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Title:
Leo V: A Companion of a Companion of the Milky Way Galaxy?
Authors:
Belokurov, V.; Walker, M. G.; Evans, N. W.; Faria, D. C.; Gilmore, G.; Irwin, M. J.; Koposov, S.; Mateo, M.; Olszewski, E.; Zucker, D. B.
Affiliation:
AA(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; , , .), AB(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; , , .), AC(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; , , .), AD(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; , , .), AE(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; , , .), AF(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; , , .), AG(Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany.), AH(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109.), AI(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AJ(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; , , .)
Publication:
The Astrophysical Journal, Volume 686, Issue 2, pp. L83-L86. (ApJL Homepage)
Publication Date:
10/2008
Origin:
UCP
ApJ Keywords:
Galaxies: Dwarf, galaxies: individual (Leo), Galaxies: Local Group
DOI:
10.1086/592962
Bibliographic Code:
2008ApJ...686L..83B

Abstract

We report the discovery of a new Milky Way satellite in the constellation Leo, identified in data from the Sloan Digital Sky Survey. It lies at a distance of ~180 kpc, and is separated by <~3° from another recent discovery, Leo IV. We present follow-up imaging from the Isaac Newton Telescope and spectroscopy from the Hectochelle fiber spectrograph at the Multiple Mirror Telescope. Leo V's heliocentric velocity is ~173.3 +/- 3.1 km s-1, offset by ~40 km s-1 from that of Leo IV. A simple interpretation of the kinematic data is that both objects may lie on the same stream, although the implied orbit is only modestly eccentric (e~0.2)
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