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

S. E. Koposov, M. Irwin, V. Belokurov, E. Gonzales-Solares, A. Kupcu Yoldas, J. Lewis, N. Metcalfe, T. Shanks

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## Abstract

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 degrees long, while its width is $\approx$ 0.25 deg. The Color Magnitude Diagram of this halo sub-structure is consistent with a metal-poor [Fe/H] $\lesssim -1.4$ stellar population located at a heliocentric distance of 20 $\pm$ 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.
Original language English Monthly Notices of the Royal Astronomical Society: Letters 5 Jun 2014 https://doi.org/10.1093/mnrasl/slu060 Published - 21 Jul 2014

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