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Discovery of a cold stellar stream in the ATLAS DR1 data

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

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


Authors

S.E. Koposov

M. Irwin

V. Belokurov

E. Gonzales-Solares

A. Kupcu Yoldas

J. Lewis



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° 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.

Citation

Koposov, S., Irwin, M., Belokurov, V., Gonzales-Solares, E., Kupcu Yoldas, A., Lewis, J., …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. https://doi.org/10.1093/mnrasl/slu060

Journal Article Type Article
Acceptance Date Apr 24, 2014
Publication Date Jul 21, 2014
Deposit Date Jun 2, 2014
Publicly Available Date May 21, 2015
Journal Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 442
Issue 1
Pages L85-L89
DOI https://doi.org/10.1093/mnrasl/slu060
Keywords Galaxy: fundamental parameters, Galaxy: halo, Galaxy: kinematics and dynamics.
Public URL https://durham-repository.worktribe.com/output/1427373
Related Public URLs http://ukads.nottingham.ac.uk/abs/2014arXiv1403.3409K

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Copyright 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.






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