2018A&A...616A..74K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:06:54

2018A&A...616A..74K - Astronomy and Astrophysics, volume 616A, 74-74 (2018/8-1)

Kinematics of outer halo globular clusters: M 75 and NGC 6426.

KOCH A., HANKE M. and KACHAROV N.

Abstract (from CDS):

Globular clusters (GCs) and their dynamic interactions with the Galactic components provide an important insight into the structure and formation of the early Milky Way. We present a kinematic study of two outer halo GCs based on a combination of VLT/FORS2, VLT/FLAMES, and Magellan/MIKE low- and high-resolution spectroscopy of 32 and 27 member stars, respectively. Although both clusters are located at Galactocentric distances of 15kpc, they have otherwise very different properties. M 75 is a luminous and metal-rich system at [Fe/H]=-1.2dex, which is a value that we confirm from the calcium triplet region. This GC shows mild evidence for rotation with an amplitude of Arot0∼5km/s. One of the most metal-poor GCs in the Milky Way (at [FeII/H]=-2.3dex), NGC 6426 exhibits marginal evidence of internal rotation at the 2km/s level. Both objects have velocity dispersions that are consistent with their luminosity. Although limited by small-number statistics, the resulting limits on their Arot0 ratios suggest that M 75 is a slow rotator driven by internal dynamics rather than being affected by the weak Galactic tides at its large distances. In this work, M 75 (Arot0=0.31) is fully consistent with the properties of other, younger halo clusters. At Arot0=0.8±0.4, NGC 6426 appears to have a remarkably ordered internal motion for its low metallicity, but the large uncertainty does not allow for an unambiguous categorization as a fast rotator. An accretion origin of M 75 cannot be excluded, based on the eccentric orbit, which we derived from the recent data release 2 of Gaia, and considering its younger age.

Abstract Copyright: © ESO 2018

Journal keyword(s): globular clusters: individual: M 75 - globular clusters: individual: NGC 6426 - Galaxy: kinematics and dynamics - Galaxy: structure - Galaxy: halo

Simbad objects: 61

goto Full paper

goto View the reference in ADS

Number of rows : 61

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Sgr Stream St* 02 22 +00.0           ~ 644 0
2 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 263 0
3 2MASS J17444253+0310553 * 17 44 42.53976 +03 10 55.3476           ~ 1 0
4 2MASS J17444382+0307002 * 17 44 43.82136 +03 07 00.2640           ~ 1 0
5 2MASS J17444834+0309220 * 17 44 48.34392 +03 09 22.0572     17.553   16.53 ~ 1 0
6 2MASS J17444900+0309064 * 17 44 49.00944 +03 09 06.4476     16.956   15.93 ~ 1 0
7 2MASS J17444930+0311077 * 17 44 49.30200 +03 11 07.7784     17.948   16.87 ~ 1 0
8 2MASS J17445069+0308026 * 17 44 50.69832 +03 08 02.6628           ~ 1 0
9 2MASS J17445103+0310037 * 17 44 51.03288 +03 10 03.7020     18.430   17.40 ~ 1 0
10 2MASS J17445126+0311247 * 17 44 51.26712 +03 11 24.7848     17.929   16.89 ~ 1 0
11 2MASS J17445141+0310186 * 17 44 51.41280 +03 10 18.6132     17.776   16.69 ~ 1 0
12 2MASS J17445209+0309406 * 17 44 52.09824 +03 09 40.6908     16.681   15.49 ~ 1 0
13 2MASS J17445285+0309180 * 17 44 52.85928 +03 09 18.0792     16.868   15.76 ~ 1 0
14 2MASS J17445302+0311196 * 17 44 53.02512 +03 11 19.6800     17.359   16.29 ~ 1 0
15 2MASS J17445304+0310493 * 17 44 53.04816 +03 10 49.3392     17.401   16.28 ~ 1 0
16 2MASS J17445375+0312564 * 17 44 53.75280 +03 12 56.4984           ~ 1 0
17 2MASS J17445414+0309233 RR* 17 44 54.15 +03 09 23.3   16.9 17.448 15.2 16.35 ~ 4 0
18 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 188 0
19 2MASS J17445554+0311092 * 17 44 55.54272 +03 11 09.2328     17.417   16.32 ~ 1 0
20 2MASS J17445652+0311373 * 17 44 56.52576 +03 11 37.3164     17.369   16.29 ~ 1 0
21 2MASS J17445670+0309393 * 17 44 56.7010324046 +03 09 39.231197977     15.327   14.13 ~ 2 0
22 2MASS J17445681+0310475 * 17 44 56.81568 +03 10 47.5464     16.067   14.86 ~ 1 0
23 2MASS J17445721+0308563 * 17 44 57.21432 +03 08 56.3964     17.125   16.04 ~ 1 0
24 2MASS J17445724+0309540 * 17 44 57.24432 +03 09 54.0360     17.626   16.54 ~ 1 0
25 2MASS J17445800+0310467 * 17 44 58.00752 +03 10 46.7760     18.065   17.03 ~ 1 0
26 2MASS J17450017+0311227 * 17 45 00.17616 +03 11 22.7256     17.716   16.69 ~ 1 0
27 2MASS J17450471+0309391 * 17 45 04.71096 +03 09 39.1608           ~ 1 0
28 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
29 Cl* NGC 6864 KAM 652 HB* 20 05 56.350 -21 54 35.49   16.42 14.63   12.80 ~ 1 0
30 Cl* NGC 6864 KAM 1115 HB* 20 05 58.100 -21 57 34.05   18.76 17.71   16.53 ~ 1 0
31 Cl* NGC 6864 KAM 251 HB* 20 05 58.880 -21 56 42.30 18.814 16.783 14.973   13.177 ~ 2 0
32 Cl* NGC 6864 KAM 1286 HB* 20 06 00.160 -21 54 43.45   17.86 16.62   15.31 ~ 1 0
33 Cl* NGC 6864 KAM 528 HB* 20 06 00.240 -21 55 12.57   16.70 14.69   12.68 ~ 1 0
34 Cl* NGC 6864 KAM 512 HB* 20 06 01.080 -21 55 19.81 18.327 17.082 15.612   14.109 ~ 3 0
35 Cl* NGC 6864 KAM 612 HB* 20 06 01.890 -21 54 46.30 18.194 17.154 15.808   14.421 ~ 2 0
36 Cl* NGC 6864 KAM 239 HB* 20 06 02.230 -21 56 46.35 18.317 17.015 15.527   14.010 ~ 2 0
37 Cl* NGC 6864 KAM 856 HB* 20 06 02.760 -21 53 02.00   18.30 17.16   15.94 ~ 2 0
38 Cl* NGC 6864 KAM 1307 HB* 20 06 02.830 -21 54 20.98   16.93 14.90   12.81 ~ 1 0
39 Cl* NGC 6864 KAM 1459 HB* 20 06 03.190 -21 56 19.60 18.155 16.743 15.189   13.603 ~ 2 0
40 Cl* NGC 6864 KAM 461 HB* 20 06 03.800 -21 55 34.60 18.197 16.616 14.781   12.955 ~ 2 0
41 Cl* NGC 6864 KAM 438 HB* 20 06 04.290 -21 55 40.83   17.03 15.56   14.13 ~ 1 0
42 Cl* NGC 6864 KAM 783 HB* 20 06 04.790 -21 53 46.71   18.58 17.49   16.34 ~ 1 0
43 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 314 0
44 Cl* NGC 6864 KAM 391 HB* 20 06 05.470 -21 55 52.82   16.82 14.87   12.79 ~ 1 0
45 Cl* NGC 6864 KAM 887 HB* 20 06 06.120 -21 52 36.51   17.91 16.68   15.39 ~ 1 0
46 Cl* NGC 6864 KAM 1251 HB* 20 06 06.210 -21 55 02.56 18.100 17.080 15.586   14.087 ~ 2 0
47 Cl* NGC 6864 KAM 1464 HB* 20 06 06.280 -21 56 05.02   17.38 16.03   14.66 ~ 1 0
48 Cl* NGC 6864 KAM 732 HB* 20 06 06.400 -21 54 11.12   17.82 16.50   15.15 ~ 1 0
49 Cl* NGC 6864 KAM 1312 HB* 20 06 06.790 -21 54 15.90 18.548 16.728 14.948   13.188 ~ 3 0
50 Cl* NGC 6864 KAM 442 HB* 20 06 07.180 -21 55 39.80 18.567 16.921 15.305   13.728 ~ 3 0
51 Cl* NGC 6864 KAM 1152 HB* 20 06 07.840 -21 56 13.84   17.36 16.15   14.88 ~ 1 0
52 Cl* NGC 6864 KAM 583 HB* 20 06 07.960 -21 54 52.81 17.688 16.338 14.676   12.908 ~ 2 0
53 Cl* NGC 6864 KAM 876 HB* 20 06 08.040 -21 52 45.44 18.472 17.339 15.913   14.480 ~ 3 0
54 Cl* NGC 6864 KAM 655 HB* 20 06 08.800 -21 54 34.90 18.390 16.926 15.329   13.762 ~ 3 0
55 Cl* NGC 6864 KAM 1328 HB* 20 06 09.090 -21 53 57.87   17.93 17.54   17.06 ~ 1 0
56 Cl* NGC 6864 KAM 827 HB* 20 06 09.620 -21 53 24.57   18.04 16.79   15.49 ~ 2 0
57 Cl* NGC 6864 KAM 503 HB* 20 06 10.890 -21 55 23.10   16.691 14.792   12.957 ~ 2 0
58 Cl* NGC 6864 KAM 486 HB* 20 06 12.760 -21 55 27.40 18.584 17.218 15.761   14.316 ~ 2 0
59 Cl* NGC 6864 KAM 1106 HB* 20 06 13.080 -21 57 59.43   18.46 17.57   16.59 ~ 1 0
60 Cl* NGC 6864 KAM 901 HB* 20 06 17.330 -21 52 20.90 18.610 16.896 15.203   13.568 ~ 2 0
61 Cl* NGC 6864 KAM 483 HB* 20 06 22.550 -21 55 29.30 18.448 16.936 15.328   13.772 ~ 2 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018A&A...616A..74K and select 'bookmark this link' or equivalent in the popup menu


2020.07.03-22:06:55

© Université de Strasbourg/CNRS

    • Contact