A Faint New Milky Way Satellite in Bootes

• DOI: 10.1086/507324
• Publication Date: 2006-08-16T20:56:31Z
• Authors: V. Belokurov; D. B. Zucker; N. W. Evans; M. I. Wilkinson; M. J. Irwin; S. Hodgkin; D. M. Bramich; J. M. Irwin; G. Gilmore; B. Willman; S. Vidrih; H. J. Newberg; R. F. G. Wyse; M. Fellhauer; P. C. Hewett; N. Cole; E. F. Bell; T. C. Beers; C. M. Rockosi; B. Yanny; E. K. Grebel; D. P. Schneider; R. Lupton; J. C. Barentine; H. Brewington; J. Brinkmann; M. Harvanek; S. J. Kleinman; J. Krzesinski; D. Long; A. Nitta; J. A. Smith; S. A. Snedden
• Keywords: Satellite galaxy; Red-giant branch; Local Group

In this Letter, we announce the discovery of a new satellite Milky Way in constellation Bootes at distance 60 kpc. It was found systematic search for stellar overdensities North Galactic Cap using Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The color-magnitude diagram shows well-defined turn-off, red giant branch, and extended horizontal branch. Its absolute magnitude is -5.8, which makes it one faintest galaxies known. half-light radius 220 pc. isodensity contours are elongated have an irregular shape, suggesting that Boo may be disrupted dwarf spheroidal galaxy.