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Serendipitous Discovery of a Thin Stellar Stream near the Galactic Bulge in the Pan-STARRS1 3Pi Survey

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arxiv 1405.6645 v2 pith:XRW6EZ4T submitted 2014-05-26 astro-ph.GA

Serendipitous Discovery of a Thin Stellar Stream near the Galactic Bulge in the Pan-STARRS1 3Pi Survey

Edouard J. Bernard , Annette M. N. Ferguson , Edward F. Schlafly , Mohamad Abbas , Eric F. Bell , Niall R. Deacon , Nicolas F. Martin , Hans-Walter Rix
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Branimir Sesar Colin T. Slater Jorge Pe\~narrubia Rosemary F. G. Wyse William S. Burgett Kenneth C. Chambers Peter W. Draper Klaus W. Hodapp Nicholas Kaiser Rolf-Peter Kudritzki Eugene A. Magnier Nigel Metcalfe Jeffrey S. Morgan Paul A. Price John L. Tonry Richard J. Wainscoat Christopher Waters
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keywords streamdiscoverygalacticstellarbulgeglobularnearnearby
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We report the discovery of a thin stellar stream found in Pan-STARRS1 photometry near the Galactic bulge in the constellation of Ophiuchus. It appears as a coherent structure in the colour-selected stellar density maps produced to search for tidal debris around nearby globular clusters. The stream is exceptionally short and narrow; it is about 2.5{\deg} long and 6' wide in projection. The colour-magnitude diagram of this object, which harbours a blue horizontal-branch, is consistent with an old and relatively metal-poor population ([Fe/H]~-1.3) located 9.5 +/- 0.9 kpc away at (l,b) ~ (5{\deg},+32{\deg}), and 5.0 +/- 1.0 kpc from the Galactic centre. These properties argue for a globular cluster as progenitor. The finding of such a prominent, nearby stream suggests that many streams could await discovery in the more densely populated regions of our Galaxy.

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