Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions

Details Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions

2006-08-21

arxiv.org/abs/astro-ph/0608448v1

Astrophys.J.654:897-906,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 8 figures, submitted to the Astrophysical Journal

Scientific paper

10.1086/509718

We present five new satellites of the Milky Way discovered in Sloan Digital Sky Survey (SDSS) imaging data, four of which were followed-up with either the Subaru or the Isaac Newton Telescopes. They include four probable new dwarf galaxies -- one each in the constellations of Coma Berenices, Canes Venatici, Leo and Hercules -- together with one unusually extended globular cluster, Segue 1. We provide distances, absolute magnitudes, half-light radii and color-magnitude diagrams for all five satellites. The morphological features of the color-magnitude diagrams are generally well described by the ridge line of the old, metal-poor globular cluster M92. In the last two years, a total of ten new Milky Way satellites with effective surface brightness mu_v >~ 28 mag/sq. arcsec have been discovered in SDSS data. They are less luminous, more irregular and appear to be more metal-poor than the previously-known nine Milky Way dwarf spheroidals. The relationship between these objects and other populations is discussed. We note that there is a paucity of objects with half-light radii between ~40 pc and ~ 100 pc. We conjecture that this may represent the division between star clusters and dwarf galaxies.

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