A Faint New Milky Way Satellite in Bootes

  title={A Faint New Milky Way Satellite in Bootes},
  author={Vasily A Belokurov and Db B. Zucker and N. Wyn Evans and Mark I. Wilkinson and Michael Irwin and Simon T. Hodgkin and Daniel M. Bramich and Jonathan M. Irwin and Gerry Gilmore and Beth Willman and Simon Vidrih and Heidi Jo Newberg and R. F. G. Wyse and Michael Fellhauer and Paul C. Hewett and Nathan Cole and Eric F. Bell and Timothy C. Beers and Constance M. Rockosi and Brian Yanny and E. K. Grebel and Donald P. Schneider and Robert H. Lupton and John C. Barentine and Howard J. Brewington and Jonathan Brinkmann and Michael Harvanek and Scott J. Kleinman and Jurek Krzesinski and Daniel C. Long and Atsuko Nitta and J. Allyn Smith and Stephanie A. Snedden},
  journal={The Astrophysical Journal Letters},
  pages={L111 - L114}
We announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of ~60 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 MV ~ -5.8 mag, which makes it one of the faintest galaxies known. The half-light radius is ~220 pc. The… 

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