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

Journal Article · Tue Feb 15 00:00:00 EST 1983 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160715· OSTI ID:6302558

Sargent, W L.W.; Sancisi, R; Lo, K Y

We have used the Westerbork synthesis radio telescope to investigate the distribution of neutral hydrogen in an extremely faint, dwarf, irregular galaxy, M81 dwA, which was discovered by Lo and Sargent in a search for intergalactic H I clouds. M81 dwA has an absolute magnitude M/sub p/ roughly-equal-11.0 and an H I mass of 1.1 +- 0.1 x 10/sup 7/ M/sub sun/. The optical object has size 30'' x 60'', corresponding to 0.5 x 1.0 kpc/sup 2/ at the distance to the M81 group. Its heliocentric radial velocity is v = 113 +- 2 km s/sup -1/, consistent with group membership. M81 dwA lies 29' from Holmberg II; the difference in redshift between the two objects makes it unlikely that M81 dwA is a dynamical satellite of Holmberg II.

• Research Organization: Palomar Observatory and Owens Valley Radio Observatory, California Institute of Technology
• OSTI ID: 6302558
• Journal Information: Astrophys. J.; (United States), Vol. 265:2
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
H1 REGIONS
SPATIAL DISTRIBUTION
COSMIC RADIO SOURCES
INTERFEROMETRY
MORPHOLOGY
RED SHIFT
DISTRIBUTION
640105* - Astrophysics & Cosmology- Galaxies