Cats and dogs, hair and a hero: A quintet of new milky way companions

V. Belokurov; D. B. Zucker; N. W. Evans; J. T. Kleyna; S. Koposov; S. T. Hodgkin; M. J. Irwin; G. Gilmore; M. I. Wilkinson; M. Fellhauer; D. M. Bramich; P. C. Hewett; S. Vidrih; J. T A De Jong; J. A. Smith; H. W. Rix; E. F. Bell; R. F G Wyse; H. J. Newberg; P. A. Mayeur; B. Yanny; C. M. Rockosi; O. Y. Gnedin; D. P. Schneider; T. C. Beers; J. C. Barentine; H. Brewington; J. Brinkmann; M. Harvanek; S. J. Kleinman; J. Krzesinski; D. Long; A. Nitta; S. A. Snedden

doi:10.1086/509718

Cats and dogs, hair and a hero: A quintet of new milky way companions

V. Belokurov^*, D. B. Zucker, N. W. Evans, J. T. Kleyna, S. Koposov, S. T. Hodgkin, M. J. Irwin, G. Gilmore, M. I. Wilkinson, M. Fellhauer, D. M. Bramich, P. C. Hewett, S. Vidrih, J. T A De Jong, J. A. Smith, H. W. Rix, E. F. Bell, R. F G Wyse, H. J. Newberg, P. A. MayeurB. Yanny, C. M. Rockosi, O. Y. Gnedin, D. P. Schneider, T. C. Beers, J. C. Barentine, H. Brewington, J. Brinkmann, M. Harvanek, S. J. Kleinman, J. Krzesinski, D. Long, A. Nitta, S. A. Snedden

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

647 Citations (Scopus)

Abstract

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 colormagnitude 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 past two years, a total of 10 new Milky Way satellites with effective surface brightness μ_v ≳ 28 mag arcsec^-2 have been discovered in SDSS data. They are less luminous, more irregular, and apparently 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 and ∼100 pc. We conjecture that this may represent the division between star clusters and dwarf galaxies.

Original language	English
Pages (from-to)	897-906
Number of pages	10
Journal	Astrophysical Journal
Volume	654
Issue number	2 I
DOIs	https://doi.org/10.1086/509718
Publication status	Published - 10 Jan 2007
Externally published	Yes

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Belokurov, V., Zucker, D. B., Evans, N. W., Kleyna, J. T., Koposov, S., Hodgkin, S. T., Irwin, M. J., Gilmore, G., Wilkinson, M. I., Fellhauer, M., Bramich, D. M., Hewett, P. C., Vidrih, S., De Jong, J. T. A., Smith, J. A., Rix, H. W., Bell, E. F., Wyse, R. F. G., Newberg, H. J., ... Snedden, S. A. (2007). Cats and dogs, hair and a hero: A quintet of new milky way companions. Astrophysical Journal, 654(2 I), 897-906. https://doi.org/10.1086/509718

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title = "Cats and dogs, hair and a hero: A quintet of new milky way companions",

abstract = "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 colormagnitude 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 past two years, a total of 10 new Milky Way satellites with effective surface brightness μv ≳ 28 mag arcsec-2 have been discovered in SDSS data. They are less luminous, more irregular, and apparently 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 and ∼100 pc. We conjecture that this may represent the division between star clusters and dwarf galaxies.",

author = "V. Belokurov and Zucker, {D. B.} and Evans, {N. W.} and Kleyna, {J. T.} and S. Koposov and Hodgkin, {S. T.} and Irwin, {M. J.} and G. Gilmore and Wilkinson, {M. I.} and M. Fellhauer and Bramich, {D. M.} and Hewett, {P. C.} and S. Vidrih and {De Jong}, {J. T A} and Smith, {J. A.} and Rix, {H. W.} and Bell, {E. F.} and Wyse, {R. F G} and Newberg, {H. J.} and Mayeur, {P. A.} and B. Yanny and Rockosi, {C. M.} and Gnedin, {O. Y.} and Schneider, {D. P.} and Beers, {T. C.} and Barentine, {J. C.} and H. Brewington and J. Brinkmann and M. Harvanek and Kleinman, {S. J.} and J. Krzesinski and D. Long and A. Nitta and Snedden, {S. A.}",

year = "2007",

month = jan,

day = "10",

doi = "10.1086/509718",

language = "English",

volume = "654",

pages = "897--906",

journal = "Astrophysical Journal",

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Belokurov, V, Zucker, DB, Evans, NW, Kleyna, JT, Koposov, S, Hodgkin, ST, Irwin, MJ, Gilmore, G, Wilkinson, MI, Fellhauer, M, Bramich, DM, Hewett, PC, Vidrih, S, De Jong, JTA, Smith, JA, Rix, HW, Bell, EF, Wyse, RFG, Newberg, HJ, Mayeur, PA, Yanny, B, Rockosi, CM, Gnedin, OY, Schneider, DP, Beers, TC, Barentine, JC, Brewington, H, Brinkmann, J, Harvanek, M, Kleinman, SJ, Krzesinski, J, Long, D, Nitta, A & Snedden, SA 2007, 'Cats and dogs, hair and a hero: A quintet of new milky way companions', Astrophysical Journal, vol. 654, no. 2 I, pp. 897-906. https://doi.org/10.1086/509718

TY - JOUR

T1 - Cats and dogs, hair and a hero

T2 - A quintet of new milky way companions

AU - Belokurov, V.

AU - Zucker, D. B.

AU - Evans, N. W.

AU - Kleyna, J. T.

AU - Koposov, S.

AU - Hodgkin, S. T.

AU - Irwin, M. J.

AU - Gilmore, G.

AU - Wilkinson, M. I.

AU - Fellhauer, M.

AU - Bramich, D. M.

AU - Hewett, P. C.

AU - Vidrih, S.

AU - De Jong, J. T A

AU - Smith, J. A.

AU - Rix, H. W.

AU - Bell, E. F.

AU - Wyse, R. F G

AU - Newberg, H. J.

AU - Mayeur, P. A.

AU - Yanny, B.

AU - Rockosi, C. M.

AU - Gnedin, O. Y.

AU - Schneider, D. P.

AU - Beers, T. C.

AU - Barentine, J. C.

AU - Brewington, H.

AU - Brinkmann, J.

AU - Harvanek, M.

AU - Kleinman, S. J.

AU - Krzesinski, J.

AU - Long, D.

AU - Nitta, A.

AU - Snedden, S. A.

PY - 2007/1/10

Y1 - 2007/1/10

N2 - 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 colormagnitude 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 past two years, a total of 10 new Milky Way satellites with effective surface brightness μv ≳ 28 mag arcsec-2 have been discovered in SDSS data. They are less luminous, more irregular, and apparently 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 and ∼100 pc. We conjecture that this may represent the division between star clusters and dwarf galaxies.

AB - 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 colormagnitude 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 past two years, a total of 10 new Milky Way satellites with effective surface brightness μv ≳ 28 mag arcsec-2 have been discovered in SDSS data. They are less luminous, more irregular, and apparently 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 and ∼100 pc. We conjecture that this may represent the division between star clusters and dwarf galaxies.

UR - http://www.scopus.com/inward/record.url?scp=33846556211&partnerID=8YFLogxK

U2 - 10.1086/509718

DO - 10.1086/509718

M3 - Article

AN - SCOPUS:33846556211

SN - 0004-637X

VL - 654

SP - 897

EP - 906

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 I

ER -

Cats and dogs, hair and a hero: A quintet of new milky way companions

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