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Date and Time of the Query: 2019-06-15 T14:34:11 PDT
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For refcode 2006AJ....131.2913B:
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Copyright by American Astronomical Society. Reproduced by permission
2006AJ....131.2913B Neutral Hydrogen Clouds Near Early-Type Dwarf Galaxies of the Local Group Antoine Bouchard, Claude Carignan, and Lister Staveley-Smith Abstract. Parkes neutral hydrogen 21 cm line (Hi) observations of the surroundings of nine early-type Local Group dwarfs are presented. We detected numerous H i clouds in the general direction of those dwarfs, and these clouds are often offset from the optical center of the galaxies. Although all the observed dwarfs, except Antlia, occupy phase-space regions where the high-velocity cloud (HVC) density is well above average, the measured offsets are smaller than one would expect from a fully random cloud distribution. Possible association is detected for 11 of the 16 investigated clouds, while for two galaxies, Sextans and Leo I, no H I was detected. The galaxies in which H I clouds were found not to coincide with the optical yet have a significant probability of being associated are the Sculptor dwarf, Tucana, LGS 3, Cetus, and Fornax. If the clouds are indeed associated, these galaxies have H I masses of M_HI_=2x10^5^, 2x10^6^, 7x10^5^, 7x10^5^, and 1x10^5^ M_sun_, respectively. However, neither ram pressure nor tidal stripping can easily explain the offsets. In some cases, large offsets are found where ram pressure should be the least effective. Key words: Galaxies: Dwarf, Galaxies: ISM, ISM: Clouds, Galaxies: Local Group, Radio Lines: Galaxies, Radio Lines: ISM
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