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Strangers in the night: Discovery of a dwarf spheroidal galaxy on its first Local Group infall

dc.contributor.authorChapman, S. C.en_US
dc.contributor.authorPenarrubia, J.en_US
dc.contributor.authorIbata, R.en_US
dc.contributor.authorMcConnachie, A.en_US
dc.contributor.authorMartin, N.en_US
dc.contributor.authorIrwin, M.en_US
dc.contributor.authorBlain, A.en_US
dc.contributor.authorLewis, G. F.en_US
dc.contributor.authorLetarte, B.en_US
dc.contributor.authorLo, K.en_US
dc.contributor.authorLudlow, A.en_US
dc.contributor.authorO'neil, K.en_US
dc.date.accessioned2014-03-12T19:21:07Z
dc.date.available2014-03-12T19:21:07Z
dc.date.issued2007-06-20en_US
dc.description.abstractWe present spectroscopic observations of the AndXII dwarf spheroidal galaxy using DEIMOS/Keck-II, showing it to be moving rapidly through the Local Group (-556 km/s heliocentric velocity, -281 km/s relative to Andromeda from the MW), falling into the Local Group from ~115 kpc beyond Andromeda's nucleus. AndXII therefore represents a dwarf galaxy plausibly falling into the Local Group for the first time, and never having experienced a dense galactic environment. From Green Bank Telescope observations, a limit on the H{I} gas mass of <3000 Msun suggests that AndXII's gas could have been removed prior to experiencing the tides of the Local Group galaxies. Orbit models suggest the dwarf is close to the escape velocity of M31 for published mass models. AndXII is our best direct evidence for the late infall of satellite galaxies, a prediction of cosmological simulations.en_US
dc.identifier.citationChapman, S. C., J. Penarrubia, R. Ibata, A. McConnachie, et al. 2007. "Strangers in the night: Discovery of a dwarf spheroidal galaxy on its first Local Group infall." The Astrophysical Journal 662(2): 79-L82en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.issue2en_US
dc.identifier.startpage79en_US
dc.identifier.urihttp://dx.doi.org/10.1086/519377en_US
dc.identifier.urihttp://hdl.handle.net/10222/45517
dc.identifier.volume662en_US
dc.titleStrangers in the night: Discovery of a dwarf spheroidal galaxy on its first Local Group infallen_US
dc.title.alternativeThe Astrophysical Journalen_US
dc.typearticleen_US

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