A Curious Milky Way Satellite in Ursa Major | Zendy

D. B. Zucker | Zendy; Vasily Belokurov | Zendy; N. W. Evans | Zendy; Jan Kleyna | Zendy; M. J. Irwin | Zendy; M. I. Wilkinson | Zendy; M. Fellhauer | Zendy; D. M. Bramich | Zendy; G. Gilmore | Zendy; Heidi Jo Newberg | Zendy; B. Yanny | Zendy; J. A. Smith | Zendy; P. C. Hewett | Zendy; Eric F. Bell | Zendy; HansWalter Rix | Zendy; Oleg Y. Gnedin | Zendy; S. Vidrih | Zendy; Rosemary F. Ġ. Wyse | Zendy; Beth Willman | Zendy; E. K. Grebel | Zendy; Donald P. Schneider | Zendy; Timothy C. Beers | Zendy; A. Y. Kniazev | Zendy; John C. Barentine | Zendy; H. Brewington | Zendy; J. Brinkmann | Zendy; Michael Harvanek | Zendy; S. J. Kleinman | Zendy; J. Krzesiński | Zendy; Daniel C. Long | Zendy; A. Nitta | Zendy; S. Snedden | Zendy

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A Curious Milky Way Satellite in Ursa Major

Author(s) -

D. B. Zucker,

Vasily Belokurov,

N. W. Evans,

Jan Kleyna,

M. J. Irwin,

M. I. Wilkinson,

M. Fellhauer,

D. M. Bramich,

G. Gilmore,

Heidi Jo Newberg,

B. Yanny,

J. A. Smith,

P. C. Hewett,

Eric F. Bell,

HansWalter Rix,

Oleg Y. Gnedin,

S. Vidrih,

Rosemary F. Ġ. Wyse,

Beth Willman,

E. K. Grebel,

Donald P. Schneider,

Timothy C. Beers,

A. Y. Kniazev,

John C. Barentine,

H. Brewington,

J. Brinkmann,

Michael Harvanek,

S. J. Kleinman,

J. Krzesiński,

Daniel C. Long,

A. Nitta,

S. Snedden

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/508628

Subject(s) - physics , milky way , astrophysics , astronomy , sky , satellite galaxy , galaxy , subgiant , local group , population , magnitude (astronomy) , satellite , metallicity , stellar population , absolute magnitude , star formation , globular cluster , demography , sociology

In this Letter, we study a localized stellar overdensity in the constellationof Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data andsubsequently followed up with Subaru imaging. Its color-magnitude diagram (CMD)shows a well-defined sub-giant branch, main sequence and turn-off, from whichwe estimate a distance of ~30 kpc and a projected size of ~250 x 125 pc. TheCMD 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 previouslyunknown 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'sisophotes are irregular and distorted with evidence for multipleconcentrations; this suggests that the satellite is in the process ofdisruption.Comment: 4 pages, 4 figures, submitted to ApJ Letter

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