A Faint New Milky Way Satellite in Bootes

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-defin...

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Veröffentlicht in:	The Astrophysical journal 2006-08, Vol.647 (2), p.L111-L114
Hauptverfasser:	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
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Earth, ocean, space Exact sciences and technology
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Zusammenfassung:	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.
ISSN:	1538-4357 0004-637X 1538-4357
DOI:	10.1086/507324