The SLUGGS survey: a catalog of over 4000 globular cluster radial velocities in 27 nearby early-type galaxies

Forbes, Duncan A, Alabi, Adebusola, Brodie, Jean P, Romanowsky, Aaron J, Strader, Jay, Foster, Caroline, Usher, Christopher, Spitler, Lee, Bellstedt, Sabine, Pastorello, Nicola, Villaume, Alexa, Wasserman, Asher and Pota, Vincenzo 2017, The SLUGGS survey: a catalog of over 4000 globular cluster radial velocities in 27 nearby early-type galaxies, Astronomical journal, vol. 153, no. 3, pp. 1-10, doi: 10.3847/1538-3881/153/3/114.

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Title The SLUGGS survey: a catalog of over 4000 globular cluster radial velocities in 27 nearby early-type galaxies
Author(s) Forbes, Duncan A
Alabi, Adebusola
Brodie, Jean P
Romanowsky, Aaron J
Strader, Jay
Foster, Caroline
Usher, Christopher
Spitler, Lee
Bellstedt, Sabine
Pastorello, NicolaORCID iD for Pastorello, Nicola
Villaume, Alexa
Wasserman, Asher
Pota, Vincenzo
Journal name Astronomical journal
Volume number 153
Issue number 3
Article ID 114
Start page 1
End page 10
Total pages 10
Publisher IOP Publishing
Place of publication Bristol, Eng.
Publication date 2017-03
ISSN 0004-6256
Keyword(s) catalogs
star clusters
science & technology
physical sciences
astronomy & astrophysics
Summary 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 o < 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.
Language eng
DOI 10.3847/1538-3881/153/3/114
Field of Research 0201 Astronomical And Space Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, The American Astronomical Society
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