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

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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, ... continued below

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10 pages

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Belokurov, V.; Zucker, Daniel B.; Evans, N. W.; Kleyna, J. T.; Koposov, S.; Hodgkin, S. T. et al. August 1, 2006.

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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}{sub v} {approx}> 28 mag arcsec{sup -2} 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 {approx} 40 pc and {approx} 100 pc. We conjecture that this may represent the division between star clusters and dwarf galaxies.

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10 pages

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  • Journal Name: Astrophys.J.654:897-906,2007

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  • Report No.: FERMILAB-PUB-06-383-CD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 897899
  • Archival Resource Key: ark:/67531/metadc886293

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  • August 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Aug. 1, 2017, 12:14 p.m.

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Belokurov, V.; Zucker, Daniel B.; Evans, N. W.; Kleyna, J. T.; Koposov, S.; Hodgkin, S. T. et al. Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions, article, August 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc886293/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.