SIMBAD references

2007ApJ...656L..13I - Astrophys. J., 656, L13-L16 (2007/February-2)

Discovery of an unusual dwarf galaxy in the outskirts of the Milky Way.

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.Jr, 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. and SNEDDEN S.A.

Abstract (from CDS):

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 M☉and radial velocity +35 km/s 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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Journal keyword(s): Galaxies: Dwarf - galaxies: individual (Leo) - Galaxies: Local Group

Simbad objects: 6

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