info/FAQ

Research articles

My Pages

Stat

Members: 3645
Articles: 2'506'875
Articles rated: 2609

29 April 2024

» arxiv » astro-ph/0606633

Article overview

A Curious New Milky Way Satellite in Ursa Major
D.B. Zucker ; V. Belokurov ; N.W. Evans ; J.T. Kleyna ; M.J. Irwin ; M.I. Wilkinson ; M. Fellhauer ; D.M. Bramich ; G. Gilmore ; H.J. Newberg ; B. Yanny ; J.A. Smith ; P.C. Hewett ; E.F. Bell ; H.-W. Rix ; O.Y. Gnedin ; S. Vidrih ; R.F.G. Wyse ; B. Willman ; E.K. Grebel ; D.P. Schneider ; T.C. Beers ; A.Y. Kniazev ; J.C. Barentine ; H. Brewington ; J. Brinkmann ; M. Harvanek ; S.J. Kleinman ; J. Krzesinski ; D. Long ; A. Nitta ; S.A. Snedden ;
Date:	4 Jul 2006
Abstract:	In this Letter, we study a localized stellar overdensity in the constellation of Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data and subsequently followed up with Subaru imaging. Its color-magnitude diagram (CMD) shows a well-defined sub-giant branch, main sequence and turn-off, from which we estimate a distance of ~30 kpc and a projected size of ~250 x 125 pc. The CMD suggests a composite population with some range in metallicity and/or age. Based on its extent and stellar population, we argue that this is a previously unknown satellite galaxy of the Milky Way, hereby named Ursa Major II (UMa II) after its constellation. Using SDSS data, we find an absolute magnitude of M_V ~ -3.8, which would make it the faintest known satellite galaxy. UMa II’s isophotes are irregular and distorted with evidence for multiple concentrations; this suggests that the satellite is in the process of disruption.
Source:	arXiv, astro-ph/0606633
Services:	Forum \| Review \| PDF \| Favorites

No review found.

Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

ScienXe.org
» my Online CV
» Free

News, job offers and information for researchers and scientists:

home

contact

sitemap