A Faint New Milky Way Satellite in Bootes
Astrophysics
2010-04-06 v2
Abstract
In this Letter, 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 (SDSS DR5). The color-magnitude diagram shows a well-defined turn-off, red giant branch, and extended horizontal branch. Its absolute magnitude is -5.8, which makes it one of the faintest galaxies known. The half-light radius is 220 pc. The isodensity contours are elongated and have an irregular shape, suggesting that Boo may be a disrupted dwarf spheroidal galaxy.
Cite
@article{arxiv.astro-ph/0604355,
title = {A Faint New Milky Way Satellite in Bootes},
author = {V. Belokurov and D. B. Zucker and N. W. Evans and M. I. Wilkinson and M. J. Irwin and S. Hodgkin and D. M. Bramich and J. M. Irwin and G. Gilmore and B. Willman and S. Vidrih and H. J. Newberg and R. F. G. Wyse and M. Fellhauer and P. C. Hewett and N. Cole and E. F. Bell and T. C. Beers and C. M. Rockosi and B. Yanny and E. K. Grebel and D. P. Schneider and R. Lupton and J. C. Barentine and H. Brewington and J. Brinkmann and M. Harvanek and S. J. Kleinman and J. Krzesinski and D. Long and A. Nitta and J. A. Smith and S. A. Snedden},
journal= {arXiv preprint arXiv:astro-ph/0604355},
year = {2010}
}
Comments
ApJ (Letters), in press