The HI distribution in an extremely faint dwarf irregular galaxy M 81dwA.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1983
- DOI:
- 10.1086/160715
- Bibcode:
- 1983ApJ...265..711S
- Keywords:
-
- Dwarf Galaxies;
- Hydrogen Clouds;
- Interstellar Gas;
- Radio Sources (Astronomy);
- Brightness Temperature;
- Galactic Structure;
- Radial Velocity;
- Red Shift;
- Astrophysics