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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 358723.0, MPI für Astronomie / Publikationen_mpia
Discovery of an unusual dwarf galaxy in the outskirts of the Milky Way
Authors:Irwin, M. J.; Belokurov, V.; Evans, N. W.; Ryan-Weber, E. V.; de Jong, J. T. A.; Koposov, S.; Zucker, D. B.; Hodgkin, S. T.; Gilmore, G.; Prema, P.; Hebb, L.; Begum, A.; Fellhauer, M.; Hewett, P. C.; Kennicutt, R. C.; Wilkinson, M. I.; Bramich, D. M.; Vidrih, S.; Rix, H. W.; Beers, T. C.; Barentine, J. C.; Brewington, H.; Harvanek, M.; Krzesinski, J.; Long, D.; Nitta, A.; Snedden, S. A.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Volume:656
Start Page:L13
End Page:L16
Audience:Not Specified
Abstract / Description:We announce the discovery of a new dwarf galaxy, Leo T, in the Local Group. It was found as a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The color-magnitude diagram of Leo T shows two well-defined features, which we interpret as a red giant branch and a sequence of young, massive stars. As judged from fits to the color-magnitude diagram, it lies at a distance of ~420 kpc and has an intermediate-age stellar population with a metallicity of [Fe/H] = -1.6, together with a young population of blue stars of age ~200 Myr. There is a compact cloud of neutral hydrogen with mass ~105 Msolar and radial velocity +35 km s-1 coincident with the object visible in the HIPASS channel maps. Leo T is the smallest, lowest luminosity galaxy found to date with recent star formation. It appears to be a transition object similar to, but much lower luminosity than, the Phoenix dwarf.
Free Keywords:Galaxies: Dwarf; galaxies: individual (Leo); Galaxies: Local Group
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi...
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