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Title:
Neutral Hydrogen Clouds in the M81/M82 Group
Authors:
Chynoweth, Katie M.; Langston, Glen I.; Yun, Min S.; Lockman, Felix J.; Rubin, K. H. R.; Scoles, Sarah A.
Affiliation:
AA(Vanderbilt University, Physics and Astronomy Department, 1807 Station B, Nashville, TN 37235, USA ; Graduate Summer Research Assistantship Program at NRAO. ), AB(National Radio Astronomy Observatory, Green Bank, WV 24944, USA ), AC(University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01002, USA ), AD(National Radio Astronomy Observatory, Green Bank, WV 24944, USA ), AE(National Radio Astronomy Observatory, Green Bank, WV 24944, USA ; Research Experience for Undergraduates at NRAO. Present address: UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA. ), AF(National Radio Astronomy Observatory, Green Bank, WV 24944, USA ; Research Experience for Undergraduates at NRAO. Present address: Cornell Space Sciences Building, Cornell University, Ithaca, NY 14853, USA.)
Publication:
The Astronomical Journal, Volume 135, Issue 6, pp. 1983-1992 (2008). (AJ Homepage)
Publication Date:
06/2008
Origin:
IOP
AJ Keywords:
galaxies: clusters: individual: M81, galaxies: interactions, radio lines: galaxies, surveys
DOI:
10.1088/0004-6256/135/6/1983
Bibliographic Code:
2008AJ....135.1983C

Abstract

We have observed a 3° × 3° area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope in a search for analogs to the high-velocity clouds of neutral hydrogen found around our Galaxy. The velocity range from 605 to 85 km s-1 and from 25 to 1970 km s-1 was searched for H I clouds. Over the inner 2° × 2° the 7σ detection threshold was 9.6 × 105 M sun. We detect five previously unknown H I clouds associated with the group, as well as numerous associated filamentary H I structures, all lying in the range 105 <= V helio <= +280 km s-1. From the small angular distance of the clouds to group members, and the small velocity difference between group members and clouds, we conclude that the clouds are most likely relics of ongoing interactions between galaxies in the group.
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