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J/AJ/153/114     GCs in 27 nearby ETGs from the SLUGGS survey    (Forbes+, 2017)

The SLUGGS survey: a catalog of over 4000 globular cluster radial velocities in 27 nearby early-type galaxies. Forbes D.A., Alabi A., Brodie J.P., Romanowsky A.J., Strader J., Foster C., Usher C., Spitler L., Bellstedt S., Pastorello N., Villaume A., Wasserman A., Pota V. <Astron. J., 153, 114-114 (2017)> =2017AJ....153..114F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Morphology ; Velocity dispersion ; Radial velocities ; Surveys Keywords: catalogs - galaxies: star clusters: general - surveys 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<logM*/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. 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. Description: Our sample consists of GC systems associated with 25 early-type galaxies from the SLUGGS survey (Brodie et al. 2014ApJ...796...52B) plus two of the three bonus galaxies (NGC 3607 and NGC 5866) that were observed with the same setup. We have obtained wide-field multi-filter imaging of the SLUGGS galaxies using the Subaru telescope under =<1 arcsec seeing conditions. This is supplemented by HST and CFHT imaging. Spectroscopic observations of GC candidates were obtained over the last decade using the DEIMOS spectrograph (Faber et al. 2003SPIE.4841.1657F) on the Keck II 10 m telescope. The DEIMOS instrument is used in multi-slit mode, with each slit mask covering an area of ∼16x5 arcmin2. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 67 27 SLUGGS Galaxy Properties table2.dat 61 865 Contaminants table3.dat 24 21 Neighbor Galaxies table4.dat 61 33 Ultra-compact Dwarf Radial Velocities table5.dat 61 3573 Globular Cluster Radial Velocities (from Erratum, 2017, AJ, 154, 80)
See also: J/MNRAS/428/389 : SLUGGS globular clusters in early-type galaxies (Pota+, 2013) J/MNRAS/436/1172 : Globular Clusters of NGC 4278 in SLUGGS (Usher+, 2013) J/AJ/148/32 : Globular cluster candidates in NGC 3115 (Jennings+, 2014) J/MNRAS/452/2208 : NGC 4473 globular clusters (Alabi+, 2015) J/MNRAS/458/105 : SLUGGS NGC 3607 and 3608 globular clusters (Kartha+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- NGC [720/7457] SLUGGS galaxy name 6- 8 I3 --- N [32/654] Number of galaxy data in tables 2-5 10- 13 F4.1 Mpc Dist [9.4/26.9] Distance (1) 15- 19 F5.2 [Msun] logM* [10.13/11.62] Log stellar mass (2) 21- 25 F5.1 arcsec Reff [10.1/139] Effective radius (2) 27- 33 A7 --- MType Hubble morphological type (1) 35 A1 --- Env Local environment type (F=Field, G=Group) (1) 37- 40 I4 km/s Vsys [558/2260] Galaxy systemic velocity (1) 42- 44 I3 km/s sigma [74/308] Stellar velocity dispersion within 1 kpc (1) 46- 55 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) (3) 57- 67 F11.7 deg DEdeg Declination in decimal degrees (J2000) (3)
Note (1): Values taken from Brodie et al. (2014ApJ...796...52B). Note that Vsys for NGC 4474 was reported incorrectly in Brodie et al. and has been corrected here. Note (2): Values from Forbes et al. (2017MNRAS.464.4611F). Note (3): The position of each galaxy center is taken from the NASA Extragalactic Database.
Byte-by-byte Description of file: table2.dat table4.dat table5.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Star Object identifier 16- 25 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 27- 36 F10.6 deg DEdeg Declination in decimal degrees (J2000) 38- 41 I4 km/s HRV [-379/2777]?=99 Heliocentric radial velocity (1) 43- 45 I3 km/s e_HRV [2/194]?=99 Uncertainty in HRV (1) 47- 54 F8.2 arcsec Offset [0.36/11685.2]? Radial offset (only in table 2) 56- 61 F6.2 arcmin Rgal [0.02/173]? Galactocentric radius (not in table 2)
Note (1): We do not quote actual recession velocities for background galaxies as we only applied absorption line templates. These have 99 for the HRV and uncertainty values.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- NGC [3377/7457] SLUGGS galaxy name 6- 14 A9 --- Neighbor Neighboring galaxy name (1) 16- 19 I4 km/s DeltaVsys [-844/1384] Galaxy systemic velocity difference ΔVsys (2) 21- 24 F4.1 arcmin DeltaRgal [0.6/11.6] Galaxy projected galactocentric radius difference ΔR
Note (1): Neighbor galaxies that lie within 12 arcmin on the sky, <1000 km/s in systemic velocity difference and <4 mag difference from the primary SLUGGS galaxy. Note (2): Systemic velocity of SLUGGS galaxy minus that of the neighbor.
History: 25-Apr-2018: From electronic version of the journal 28-Jun-2018: Corrected table5 from erratum
(End) Prepared by AAS, Tiphaine Pouvreau [CDS] 12-Apr-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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