The SLUGGS Survey

A catalog of over 4000 globular cluster radial velocities in 27 nearby early-type galaxies

Duncan A. Forbes, Adebusola Alabi, Jean P. Brodie, Aaron J. Romanowsky, Jay Strader, Caroline Foster, Christopher Usher, Lee Spitler, Sabine Bellstedt, Nicola Pastorello, Alexa Villaume, Asher Wasserman, Vincenzo Pota

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Abstract

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/Mo < 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.

Original languageEnglish
Article number114
Pages (from-to)1-10
Number of pages10
JournalAstronomical Journal
Volume153
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017

Bibliographical note

Copyright 2017 The American Astronomical Society. First published in the Astronomical journal, 153(3), 114, 2017, published by IOP Publishing. The original publication is available at http://www.doi.org/10.3847/1538-3881/153/3/114. 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.

Keywords

  • catalogs
  • galaxies: star clusters: general
  • surveys

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    Forbes, D. A., Alabi, A., Brodie, J. P., Romanowsky, A. J., Strader, J., Foster, C., ... Pota, V. (2017). The SLUGGS Survey: A catalog of over 4000 globular cluster radial velocities in 27 nearby early-type galaxies. Astronomical Journal, 153(3), 1-10. [114]. https://doi.org/10.3847/1538-3881/153/3/114