Neutral Hydrogen Clouds in the M81/M82 Group
arXiv:0803.3631 · doi:10.1088/0004-6256/135/6/1983
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.
17 pages, 5 figures, AJ accepted
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Cited by in corpus (71)
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- Sensitive 21cm Observations of Neutral Hydrogen in the Local Group near M31
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- Stellar population and structural properties of dwarf galaxies and young stellar systems in the M81 group
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- Searching for MgII absorbers in and around galaxy clusters
- Disentangling the multi-phase circumgalactic medium shared between a dwarf and a massive star-forming galaxy at z~0.4
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- HI Clouds in the M81 Filament as Dark Matter Minihalos--A Phase-Space Mismatch
- The Origin of Neutral Hydrogen Clouds in Nearby Galaxy Groups: Exploring the Range Of Galaxy Interactions
- Mapping the Thermal Condensation of Diffuse H I in the North Celestial Pole Loop
- GHOSTS I: A New Faint very Isolated Dwarf Galaxy at D = 12 +/- 2 Mpc
- Circumgalactic gas at its extreme: tidal gas streams around the Whale galaxy NGC 4631 explored with HST/COS
- Seeking large-scale magnetic fields in a pure-disk dwarf galaxy NGC 2976
- The Circumgalactic Medium in Massive Halos
- A Search for Intergalactic Globular Clusters in the Local Group
- Search for the Gamma-ray Emission from M33 with Fermi LAT
- A 5deg x 5deg deep HI survey of the M81 group: II. HI distribution and kinematics of IC 2574 and HIJASS J1021+68
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- A new delivery route to Galactic Nuclei: Warm halo cloud impacts
- Prospects of newly detecting nearby star-forming galaxies by the Cherenkov Telescope Array
- The diffuse extragalactic gamma-ray background radiation: star-forming galaxies are not the dominant component
- Satellites in the Local Group and Other Nearby Groups
- Neutral Gas Accretion onto Nearby Galaxies
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