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The SLUGGS Survey: A Catalog of Over 4000 Globular Cluster Radial Velocities in 27 Nearby Early-type Galaxies
The Astronomical Journal (2017)
  • Duncan A. Forbes, Swinburne University of Technology
  • Adebusola B. Alabi, Swinburne University of Technology
  • Jean P. Brodie, University of California Observatories
  • Aaron J. Romanowsky, San Jose State University
  • Jay Strader, Michigan State University
  • Caroline Foster, Australian Astronomical Observatory
  • Christopher Usher, Liverpool John Moores University
  • Lee R. Spitler, Australian Astronomical Observatory
  • Sabine Bellstedt, Swinburne University of Technology
  • Nicola Pastorello, Swinburne University of Technology
  • Alexa Villaume, University of California Observatories
  • Asher Wasserman, University of California Observatories
  • Vincenzo Pota, INAF—Osservatorio Astronomico di Capodimonte
(An erratum for this article has been published in 2017 AJ 154 80.)
Here, we present positions and radial velocities for over 4000 globular clusters (GCs) in 27 nearby early-type galaxies from the SLUGGS survey. The SLUGGS survey is designed to be representative of elliptical and lenticular galaxies in the stellar mass range 10 < log M_*/M ⊙ < 11.7. The data have been obtained over many years, mostly using the very stable multi-object spectrograph DEIMOS on the Keck II 10 m telescope. Radial velocities are measured using the calcium triplet lines, with a velocity accuracy of ±10–15 km s−1. We use phase space diagrams (i.e., velocity–position diagrams) to identify contaminants such as foreground stars and background galaxies, and to show that the contribution of GCs from neighboring galaxies is generally insignificant. Likely ultra-compact dwarfs are tabulated separately. We find that the mean velocity of the GC system is close to that of the host galaxy systemic velocity, indicating that the GC system is in overall dynamical equilibrium within the galaxy potential. We also find that the GC system velocity dispersion scales with host galaxy stellar mass, in a similar manner to the Faber–Jackson relation for the stellar velocity dispersion. Publication of these GC radial velocity catalogs should enable further studies in many areas, such as GC system substructure, kinematics, and host galaxy mass measurements.
  • catalogs,
  • galaxies: star clusters: general,
  • surveys
Publication Date
Publisher Statement
This article was originally published in The Astronomical Journal, volume 153, issue 3. © 2017. The American Astronomical Society. All rights reserved.

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Citation Information
Duncan A. Forbes, Adebusola B. Alabi, Jean P. Brodie, Aaron J. Romanowsky, et al.. "The SLUGGS Survey: A Catalog of Over 4000 Globular Cluster Radial Velocities in 27 Nearby Early-type Galaxies" The Astronomical Journal Vol. 153 Iss. 3 (2017) ISSN: 0004-6256
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