 m telescope in order to determine the extent of their H I distribution. The sample included both compact emission-line galaxies (BCDs) and galaxies with hydrogen mass to-blue luminosity ratios, MH/LB, greater than five. Of 78 targeted galaxies, 49 were found to have extended H I envelopes. Whereas most (25 of 41) of the BCDs are compact in both optical light and in H I, 29 of the 33 high MH/LB galaxies has some evidence of extended hydrogen. As a class, the high MH/LB galaxies are low luminosity, low optical surface brightness, gas-rich dwarfs. Their extreme values of MH/LB and large H I extent make them similar to H I 1225+01 and I Zw 18, but the possibility that the high MH/LB galaxies are BCDs in a quiescent phase is still unresolved.
Giovanelli Riccardo
Haynes Martha P.
van Zee Liese
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