Big fish, little fish: Two new ultra-faint satellites of the milky way

V. Belokurov; M. G. Walker; N. W. Evans; G. Gilmore; M. J. Irwin; D. Just; S. Koposov; M. Mateo; E. Olszewski; L. Watkins; L. Wyrzykowski

doi:10.1088/2041-8205/712/1/L103

Big fish, little fish: Two new ultra-faint satellites of the milky way

V. Belokurov, M. G. Walker, N. W. Evans, G. Gilmore, M. J. Irwin, D. Just, S. Koposov, M. Mateo, E. Olszewski, L. Watkins, L. Wyrzykowski

Astronomy

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158 Scopus citations

Abstract

We report the discovery of two new Milky Way satellites in the neighboring constellations of Pisces and Pegasus identified in data from the Sloan Digital Sky Survey. Pisces II, an ultra-faint dwarf galaxy lies at the distance of 180 kpc, some 15°away from the recently detected Pisces I. Segue 3, an ultra-faint star cluster lies at the distance of 16 kpc. We use deep follow-up imaging obtained with the 4-m Mayall Telescope at Kitt Peak National Observatory to derive their structural parameters. Pisces II has a half-light radius of 60 pc, while Segue 3 is 20 times smaller at only 3 pc.

Original language	English (US)
Pages (from-to)	L103-L106
Journal	Astrophysical Journal Letters
Volume	712
Issue number	1 PART 2
DOIs	https://doi.org/10.1088/2041-8205/712/1/L103
State	Published - 2010

Keywords

Galaxies: dwarf
Galaxies: individual (Pisces, Pegasus)
Local Group

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/2041-8205/712/1/L103

Cite this

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title = "Big fish, little fish: Two new ultra-faint satellites of the milky way",

abstract = "We report the discovery of two new Milky Way satellites in the neighboring constellations of Pisces and Pegasus identified in data from the Sloan Digital Sky Survey. Pisces II, an ultra-faint dwarf galaxy lies at the distance of 180 kpc, some 15°away from the recently detected Pisces I. Segue 3, an ultra-faint star cluster lies at the distance of 16 kpc. We use deep follow-up imaging obtained with the 4-m Mayall Telescope at Kitt Peak National Observatory to derive their structural parameters. Pisces II has a half-light radius of 60 pc, while Segue 3 is 20 times smaller at only 3 pc.",

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author = "V. Belokurov and Walker, {M. G.} and Evans, {N. W.} and G. Gilmore and Irwin, {M. J.} and D. Just and S. Koposov and M. Mateo and E. Olszewski and L. Watkins and L. Wyrzykowski",

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T2 - Two new ultra-faint satellites of the milky way

AU - Belokurov, V.

AU - Walker, M. G.

AU - Evans, N. W.

AU - Gilmore, G.

AU - Irwin, M. J.

AU - Just, D.

AU - Koposov, S.

AU - Mateo, M.

AU - Olszewski, E.

AU - Watkins, L.

AU - Wyrzykowski, L.

PY - 2010

Y1 - 2010

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AB - We report the discovery of two new Milky Way satellites in the neighboring constellations of Pisces and Pegasus identified in data from the Sloan Digital Sky Survey. Pisces II, an ultra-faint dwarf galaxy lies at the distance of 180 kpc, some 15°away from the recently detected Pisces I. Segue 3, an ultra-faint star cluster lies at the distance of 16 kpc. We use deep follow-up imaging obtained with the 4-m Mayall Telescope at Kitt Peak National Observatory to derive their structural parameters. Pisces II has a half-light radius of 60 pc, while Segue 3 is 20 times smaller at only 3 pc.

KW - Galaxies: dwarf

KW - Galaxies: individual (Pisces, Pegasus)

KW - Local Group

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Big fish, little fish: Two new ultra-faint satellites of the milky way

Abstract

Keywords

ASJC Scopus subject areas

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