An orphan in the "field of streams"

V. Belokurov, N. W. Evans, M. J. Irwin, D. Lynden-Bell, B. Yanny, S. Vidrih, G. Gilmore, G. Seabroke, D. B. Zucker, M. I. Wilkinson, P. C. Hewett, D. M. Bramich, M. Fellhauer, H. J. Newberg, R. F G Wyse, T. C. Beers, E. F. Bell, J. C. Barentine, J. Brinkmann, N. Cole & 2 others K. Pan, D. G. York

Research output: Contribution to journalArticle

181 Citations (Scopus)

Abstract

We use Sloan Digital Sky Survey Data Release 5 photometry and spectroscopy to study a tidal stream that extends over ∼50° in the north Galactic cap. From the analysis of the path of the stream and the colors and magnitudes of its stars, the stream is ∼20-5 +7 kpc away at its nearest detection (the celestial equator). We detect a distance gradient: the stream is farther away from us at higher declination. The contents of the stream are made up from a predominantly old and metal-poor population that is similar to the globular clusters M13 and M92. The integrated absolute magnitude of the stream stars is estimated to be Mr ∼ -7.5. There is tentative evidence for a velocity signature, with the stream moving at ∼-40 km s -1 at low declinations and ∼+100 km s-1 at high declinations. The stream lies on the same great circle as Complex A, a roughly linear association of H I high-velocity clouds stretching over ∼30° on the sky, and as Ursa Major II, a recently discovered dwarf spheroidal galaxy. Lying close to the same great circle are a number of anomalous, young, and metal-poor globular clusters, including Palomar 1 and Ruprecht 106.

Original languageEnglish
Pages (from-to)337-344
Number of pages8
JournalAstrophysical Journal
Volume658
Issue number1 I
DOIs
Publication statusPublished - 20 Mar 2007
Externally publishedYes

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orphan
declination
great circles
globular clusters
stars
metal
dwarf galaxies
equators
caps
metals
photometry
sky
spectroscopy
signatures
color
gradients

Keywords

  • Galaxies: kinematics and dynamics
  • Galaxies: structure
  • Local group

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Belokurov, V., Evans, N. W., Irwin, M. J., Lynden-Bell, D., Yanny, B., Vidrih, S., ... York, D. G. (2007). An orphan in the "field of streams". Astrophysical Journal, 658(1 I), 337-344. https://doi.org/10.1086/511302

An orphan in the "field of streams". / Belokurov, V.; Evans, N. W.; Irwin, M. J.; Lynden-Bell, D.; Yanny, B.; Vidrih, S.; Gilmore, G.; Seabroke, G.; Zucker, D. B.; Wilkinson, M. I.; Hewett, P. C.; Bramich, D. M.; Fellhauer, M.; Newberg, H. J.; Wyse, R. F G; Beers, T. C.; Bell, E. F.; Barentine, J. C.; Brinkmann, J.; Cole, N.; Pan, K.; York, D. G.

In: Astrophysical Journal, Vol. 658, No. 1 I, 20.03.2007, p. 337-344.

Research output: Contribution to journalArticle

Belokurov, V, Evans, NW, Irwin, MJ, Lynden-Bell, D, Yanny, B, Vidrih, S, Gilmore, G, Seabroke, G, Zucker, DB, Wilkinson, MI, Hewett, PC, Bramich, DM, Fellhauer, M, Newberg, HJ, Wyse, RFG, Beers, TC, Bell, EF, Barentine, JC, Brinkmann, J, Cole, N, Pan, K & York, DG 2007, 'An orphan in the "field of streams"', Astrophysical Journal, vol. 658, no. 1 I, pp. 337-344. https://doi.org/10.1086/511302
Belokurov V, Evans NW, Irwin MJ, Lynden-Bell D, Yanny B, Vidrih S et al. An orphan in the "field of streams". Astrophysical Journal. 2007 Mar 20;658(1 I):337-344. https://doi.org/10.1086/511302
Belokurov, V. ; Evans, N. W. ; Irwin, M. J. ; Lynden-Bell, D. ; Yanny, B. ; Vidrih, S. ; Gilmore, G. ; Seabroke, G. ; Zucker, D. B. ; Wilkinson, M. I. ; Hewett, P. C. ; Bramich, D. M. ; Fellhauer, M. ; Newberg, H. J. ; Wyse, R. F G ; Beers, T. C. ; Bell, E. F. ; Barentine, J. C. ; Brinkmann, J. ; Cole, N. ; Pan, K. ; York, D. G. / An orphan in the "field of streams". In: Astrophysical Journal. 2007 ; Vol. 658, No. 1 I. pp. 337-344.
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