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25 April 2024

» arxiv » astro-ph/0604354

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A New Milky Way Dwarf Satellite in Canes Venatici
D. B. Zucker ; V. Belokurov ; N. W. Evans ; M. I. Wilkinson ; M. J. Irwin ; T. Sivarani ; S. Hodgkin ; D. M. Bramich ; J. M. Irwin ; G. Gilmore ; B. Willman ; S. Vidrih ; M. Fellhauer ; P. C. Hewett ; T. C. Beers ; E. F. Bell ; E. K. Grebel ; D. P. Schneider ; H. J. Newberg ; R. F. G. Wyse ; C. M. Rockosi ; B. Yanny ; R. Lupton ; J. A. Smith ; J. C. Barentine ; H. Brewington ; J. Brinkmann ; M. Harvanek ; S. J.Kleinman ; J. Krzesinski ; D. Long ; A. Nitta ; S. A. Snedden ;
Date:	17 Apr 2006
Journal:	Astrophys.J. 643 (2006) L103-L106
Abstract:	In this Letter, we announce the discovery of a new dwarf satellite of the Milky Way, located in the constellation Canes Venatici. It was found as a stellar overdensity in the North Galactic Cap using Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The satellite’s color-magnitude diagram shows a well-defined red giant branch, as well as a horizontal branch. As judged from the tip of the red giant branch, it lies at a distance of ~220 kpc. Based on the SDSS data, we estimate an absolute magnitude of Mv ~ -7.9, a central surface brightness of mu_0,V ~ 28 mag arcsecond^-2, and a half-light radius of ~ 8.5’ (~ 550 pc at the measured distance). The outer regions of Canes Venatici appear extended and distorted. The discovery of such a faint galaxy in proximity to the Milky Way strongly suggests that more such objects remain to be found.
Source:	arXiv, astro-ph/0604354
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