The H I distribution in an extremely faint dwarf irregular galaxy M81 dwA

Details The H I distribution in an extremely faint dwarf irregular galaxy M81 dwA The H I distribution in an extremely faint dwarf irregular galaxy M81 dwA

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..711s&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 711-715. NSF-supported research.

Astronomy and Astrophysics

Astronomy

56

Dwarf Galaxies, Hydrogen Clouds, Interstellar Gas, Radio Sources (Astronomy), Brightness Temperature, Galactic Structure, Radial Velocity, Red Shift

Scientific paper

The distribution of neutral hydrogen in the extremely faint, dwarf, irregular galaxy M81 dwA is investigated by means of synthesis radio telescopy. H I is found to be distributed around the optical object in a lumpy, flattened ring, and the H I distribution major axis of 2 kpc diameter has essentially the same orientation as the optical major axis. The H I observations studied suggest that M81 dwA consists of a lumpy H I annulus which may be supported by turbulent motions in the gas rather than by rotation. The B-V color and a negative optical search for H-beta emission from the optical object imply that there has been no recent overall star formation in the galaxy.

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