Discovery of a cold stellar stream in the ATLAS DR1 data

作者：Koposov S E^*; Irwin M; Belokurov V; Gonzalez Solares E; Yoldas A Kupcu; Lewis J; Metcalfe N; Shanks T

来源：Monthly Notices of the Royal Astronomical Society, 2014, 442(1): L85-L89.

DOI：10.1093/mnrasl/slu060

• Galaxy: fundamental parameters
• Galaxy: halo
• Galaxy: kinematics and dynamics

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 approximate to 0 degrees.25. The colour-magnitude diagram of this halo sub-structure is consistent with a metal-poor [Fe/H] less than or similar to -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.

• 出版日期2014-7-21