Leo V: a Companion of a Companion of the Milky Way Galaxy?
نویسندگان
چکیده
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 kms, offset by ∼ 40 kms from that of Leo IV. A simple interpretation of the kinematic data is that both objects may lie on the same stream, though the implied orbit is only modestly eccentric (e ∼ 0.2) Subject headings: galaxies: dwarf — galaxies: individual (Leo) — Local Group
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