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

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dc.creatorBelokurov, V.
dc.creatorZucker, D. B.
dc.creatorEvans, N. W.
dc.creatorKleyna, J. T.
dc.creatorKoposov, S.
dc.creatorHodgkin, S. T.
dc.creatorIrwin, M. J.
dc.creatorGilmore, G.
dc.creatorWilkinson, M. I.
dc.creatorFellhauer, M.
dc.creatorBramich, D. M.
dc.creatorHewett, P. C.
dc.creatorVidrih, S.
dc.creatorDe Jong, J. T. A.
dc.creatorSmith, J. A.
dc.creatorRix, H. -W.
dc.creatorBell, E. F.
dc.creatorWyse, R. F. G.
dc.creatorNewberg, H. J.
dc.creatorMayeur, P. A.
dc.creatorYanny, B.
dc.creatorRockosi, C. M.
dc.creatorGnedin, O. Y.
dc.creatorSchneider, D. P.
dc.creatorBeers, T. C.
dc.creatorBarentine, J. C.
dc.creatorBrewington, H.
dc.creatorBrinkmann, J.
dc.creatorHarvanek, M.
dc.creatorKleinman, S. J.
dc.creatorKrzesinski, J.
dc.creatorLong, D.
dc.creatorNitta, A.
dc.creatorSnedden, S. A.
dc.date2006-08-21
dc.date.accessioned2026-07-07T11:25:55Z
dc.date.available2026-07-07T11:25:55Z
dc.descriptionWe 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.
dc.description10 pages, 8 figures, submitted to the Astrophysical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0608448
dc.identifierhttp://arxiv.org/abs/astro-ph/0608448
dc.identifierAstrophys.J.654:897-906,2007
dc.identifierdoi:10.1086/509718
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195663
dc.subjectAstrophysics
dc.titleCats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
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