Astrophysics> Astrophysics of Galaxies
arXiv:1405.2079 (astro-ph)
[Submitted on 8 May 2014 (v1), last revised 10 Sep 2014 (this version, v2)]
Title:The SAGES Legacy Unifying Globulars and GalaxieS Survey (SLUGGS): Sample definition, methods, and initial results
Authors:Jean P. Brodie, Aaron J. Romanowsky, Jay Strader, Duncan A. Forbes, Caroline Foster, Zachary G. Jennings, Nicola Pastorello, Vincenzo Pota, Christopher Usher, Christina Blom, Justin Kader, Joel C. Roediger, Lee R. Spitler, Alexa Villaume, Jacob A. Arnold, Sreeja S. Kartha, Kristin A. Woodley
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Abstract: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 SLUGGS (SAGES Legacy Unifying Globulars and GalaxieS) survey is being carried out primarily with Subaru/Suprime-Cam and Keck/DEIMOS. The former provides deep gri imaging over a 900 arcmin^2 field-of-view to characterize GC and host galaxy colors and spatial distributions, and to identify spectroscopic targets. The NIR CaII triplet provides GC line-of-sight velocities and metallicities out to typically ~8 R_e, and to ~15 R_e in some cases. New techniques to extract integrated stellar kinematics and metallicities to large radii (~2-3 R_e) are used in concert with GC data to create two-dimensional 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.
| Comments: | ApJ, in press (minor changes), 27 pages, 19 figures, see high-resolution version at this http URL and survey website at this http URL |
| Subjects: | Astrophysics of Galaxies (astro-ph.GA) |
| Cite as: | arXiv:1405.2079 [astro-ph.GA] |
| (or arXiv:1405.2079v2 [astro-ph.GA] for this version) | |
| https://doi.org/10.48550/arXiv.1405.2079
arXiv-issued DOI via DataCite
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| Related DOI: | https://doi.org/10.1088/0004-637X/796/1/52
DOI(s) linking to related resources
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Submission history
From: Aaron J. Romanowsky [view email][v1] Thu, 8 May 2014 20:00:08 UTC (11,323 KB)
[v2] 2014年9月10日 06:00:01 UTC (10,848 KB)
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