J/AJ/149/53 Radial velocities of 12 Milky Way globular clusters (Kimmig+, 2015)
Measuring consistent masses for 25 Milky Way globular clusters.
Kimmig B., Seth A., Ivans I.I., Strader J., Caldwell N., Anderton T.,
Gregersen D.
<Astron. J., 149, 53 (2015)>
=2015AJ....149...53K 2015AJ....149...53K
ADC_Keywords: Milky Way ; Clusters, globular ; Radial velocities
Keywords: globular clusters: general -
globular clusters: individual (M2, M3, M14, M71, NGC 4147, NGC 5053,
NGC 5466, NGC 6934, 47Tuc, M5, NGC 6441, M12, M15, M53, M92, NGC 6752,
M4, M22, M30, M54, M55, M68, NGC 288, NGC 362)
Abstract:
We present central velocity dispersions, masses, mass-to-light ratios
(M/Ls), and rotation strengths for 25 Galactic globular clusters
(GCs). We derive radial velocities of 1951 stars in 12 GCs from single
order spectra taken with Hectochelle on the MMT telescope. To this
sample we add an analysis of available archival data of individual
stars. For the full set of data we fit King models to derive
consistent dynamical parameters for the clusters. We find good
agreement between single-mass King models and the observed radial
dispersion profiles. The large, uniform sample of dynamical masses we
derive enables us to examine trends of M/L with cluster mass and
metallicity. The overall values of M/L and the trends with mass and
metallicity are consistent with existing measurements from a large
sample of M31 clusters. This includes a clear trend of increasing M/L
with cluster mass and lower than expected M/Ls for the metal-rich
clusters. We find no clear trend of increasing rotation with
increasing cluster metallicity suggested in previous work.
Description:
We present velocity measurements with accurate errors for 1951 stars
in 12 northern Milky Way globular clusters from new data taken with
the multi-object spectrograph Hectochelle on the MMT Observatory on
Mount Hopkins, Arizona. These data are available in Table 5.
Hectochelle is a multi-object spectrograph, with a 1° field of
view (FOV), that uses 240 1.5'' diameter fibers to take single order
spectra at a resolution of ∼38000. The full spectral coverage of the
instrument is 3800-9000Å. Observing is done with an order-selecting
filter that enables multi-object observations of a ∼150Å wide
spectral range. Our data were taken through the RV31 filter, which has
a central wavelength at 5230Å. The region covered by the RV31
filter includes the Mg b triplet (5167-5184Å) , making it possible
to determine velocities, even for the lower signal-to- noise ratio
(S/N) spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 36 Observational information
table5.dat 47 1951 Hectochelle velocities
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See also:
VII/271 : Properties of Galactic Globular Clusters (Francis+, 2014)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/A+A/557/A138 : Detailed chemical abundances in the NGC 362 (Carretta+ 2013)
J/A+A/549/A41 : Horizontal branch stars in 47 Tuc and M5 (Gratton+, 2013)
J/A+A/530/A31 : Stellar parameters in 10 globular cluster fields (Lane+, 2011)
J/A+A/520/A95 : Abundances of red giants in M54 and Sgr dSph (Carretta+, 2010)
J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009)
J/A+A/464/953 : Abundances of red giants in NGC 6441 (Gratton+, 2007)
J/A+A/464/939 : Abundances of red giants in NGC 6218 (Carretta+, 2007)
J/A+A/464/927 : Abundances of red giants in NGC 6752 (Carretta+, 2007)
J/AJ/133/1041 : Velocities and CMT2 photometry in M92 (Drukier+, 2007)
J/ApJS/161/304 : Star clusters in the MW and satellites (McLaughlin+, 2005)
J/AJ/115/708 : Radial Velocities in the Field of M15 (Drukier+ 1998)
J/A+A/324/505 : Core velocity dispersions of globular clusters (Dubath+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Name of the globular cluster (G1)
10- 20 A11 "Y:M:D" Date Date of observation
22- 24 I3 --- Nobs [13/204] Number of stars observed
26 I1 --- Nexp [2/5] Number of exposures
28- 31 I4 s Exp [1200/3600] Exposure time
33- 35 I3 --- N* ? Number of unique stars observed
37- 39 I3 --- Ntid ? Number of stars inside the tidal radius (1)
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Note (1): See Section 3 for details.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Name of the globular cluster (G1)
10- 11 I2 h RAh Hour of Right Ascension (J2000)
13- 14 I2 min RAm Minute of Right Ascension (J2000)
16- 20 F5.2 s RAs Second of Right Ascension (J2000)
22 A1 --- DE- Sign of the Declination (J2000)
23- 24 I2 deg DEd Degree of Declination (J2000)
26- 27 I2 arcmin DEm Arcminute of Declination (J2000)
29- 32 F4.1 arcsec DEs Arcsecond of Declination (J2000)
34- 40 F7.2 km/s RV [-791/746] Radial velocity
42- 47 F6.2 km/s e_RV [0.02/568] Error in RV
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Global Notes:
Note (G1): M2, M3, M5, M14, M15, M53, M71, M92, NGC 4147, NGC 5053, NGC 5466,
and NGC 6934.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 24-Feb-2015