1999AJ....118..406C


Query : 1999AJ....118..406C

1999AJ....118..406C - Astron. J., 118, 406-420 (1999/July-0)

Kinematics of the galactic globular cluster system: new radial velocities for clusters in the direction of the inner galaxy.

COTE P.

Abstract (from CDS):

The High-Resolution Echelle Spectrometer (HIRES) on the Keck I telescope has been used to measure the first radial velocities for stars belonging to 11 heavily reddened globular clusters in the direction of the inner Galaxy. The sample consists of the clusters Terzan 3, NGC 6256, IC 1257, NGC 6380 (=Ton 1), Ton 2 (=Pismis 26), Djorg 1, NGC 6540 (=Djorg 3), IC 1276 (=Pal 7), Terzan 12, NGC 6749, and Pal 10. Candidate cluster members were selected from a combination of previously published color-magnitude diagrams (CMDs) and new instrumental CMDs obtained with the Palomar 1.5 m telescope. The systemic velocities of Djorg 1 and Pal 10 should be considered provisional, since velocities are available for only two stars. For the remaining nine clusters, we have measured radial velocities for three to nine member stars. Using our HIRES spectra, we estimate metallicities of [Fe/H]≃-0.75 for both Terzan 3 and IC 1276, two clusters lacking previous metallicity estimates. The question of kinematic substructuring among the Galactic globular clusters is investigated using an updated catalog of globular cluster distances, metallicities, and velocities. It is found that the population of metal-rich globular clusters shows significant rotation at all Galactocentric radii. For the metal-rich clusters within 4 kpc of the Galactic center, the measured rotation velocity and line-of-sight velocity dispersion are similar to those of bulge field stars. We investigate claims that the metal-rich clusters are associated with the central Galactic bar by comparing the kinematics of the innermost clusters to that of the atomic hydrogen in the inner Galaxy. The longitude-velocity diagram of both metal-rich and metal-poor clusters bears a remarkable similarity to that of the gas, including the same noncircular motions that have traditionally been interpreted as evidence for a Galactic bar, or, alternatively, a nonaxisymmetric bulge. However, uncertainties in the existing three-dimensional Galactocentric positions for most of the clusters do not yet allow an unambiguous discrimination between the competing scenarios of membership in a rigidly rotating bar or in a bulge that is an oblate isotropic rotator. We conclude that the majority of metal-rich clusters within the central ∼4 kpc of the Galaxy are probably associated with the bulge/bar, and not the thick disk.

Abstract Copyright:

Journal keyword(s): Galaxy: Structure - Galaxy: Kinematics and Dynamics - Galaxy: Formation - Galaxy: Globular Clusters: General

Nomenclature: Table 1: Cl* Terzan 3 C NN (Nos 1-10, No.2 missing), Cl* IC 1257 C N (Nos 1-5), Cl* NGC 6540 C NN N=6 among (Nos 12-62), Cl* IC 1276 C NN N=6 among (Nos 2-10), Cl* NGC 6749 C N (Nos 1-6), Cl* Palomar 10 C N N=2 among (Nos 1-5).

Simbad objects: 69

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Number of rows : 69
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 90861 * 10 29 53.6918682240 +28 34 52.393516824   8.01 6.90     K2III 51 0
2 * c Vir RG* 12 20 20.9813922197 +03 18 45.255217001 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 352 0
3 ESO 390-6 GlC 16 28 40.10 -35 21 13.0     12.0     ~ 88 0
4 Cl* NGC 6256 A 1-8 * 16 59 29.9110197888 -37 07 18.672800232   18.25 15.71     ~ 2 0
5 Cl* NGC 6256 A 1-5 * 16 59 30.1032522456 -37 07 52.057459020   17.62 15.29     ~ 2 0
6 Cl* NGC 6256 A 1-39 * 16 59 30.2554434624 -37 06 33.055866072   18.35 16.20     ~ 2 0
7 Cl* NGC 6256 A 1-11 * 16 59 31.8221437488 -37 07 00.425649540   18.25 15.62     ~ 3 0
8 NGC 6256 GlC 16 59 32.68 -37 07 17.1           ~ 137 0
9 Cl* NGC 6256 A 1-13 * 16 59 33.6166298664 -37 07 01.549388676   18.37 15.94     ~ 2 0
10 Cl* NGC 6256 A 1-14 * 16 59 34.4010398088 -37 06 42.598397988   19.15 15.66     ~ 2 0
11 OGLE BLG997.22 34 WV* 16 59 35.0062939704 -37 07 22.925107524   17.61 15.72   13.413 ~ 3 0
12 Cl* NGC 6256 A 1-20 * 16 59 35.8821766128 -37 07 27.879789540   18.59 16.23     ~ 3 0
13 IC 1257 Bz? 17 27 06.00 -07 05 00.0           ~ 69 0
14 NGC 6380 GlC 17 34 28.00 -39 04 09.0           ~ 122 0
15 Ton 2 GlC 17 36 10.500 -38 33 12.00           ~ 82 0
16 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13094 0
17 NAME cl Djorgovski 1 GlC 17 47 28.30 -33 03 56.0           ~ 68 0
18 NGC 6540 GlC 18 06 08.60 -27 45 55.0           ~ 106 0
19 IC 1276 GlC 18 10 44.26 -07 12 27.3           ~ 111 0
20 ESO 522-1 GlC 18 12 15.80 -22 44 31.0     14.86     ~ 86 1
21 NGC 6749 GlC 19 05 15.36 +01 54 00.0     12.4     ~ 143 0
22 GCl 111 GlC 19 18 02.10 +18 34 18.0           ~ 98 0
23 * b Aql PM* 19 24 58.1999714302 +11 56 39.888480530 6.35 5.93   4.7   G7IVHdel1 471 0
24 * gam Aql * 19 46 15.5802908 +10 36 47.740788 5.93 4.23 2.72 1.65 0.87 K3II 430 0
25 HD 223311 V* 23 48 32.4794141016 -06 22 49.524743316   7.526 6.069     K2/3III 55 0
26 Cl* NGC 6540 C 57 * ~ ~           ~ 1 0
27 Cl* NGC 6540 C 62 * ~ ~           ~ 1 0
28 Cl* IC 1276 C 2 * ~ ~           ~ 1 0
29 Cl* IC 1276 C 3 * ~ ~           ~ 1 0
30 Cl* IC 1276 C 4 * ~ ~           ~ 1 0
31 Cl* IC 1276 C 5 * ~ ~           ~ 1 0
32 Cl* IC 1276 C 6 * ~ ~           ~ 1 0
33 Cl* IC 1276 C 10 * ~ ~           ~ 1 0
34 Cl* Terzan 12 OBB 294 * ~ ~     18.95     ~ 1 0
35 Cl* Terzan 12 OBB 410 * ~ ~     18.33     ~ 1 0
36 Cl* Terzan 12 OBB 428 * ~ ~     18.75     ~ 1 0
37 Cl* NGC 6749 C 1 * ~ ~           ~ 1 0
38 Cl* NGC 6749 C 2 * ~ ~           ~ 1 0
39 Cl* NGC 6749 C 3 * ~ ~           ~ 1 0
40 Cl* NGC 6749 C 4 * ~ ~           ~ 1 0
41 Cl* NGC 6749 C 5 * ~ ~           ~ 1 0
42 Cl* NGC 6749 C 6 * ~ ~           ~ 1 0
43 NAME Galactic Bar reg ~ ~           ~ 1059 0
44 Cl* Palomar 10 C 5 * ~ ~           ~ 1 0
45 Cl* Palomar 10 C 1 * ~ ~           ~ 1 0
46 Cl* Pismis 26 BOB 3258 * ~ ~     17.47     ~ 2 0
47 Cl* Pismis 26 BOB 3633 * ~ ~     17.03     ~ 2 0
48 Cl* Pismis 26 BOB 3644 * ~ ~     17.13     ~ 2 0
49 Cl* Terzan 3 C 1 * ~ ~           ~ 1 0
50 Cl* Terzan 3 C 3 * ~ ~           ~ 1 0
51 Cl* Terzan 3 C 4 * ~ ~           ~ 1 0
52 Cl* Terzan 3 C 5 * ~ ~           ~ 1 0
53 Cl* Terzan 3 C 6 * ~ ~           ~ 1 0
54 Cl* Terzan 3 C 7 * ~ ~           ~ 1 0
55 Cl* Terzan 3 C 8 * ~ ~           ~ 1 0
56 Cl* Terzan 3 C 9 * ~ ~           ~ 1 0
57 Cl* Terzan 3 C 10 * ~ ~           ~ 1 0
58 Cl* IC 1257 A 1 * ~ ~           ~ 1 0
59 Cl* IC 1257 A 2 * ~ ~           ~ 1 0
60 Cl* IC 1257 A 3 * ~ ~           ~ 1 0
61 Cl* IC 1257 A 4 * ~ ~           ~ 1 0
62 Cl* IC 1257 A 5 * ~ ~           ~ 1 0
63 Cl* NGC 6380 OBB 977 * ~ ~     18.30     ~ 1 0
64 Cl* NGC 6380 OBB 894 * ~ ~     18.33     ~ 1 0
65 Cl* NGC 6380 OBB 1066 * ~ ~     18.28     ~ 1 0
66 Cl* NGC 6540 C 12 * ~ ~           ~ 1 0
67 Cl* NGC 6540 C 16 * ~ ~           ~ 1 0
68 Cl* NGC 6540 C 27 * ~ ~           ~ 1 0
69 Cl* NGC 6540 C 31 * ~ ~           ~ 1 0

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2022.08.14-18:42:58

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