Details

Autor(en) / Beteiligte

• Zucker, D B
• Belokurov, V
• Evans, N W
• Wilkinson, MI
• Irwin, MJ
• Sivarani, T
• Hodgkin, S
• Bramich, D M
• Irwin, J M
• Gilmore, G
• Willman, B
• Vidrih, S
• Fellhauer, M
• Hewett, P C

Titel

A New Milky Way Dwarf Satellite in Canes Venatici

Ist Teil von

• The Astrophysical journal, 2006-06, Vol.643 (2), p.L103-L106

Erscheinungsjahr

2006

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 6220 kpc. Based on the SDSS data, we estimate an absolute magnitude of M sub(v) 6 - 7.9, a central surface brightness of k sub(0,V) 6 28 mag arcsec super(-2), and a half-light radius of 6'.5 (6550 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.