TY - JOUR
T1 - The SAGES Legacy Unifying Globulars and Galaxies Survey (SLUGGS)
T2 - sample definition, methods, and initial results
AU - Brodie, Jean P.
AU - Romanowsky, Aaron J.
AU - Strader, Jay
AU - Forbes, Duncan A.
AU - Foster, Caroline
AU - Jennings, Zachary G.
AU - Pastorello, Nicola
AU - Pota, Vincenzo
AU - Usher, Christopher
AU - Blom, Christina
AU - Kader, Justin
AU - Roediger, Joel C.
AU - Spitler, Lee R.
AU - Villaume, Alexa
AU - Arnold, Jacob A.
AU - Kartha, Sreeja S.
AU - Woodley, Kristin A.
N1 - Copyright 2014 The American Astronomical Society. First published in The Astrophysical Journal, 796(1), 52, 2014. The original publication is available at http://www.doi.org/10.1088/0004-637X/796/1/52, published by IOP Publishing. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2014/11/20
Y1 - 2014/11/20
N2 - We introduce and provide the scientific motivation for a wide-field photometric and spectroscopic chemodynamical survey of nearby early-type galaxies (ETGs) and their globular cluster (GC) systems. The SAGES Legacy Unifying Globulars and GalaxieS (SLUGGS) survey is being carried out primarily with Subaru/Suprime-Cam and Keck/DEIMOS. The former provides deep gri imaging over a 900 arcmin2 field-of-view to characterize GC and host galaxy colors and spatial distributions, and to identify spectroscopic targets. The NIR Ca II triplet provides GC line-of-sight velocities and metallicities out to typically ∼8 Re, and to ∼15 Re in some cases. New techniques to extract integrated stellar kinematics and metallicities to large radii (∼2-3 Re) are used in concert with GC data to create two-dimensional (2D) velocity and metallicity maps for comparison with simulations of galaxy formation. The advantages of SLUGGS compared with other, complementary, 2D-chemodynamical surveys are its superior velocity resolution, radial extent, and multiple halo tracers. We describe the sample of 25 nearby ETGs, the selection criteria for galaxies and GCs, the observing strategies, the data reduction techniques, and modeling methods. The survey observations are nearly complete and more than 30 papers have so far been published using SLUGGS data. Here we summarize some initial results, including signatures of two-phase galaxy assembly, evidence for GC metallicity bimodality, and a novel framework for the formation of extended star clusters and ultracompact dwarfs. An integrated overview of current chemodynamical constraints on GC systems points to separate, in situ formation modes at high redshifts for metal-poor and metal-rich GCs.
AB - We introduce and provide the scientific motivation for a wide-field photometric and spectroscopic chemodynamical survey of nearby early-type galaxies (ETGs) and their globular cluster (GC) systems. The SAGES Legacy Unifying Globulars and GalaxieS (SLUGGS) survey is being carried out primarily with Subaru/Suprime-Cam and Keck/DEIMOS. The former provides deep gri imaging over a 900 arcmin2 field-of-view to characterize GC and host galaxy colors and spatial distributions, and to identify spectroscopic targets. The NIR Ca II triplet provides GC line-of-sight velocities and metallicities out to typically ∼8 Re, and to ∼15 Re in some cases. New techniques to extract integrated stellar kinematics and metallicities to large radii (∼2-3 Re) are used in concert with GC data to create two-dimensional (2D) velocity and metallicity maps for comparison with simulations of galaxy formation. The advantages of SLUGGS compared with other, complementary, 2D-chemodynamical surveys are its superior velocity resolution, radial extent, and multiple halo tracers. We describe the sample of 25 nearby ETGs, the selection criteria for galaxies and GCs, the observing strategies, the data reduction techniques, and modeling methods. The survey observations are nearly complete and more than 30 papers have so far been published using SLUGGS data. Here we summarize some initial results, including signatures of two-phase galaxy assembly, evidence for GC metallicity bimodality, and a novel framework for the formation of extended star clusters and ultracompact dwarfs. An integrated overview of current chemodynamical constraints on GC systems points to separate, in situ formation modes at high redshifts for metal-poor and metal-rich GCs.
UR - http://www.scopus.com/inward/record.url?scp=84909646698&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/796/1/52
DO - 10.1088/0004-637X/796/1/52
M3 - Article
AN - SCOPUS:84909646698
SN - 0004-637X
VL - 796
SP - 1
EP - 25
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 52
ER -