Big fish, small fish: Two New Ultra-Faint Satellites of the Milky Way

(2) Steward Observatory; (3) University of Michigan); Cambridge; D. Just (2); E. Olszewski (2); G. Gilmore (1); L. Watkins (1); L. Wyrzykowski (1) ((1) IoA; M.G. Walker (1); M. J. Irwin (1)

arxiv: 1002.0504 · v1 · pith:3ADD5UYRnew · submitted 2010-02-02 · 🌌 astro-ph.GA · astro-ph.SR

Big fish, small fish: Two New Ultra-Faint Satellites of the Milky Way

V. Belokurov (1) , M.G. Walker (1) , N.W. Evans (1) , G. Gilmore (1) , M. J. Irwin (1) , D. Just (2) , S. Koposov (1) , M. Mateo (3)

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E. Olszewski (2) L. Watkins (1) L. Wyrzykowski (1) ((1) IoA Cambridge (2) Steward Observatory Tucson (3) University of Michigan)

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classification 🌌 astro-ph.GA astro-ph.SR

keywords piscesultra-faintdistancefishliesmilkysatellitessegue

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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 degrees 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 twenty times smaller at only 3pc.

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Photometric analysis yields metallicity distributions for 3917 stars across 12 faint Milky Way satellites, showing average [Fe/H] ~ -2.3 dex, 170 EMP candidates, and no gradients in ultra-faint systems.