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Galaxy Interactions and Hi Clouds in Groups

Published online by Cambridge University Press:  17 September 2012

K.M. Chynoweth ,
K. Holley-Bockelmann ,
G.I. Langston  and
F.J. Lockman
K.M. Chynoweth
Affiliation:
Vanderbilt University Physics & Astronomy Department, 1807 Station B, Nashville, TN 37235, USA
K. Holley-Bockelmann
Affiliation:
Vanderbilt University Physics & Astronomy Department, 1807 Station B, Nashville, TN 37235, USA
G.I. Langston
Affiliation:
National Radio Astronomy Observatory, Green Bank, WV 24944, USA
F.J. Lockman
Affiliation:
National Radio Astronomy Observatory, Green Bank, WV 24944, USA
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Abstract

We present GBT neutral hydrogen observations of two nearby galaxy groups. The M 81/M 82 and NGC 2403 groups represent opposite ends of the range in intensity of galaxy interactions, and have remarkably different properties in Hi. We have discovered 5 new Hi clouds in the highly interacting M 81/M 82 group of galaxies. Based on the velocity and angular distributions of these clouds, we conclude that they are relics of ongoing interactions between galaxies in the group. In contrast, the non-interacting NGC 2403 galaxy group shows no signs of Hi clouds or faint, extended Hi. We also detect a compact Hi cloud at v = −205 km s−1, which we believe to be part of HVC Complex A. Our observations suggest that the number density of Hi clouds in galaxy groups is strongly correlated with the level and age of ongoing galaxy interactions in the group.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 275 - 279
Copyright
© EAS, EDP Sciences, 2012

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