Neutral Hydrogen Clouds in the M81/M82 Group
We have observed a 3 degree x 3 degree area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for analogs to the High Velocity Clouds (HVCs) of neutral hydrogen found around our galaxy. The velocity range from -605 to -85 km/s and 25 to 1970 km...
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Main Authors | , , , , , |
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Language | English |
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Abstract | We have observed a 3 degree x 3 degree area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for analogs to the High Velocity Clouds (HVCs) of neutral hydrogen found around our galaxy. The velocity range from -605 to -85 km/s and 25 to 1970 km/s was searched for HI clouds. Over the inner 2 degrees x 2 degrees the 7-sigma detection threshold was 9.6 x 10^5 M_sun. We detect 5 previously unknown HI clouds associated with the group, as well as numerous associated filamentary HI structures, all lying in the range -105 < V_helio < +280 km/s. 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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AbstractList | We have observed a 3 degree x 3 degree area centered on the M81/M82 group of
galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for
analogs to the High Velocity Clouds (HVCs) of neutral hydrogen found around our
galaxy. The velocity range from -605 to -85 km/s and 25 to 1970 km/s was
searched for HI clouds. Over the inner 2 degrees x 2 degrees the 7-sigma
detection threshold was 9.6 x 10^5 M_sun. We detect 5 previously unknown HI
clouds associated with the group, as well as numerous associated filamentary HI
structures, all lying in the range -105 < V_helio < +280 km/s. 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. We have observed a 3 degree x 3 degree area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for analogs to the High Velocity Clouds (HVCs) of neutral hydrogen found around our galaxy. The velocity range from -605 to -85 km/s and 25 to 1970 km/s was searched for HI clouds. Over the inner 2 degrees x 2 degrees the 7-sigma detection threshold was 9.6 x 10^5 M_sun. We detect 5 previously unknown HI clouds associated with the group, as well as numerous associated filamentary HI structures, all lying in the range -105 < V_helio < +280 km/s. 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. |
Author | Langston, Glen I Chynoweth, Katie M Yun, Min S Lockman, Felix J Rubin, K H R Scoles, Sarah A |
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BackLink | https://doi.org/10.1088/0004-6256/135/6/1983$$DView published paper (Access to full text may be restricted) https://doi.org/10.48550/arXiv.0803.3631$$DView paper in arXiv |
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Snippet | We have observed a 3 degree x 3 degree area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for... We have observed a 3 degree x 3 degree area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for... |
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SubjectTerms | Angular velocity Galaxies Hydrogen clouds Milky Way Galaxy Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics |
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Title | Neutral Hydrogen Clouds in the M81/M82 Group |
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