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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, Jr., 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
Astrophysical journal/The Astrophysical journal, 02/2007, Letnik: 656, Številka: 1Journal Article
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 10 super(5) M sub( )and radial velocity +35 km s super(-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.
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