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The Southern Stellar Stream Spectroscopic Survey (S⁵): Overview, Target Selection, Data Reduction, Validation, and Early Science

Li, T S, Koposov, S E, Zucker, D B, Lewis, G F, Kuehn, K, Simpson, J D, Ji, A P, Shipp, N, Mao, Y-Y, Geha, M , Pace, A B, Mackey, A D, Allam, S, Tucker, D L, Da Costa, G S, Erkal, Denis, Simon, J D, Mould, J R, Martell, S L, Wan, Z, De Silva, G M, Bechtol, K, Balbinot, E, Belokurov, V, Bland-Hawthorn, J, Casey, A R, Cullinane, L, Drlica-Wagner, A, Sharma, S, Vivas, A K, Wechsler, R H and Yanny, B (2019) The Southern Stellar Stream Spectroscopic Survey (S⁵): Overview, Target Selection, Data Reduction, Validation, and Early Science Monthly Notices of the Royal Astronomical Society.

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We introduce the Southern Stellar Stream Spectroscopy Survey (S⁵), an on-going program to map the kinematics and chemistry of stellar streams in the Southern Hemisphere. The initial focus of S⁵ has been spectroscopic observations of recently identified streams within the footprint of the Dark Energy Survey (DES), with the eventual goal of surveying streams across the entire southern sky. Stellar streams are composed of material that has been tidally striped from dwarf galaxies and globular clusters and hence are excellent dynamical probes of the gravitational potential of the Milky Way, as well as providing a detailed snapshot of its accretion history. Observing with the 3.9-m Anglo-Australian Telescope’s 2-degree-Field fibre positioner and AAOmega spectrograph, and combining the precise photometry of DES DR1 with the superb proper motions from Gaia DR2, allows us to conduct an efficient spectroscopic survey to map these stellar streams. So far S⁵ has mapped 9 DES streams and 3 streams outside of DES; the former are the first spectroscopic observations of these recently discovered streams. In addition to the stream survey, we use spare fibres to undertake a Milky Way halo survey and a low-redshift galaxy survey. This paper presents an overview of the S⁵ program, describing the scientific motivation for the survey, target selection, observation strategy, data reduction and survey validation. Finally, we describe early science results on stellar streams and Milky Way halo stars drawn from the survey. Updates on S⁵, including future public data releases, can be found at

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Li, T S
Koposov, S E
Zucker, D B
Lewis, G F
Kuehn, K
Simpson, J D
Ji, A P
Shipp, N
Mao, Y-Y
Geha, M
Pace, A B
Mackey, A D
Allam, S
Tucker, D L
Da Costa, G S
Simon, J D
Mould, J R
Martell, S L
Wan, Z
De Silva, G M
Bechtol, K
Balbinot, E
Belokurov, V
Bland-Hawthorn, J
Casey, A R
Cullinane, L
Drlica-Wagner, A
Sharma, S
Vivas, A K
Wechsler, R H
Yanny, B
Date : 3 October 2019
DOI : 10.1093/mnras/stz2731
Copyright Disclaimer : © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (
Uncontrolled Keywords : Galaxy: halo. Galaxy: kinematics and dynamics. Globular clusters: general. Galaxies: dwarf.
Depositing User : Clive Harris
Date Deposited : 31 Oct 2019 12:19
Last Modified : 31 Oct 2019 12:19

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