J/MNRAS/478/1520 Milky Way globular clusters data (Baumgardt+, 2018)
A catalogue of masses, structural parameters, and velocity dispersion profiles
of 112 Milky Way globular clusters.
Baumgardt H., Hilker M.
<Mon. Not. R. Astron. Soc., 478, 1520-1557 (2018)>
=2018MNRAS.478.1520B 2018MNRAS.478.1520B (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, globular ; Stars, masses ;
Radial velocities ; Velocity dispersion ; Optical
Keywords: globular clusters: general - stars: luminosity function, mass function
Abstract:
We have determined masses, stellar mass functions, and structural
parameters of 112 Milky Way globular clusters by fitting a large set
of N-body simulations to their velocity dispersion and surface density
profiles. The velocity dispersion profiles were calculated based on a
combination of more than 15000 high-precision radial velocities which
we derived from archival ESO/VLT and Keck spectra together with
∼20000 published radial velocities from the literature. Our fits also
include the stellar mass functions of the globular clusters, which are
available for 47 clusters in our sample, allowing us to
self-consistently take the effects of mass segregation and ongoing
cluster dissolution into account. We confirm the strong correlation
between the global mass functions of globular clusters and their
relaxation times recently found by Sollima & Baumgardt (2017). We also
find a correlation of the escape velocity from the centre of a
globular cluster and the fraction of first generation stars (FG) in
the cluster recently derived for 57 globular clusters by Milone et al.
(2017), but no correlation between the FG star fraction and the global
mass function of a globular cluster. This could indicate that the
ability of a globular cluster to keep the wind ejecta from the
polluting star(s) is the crucial parameter determining the presence
and fraction of second-generation stars and not its later dynamical
mass loss.
Description:
We have determined individual stellar radial velocities of more than
15000 stars in 90 globular clusters from archival ESO/VLT and Keck
spectra. Combining these data with published literature velocities, we
then calculated radial velocity dispersion profiles of globular
clusters using a maximum-likelihood approach.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 124 112 Derived parameters of all studied globular clusters
tabled.dat 127 11522 Individual stellar radial velocities for stars
in the field of 53 clusters (tables D1-D53)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Note [*] * indicates data in tabled.dat
3- 14 A12 --- Cluster Name of the cluster
16- 19 I4 --- NRV Number of cluster members with measured
radial velocities
21- 26 F6.1 km/s Mean radial velocity of the cluster
28- 31 F4.1 km/s e_ Mean radial velocity of the cluster error
33- 36 F4.2 --- chi2 Reduced chi2 value of the velocity
dispersion fit
38- 43 F6.2 kpc Dist Cluster distance (1)
44 A1 --- n_Dist [ab] Note on Dist (2)
46- 52 E7.3 Msun Mass Total cluster mass
54- 60 E7.3 Msun e_Mass Total cluster mass error
62- 66 F5.2 Msun/Lsun M/LV Total cluster V-band mass-to-light ratio
68- 71 F4.2 Msun/Lsun e_M/LV Total cluster V-band mass-to-light ratio
error
73- 77 F5.2 pc rc Core half-light radius
79- 83 F5.2 pc rnm Half-mass half-light radius
85- 89 F5.2 pc rmlp Projected half-light radius
91- 95 F5.2 [Msun/pc3] logrhoc Central density
97-101 F5.2 [Msun/pc3] logrhonm Density inside the half-mass radius
103-107 F5.2 [yr] logTRH Half-mass relaxation time
109-113 D5.2 --- MFslope Global mass function slope
114 A1 --- n_MFslope [cd] Note on MFslope (2)
116-119 F4.1 km/s sigma0 Mass-weighted central (1D)
velocity dispersion
121-124 F4.1 km/s Vesc Central escape velocity
--------------------------------------------------------------------------------
Note (1): Cluster distance either from literature data or obtained as part of
the fitting process.
Note (2): Note as follows:
a = Cluster distance from literature
b = Fitted cluster distance
c = Global mass function slope determined from observed mass functions
d = Global mass function slope estimated from clusters' relaxation time
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tabled.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Cluster Cluster name
10- 25 A16 --- 2MASS 2MASS ID
29- 38 F10.6 deg RAdeg Right ascension (J2000)
42- 51 F10.6 deg DEdeg Declination (J2000)
55- 61 F7.2 km/s RV Averange radial velocity
67- 70 F4.2 km/s e_RV Averange radial velocity error
75- 80 F6.2 arcsec Dcen Distance from the cluster centre
83- 87 F5.2 mag Jmag ? 2MASS J magnitude
90- 93 F4.2 mag e_Jmag ? 2MASS J magnitude error
97-101 F5.2 mag Kmag ? 2MASS K magnitude
104-107 F4.2 mag e_Kmag ? 2MASS K magnitude error
111-115 F5.3 --- PMemb Membership probability based on the
radial velocity
119 I1 --- o_RV Number of RV measurements
123-127 F5.3 --- PSingle ? Probability that the star has a constant
radial velocity for stars with multiple
radial velocity measurements
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Jun-2021