LEO V: A COMPANION OF A COMPANION OF THE MILKY WAY GALAXY?статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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 similar to 180 kpc, and is separated by less than or similar to 3 degrees 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 similar to 173.3 +/- 3.1 km s(-1), offset by similar to 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 similar to 0.2)