AAS 203rd Meeting, January 2004
Session 116 Elliptical and Spiral Galaxies
Poster, Thursday, January 8, 2004, 9:20am-4:00pm, Grand Hall

[116.24] Streams of Neutral Hydrogen in the M81 Group of Galaxies

K. H. R. Rubin (Yale University), G.I. Langston, F. Walter (NRAO)

The nearby M81/M82 group of galaxies is embedded in a cloud of neutral hydrogen that traces the history of the interaction between these galaxies. At ~3.5 Mpc the M81/M82 group is one of the closest groups.

A complete census of dwarf galaxies and high velocity clouds (HVCs) in the M81 group is important for understanding the mass distribution of this group. We set a 6{\sigma} detection limit for HI of 3\times106 M\odot. This study has relevance to studies of our own Galaxy/Local group. The exact location of HVCs surrounding our galaxy still remains a puzzle. Our observations show the M81/M82 group has connected streams of hydrogen, not isolated clouds.