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; K. Pan; D. G. York

doi:10.1086/511302

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. ColeK. Pan, D. G. York

^*Corresponding author for this work

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

244 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 M_r ∼ -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 language	English
Pages (from-to)	337-344
Number of pages	8
Journal	Astrophysical Journal
Volume	658
Issue number	1 I
DOIs	https://doi.org/10.1086/511302
Publication status	Published - 20 Mar 2007
Externally published	Yes

Keywords

Galaxies: kinematics and dynamics
Galaxies: structure
Local group

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10.1086/511302

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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., ... York, D. G. (2007). An orphan in the "field of streams". Astrophysical Journal, 658(1 I), 337-344. https://doi.org/10.1086/511302

@article{d69f01098bd74e7fa817f541c25ec492,

title = "An orphan in the {"}field of streams{"}",

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.",

keywords = "Galaxies: kinematics and dynamics, Galaxies: structure, Local group",

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

year = "2007",

month = mar,

day = "20",

doi = "10.1086/511302",

language = "English",

volume = "658",

pages = "337--344",

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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

TY - JOUR

T1 - An orphan in the "field of streams"

AU - Belokurov, V.

AU - Evans, N. W.

AU - Irwin, M. J.

AU - Lynden-Bell, D.

AU - Yanny, B.

AU - Vidrih, S.

AU - Gilmore, G.

AU - Seabroke, G.

AU - Zucker, D. B.

AU - Wilkinson, M. I.

AU - Hewett, P. C.

AU - Bramich, D. M.

AU - Fellhauer, M.

AU - Newberg, H. J.

AU - Wyse, R. F G

AU - Beers, T. C.

AU - Bell, E. F.

AU - Barentine, J. C.

AU - Brinkmann, J.

AU - Cole, N.

AU - Pan, K.

AU - York, D. G.

PY - 2007/3/20

Y1 - 2007/3/20

N2 - 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.

AB - 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.

KW - Galaxies: kinematics and dynamics

KW - Galaxies: structure

KW - Local group

UR - http://www.scopus.com/inward/record.url?scp=34047213491&partnerID=8YFLogxK

U2 - 10.1086/511302

DO - 10.1086/511302

M3 - Article

AN - SCOPUS:34047213491

SN - 0004-637X

VL - 658

SP - 337

EP - 344

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

An orphan in the "field of streams"

Abstract

Keywords

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