HI and Hot Gas in the Outskirts of the M81 Group

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dc.creatorBureau, M.
dc.creatorWalter, F.
dc.creatorvan Gorkom, J.
dc.creatorCarignan, C.
dc.date2003-11-24
dc.date.accessioned2026-07-07T02:11:20Z
dc.date.available2026-07-07T02:11:20Z
dc.descriptionResults are presented from a wide area, high resolution HI synthesis survey of the outer regions of the nearby M81 group, where internal (galactic) and external (group-related) evolution processes can be studied simultaneously in great detail. The survey encompasses the star forming dwarf galaxies M81dwA, UGC4483, and HoII, where evidence of ram pressure stripping was recently discovered. The data do not reveal any intergalactic HI, but the outer parts of HoII are reminiscent of tidal tails. We argue however that those structures are equally consistent with the latest ram pressure models including cooling. The case for a hot intergalactic medium in this poor, spiral-only group is thus still open. The survey also puts tight constraints on possible counterparts to the local high velocity cloud population in an external group, reaching a 3 sigma column density of 10^19 atom/cm^2 and a 6 sigma limiting mass of 1.5x10^5 M_sun.
dc.description6 pages, 3 figures, to be published in "Recycling Intergalactic and Interstellar Matter," eds. P.-A. Duc, J. Braine, & E. Brinks (ASP: San Francisco)
dc.identifierhttps://arxiv.org/abs/astro-ph/0311539
dc.identifierhttp://arxiv.org/abs/astro-ph/0311539
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7042
dc.subjectAstrophysics
dc.titleHI and Hot Gas in the Outskirts of the M81 Group
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