A New Milky Way Dwarf Satellite in Canes Venatici

Details A New Milky Way Dwarf Satellite in Canes Venatici A New Milky Way Dwarf Satellite in Canes Venatici

2006-04-17

arxiv.org/abs/astro-ph/0604354v1

Astrophys.J.643:L103-L106,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures; submitted to ApJ Letters

Scientific paper

10.1086/505216

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.

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