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Belokurov, V; Zucker, D. B; Evans, N. W; Wilkinson, M. I; Irwin, M. J; Hodgkin, S; Bramich, D. M; Irwin, J. M; Gilmore, G; Willman, B; Vidrih, S; Newberg, H. J; Wyse, R. F. G; Fellhauer, M; Hewett, P. C; Cole, N; Bell, E. F; Beers, T. C; Rockosi, C. M; Yanny, B; Grebel, E. K; Schneider, D. P; Lupton, R; Barentine, J. C; Brewington, H; Brinkmann, J; Harvanek, M; Kleinman, S. J; Krzesinski, J; Long, D; Nitta, A; Smith, J. A; Snedden, S. A
Astrophysical journal/The Astrophysical journal, 08/2006, Letnik: 647, Številka: 2Journal Article
We announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of 660 kpc. It was found in a systematic search for stellar overdensities in the north Galactic cap using Sloan Digital Sky Survey Data Release 5. The color-magnitude diagram shows a well-defined turnoff, red giant branch, and extended horizontal branch. Its absolute magnitude is M sub(v) 6 -5.8 mag, which makes it one of the faintest galaxies known. The half-light radius is 6220 pc. The isodensity contours are elongated and have an irregular shape, suggesting that Boo may be a disrupted dwarf spheroidal galaxy.
