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A Faint New Milky Way Satellite in Bootes

By V Belokurov, J C Barentine, T C Beers, E F Bell, D M Bramich, H Brewington, J Brinkmann, N Cole, N W Evans, M Fellhauer, G Gilmore, E K Grebel, M Harvanek, P C Hewett, S Hodgkin, J M Irwin, M J Irwin, S J Kleinman, J Krzesínski, D Long, R Lupton, H J Newberg, A Nitta, C M Rockosi, D P Schneider, J A Smith, S A Snedden, S Vidrih, M I Wilkinson, B Willman, R F G Wyse, B Yanny and D B Zucker

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 -5.7, which makes it fainter than the faintest galaxy known. The half-light radius is 220 pc. The isodensity contours are elongated and have an irregular shape

Topics: Astrophysics and Astronomy
Year: 2006
OAI identifier: oai:cds.cern.ch:942585
Provided by: CERN Document Server
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