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Discovery of a cold stellar stream in the ATLAS DR1 data.

Koposov, S.E. and Irwin, M. and Belokurov, V. and Gonzales-Solares, E. and Kupcu Yoldas, A. and Lewis, J. and Metcalfe, N. and Shanks, T. (2014) 'Discovery of a cold stellar stream in the ATLAS DR1 data.', Monthly notices of the Royal Astronomical Society : letters., 442 (1). L85-L89.


We report the discovery of a narrow stellar stream crossing the constellations of Sculptor and Fornax in the Southern celestial hemisphere. The portion of the stream detected in the Data Release 1 photometry of the ATLAS survey is at least 12° long, while its width is ≈0 ∘.25. The colour–magnitude diagram of this halo sub-structure is consistent with a metal-poor [Fe/H] ≲ −1.4 stellar population located at a heliocentric distance of 20 ± 2 kpc. There are three globular clusters that could tentatively be associated with the stream: NGC 7006, NGC 7078 (M15) and Pyxis, but NGC 7006 and 7078 seem to have proper motions incompatible with the stream orbit.

Item Type:Article
Keywords:Galaxy: fundamental parameters, Galaxy: halo, Galaxy: kinematics and dynamics.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:24 April 2014
Date deposited:21 May 2015
Date of first online publication:July 2014
Date first made open access:No date available

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