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Article
Neutral Hydrogen Clouds in the M81/M82 Group
Astronomical Journal (2008)
  • Katie M Chynoweth, Vanderbilt University
  • Glen I Langston
  • Min S. Yun, University of Massachusetts - Amherst
  • Felix J Lockman
  • K H R Rubin
  • Sarah A Scoles
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.
Keywords
  • galaxies,
  • clusters,
  • individual (M81),
  • galaxies,
  • interactions,
  • radio lines: galaxies,
  • surveys
Publication Date
April 24, 2008
Publisher Statement
doi:10.1088/0004-6256/135/6/1983
Citation Information
Katie M Chynoweth, Glen I Langston, Min S. Yun, Felix J Lockman, et al.. "Neutral Hydrogen Clouds in the M81/M82 Group" Astronomical Journal Vol. 135 Iss. 6 (2008)
Available at: http://works.bepress.com/min_yun/43/