Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way | Zendy

M. J. Irwin | Zendy; Vasily Belokurov | Zendy; N. W. Evans | Zendy; Emma RyanWeber | Zendy; J. T. A. de Jong | Zendy; S. E. Koposov | Zendy; D. B. Zucker | Zendy; S. T. Hodgkin | Zendy; G. Gilmore | Zendy; P. Prema | Zendy; Leslie Hebb | Zendy; A. Begum | Zendy; M. Fellhauer | Zendy; P. C. Hewett | Zendy; Robert C. Kennicutt | Zendy; M. I. Wilkinson | Zendy; D. M. Bramich | Zendy; S. Vidrih | Zendy; HansWalter Rix | Zendy; Timothy C. Beers | Zendy; John C. Barentine | Zendy; H. Brewington | Zendy; Michael Harvanek | Zendy; J. Krzesiński | Zendy; D. Long | Zendy; A. Nitta | Zendy; S. Snedden | Zendy

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Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way

Author(s) -

M. J. Irwin,

Vasily Belokurov,

N. W. Evans,

Emma RyanWeber,

J. T. A. de Jong,

S. E. Koposov,

D. B. Zucker,

S. T. Hodgkin,

G. Gilmore,

P. Prema,

Leslie Hebb,

A. Begum,

M. Fellhauer,

P. C. Hewett,

Robert C. Kennicutt,

M. I. Wilkinson,

D. M. Bramich,

S. Vidrih,

HansWalter Rix,

Timothy C. Beers,

John C. Barentine,

H. Brewington,

Michael Harvanek,

J. Krzesiński,

D. Long,

A. Nitta,

S. Snedden

Publication year - 2007

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 - 10.1086/512183

Subject(s) - physics , astrophysics , dwarf galaxy , milky way , astronomy , galaxy , local group , population , metallicity , irregular galaxy , luminosity , dwarf spheroidal galaxy , star count , stellar population , star formation , sky , stars , interacting galaxy , t tauri star , k type main sequence star , demography , sociology

In this Letter, we announce the discovery of a new dwarf galaxy, Leo T, inthe Local Group. It was found as a stellar overdensity in the Sloan Digital SkySurvey Data Release 5 (SDSS DR5). The color-magnitude diagram of Leo T showstwo well-defined features, which we interpret as a red giant branch and asequence of young, massive stars. As judged from fits to the color-magnitudediagram, it lies at a distance of about 420 kpc and has an intermediate-agestellar population with a metallicity of [Fe/H]= -1.6, together with a youngpopulation of blue stars of age of 200 Myr. There is a compact cloud of neutralhydrogen with mass roughly 10^5 solar masses and radial velocity 35 km/scoincident with the object visible in the HIPASS channel maps. Leo T is thesmallest, lowest luminosity galaxy found to date with recent star-formation. Itappears to be a transition object similar to, but much lower luminosity than,the Phoenix dwarf.Comment: Ap J (Letters) in press, the subject of an SDSS press release toda

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