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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A curious Milky Way satellite in Ursa Major
Astrophysical Journal, Volume 650, No. 1 II, Year 2006
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Description
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 subgiant branch, main sequence, and turnoff, from which we estimate a distance of ∼30 kpc and a projected size of ∼250 × 125 pc2. 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 Mv ∼ -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. © 2006. The American Astronomical Society, All rights reserved.
Authors & Co-Authors
Zucker, Daniel B.
United Kingdom, Cambridge
Institute of Astronomy
Belokurov, Vasily A.
United Kingdom, Cambridge
Institute of Astronomy
Evans, N. Wyn
United Kingdom, Cambridge
Institute of Astronomy
Kleyna, Jan T.
United States, Honolulu
University Hawaii Institute for Astronomy
Irwin, Michael J.
United Kingdom, Cambridge
Institute of Astronomy
Wilkinson, Mark I.
United Kingdom, Cambridge
Institute of Astronomy
Fellhauer, M.
United Kingdom, Cambridge
Institute of Astronomy
Bramich, Daniel M.
United Kingdom, Cambridge
Institute of Astronomy
Gilmore, Gerard F.
United Kingdom, Cambridge
Institute of Astronomy
Newberg, Heidi J.
United States, Troy
Rensselaer Polytechnic Institute
Yanny, Brian
United States, Batavia
Fermi National Accelerator Laboratory
Smith, J. Allyn
United States, Los Alamos
Los Alamos National Laboratory
United States, Clarksville
Austin Peay State University
Hewett, Paul C.
United Kingdom, Cambridge
Institute of Astronomy
Bell, Eric F.
United States, Honolulu
University Hawaii Institute for Astronomy
Rix, Hans Walter R.
Germany, Heidelberg
Max Planck Institute for Astronomy
Gnedin, Oleg Y.
United States, Columbus
The Ohio State University
Vidrih, Simon
United Kingdom, Cambridge
Institute of Astronomy
Wyse, Rosemary F.G.
United States, Baltimore
Johns Hopkins University
Willman, B.
United States, New York
The Center for Cosmology and Particle Physics
Grebel, Eva K.
Switzerland, Basel
Universitat Basel
P. Schneider, Donald P.
United States, University Park
Pennsylvania State University
Beers, Timothy C.
United States, East Lansing
Michigan State University
Kniazev, Alexei Yu
Germany, Heidelberg
Max Planck Institute for Astronomy
South Africa, Cape Town
South African Astronomical Observatory
Barentine, John C.
United States, Sunspot
Apache Point Observatory
Brewington, Howard J.
United States, Sunspot
Apache Point Observatory
Brinkmann, Jon
United States, Sunspot
Apache Point Observatory
Harvanek, Michael
United States, Sunspot
Apache Point Observatory
Kleinman, Scott J.
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Krzesiński, Jurek
United States, Sunspot
Apache Point Observatory
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Long, Daniel C.
United States, Sunspot
Apache Point Observatory
Nitta, Atsuko
United States, Hilo
Gemini Observatory
Snedden, Stephanie A.
United States, Sunspot
Apache Point Observatory
Statistics
Citations: 261
Authors: 32
Affiliations: 18
Identifiers
Doi:
10.1086/508628
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative