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28 March 2024 |
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Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way | M.J. Irwin
; V. Belokurov
; N.W. Evans
; E.V. Ryan-Weber
; J.T.A. de Jong
; S. Koposov
; D.B. Zucker
; S.T. Hodgkin
; G. Gilmore
; P. Prema
; L. Hebb
; A. Begum
; M. Fellhauer
; P.C. Hewett
; R.C. Kennicutt, Jr.
; M.I. Wilkinson
; D.M. Bramich
; S. Vidrih
; H.-W. Rix
; T.C. Beers
; J.C. Barentine
; H. Brewington
; M. Harvanek
; J. Krzesinski
; D. Long
; A. Nitta
; S.A. Snedden
; | Date: |
5 Jan 2007 | Abstract: | In this Letter, 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 about 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 of 200 Myr. There is a compact cloud of neutral hydrogen with mass roughly 10^5 solar masses 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. | Source: | arXiv, astro-ph/0701154 | Services: | Forum | Review | PDF | Favorites |
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