2018A&A...620A.194R


Query : 2018A&A...620A.194R

2018A&A...620A.194R - Astronomy and Astrophysics, volume 620A, 194-194 (2018/12-1)

From globular clusters to the disc: the dual life of our Galaxy.

RECIO-BLANCO A.

Abstract (from CDS):

The halo and disc globular cluster population can be used as a tracer of the primordial epochs of the Milky Way formation. In this work, literature data of globular clusters ages, chemical abundances, and structural parameters are studied, explicitly focussing on the origin of the known split in the age-metallicity relation (AMR) of globular clusters. When the α-element abundances, which are less strongly affected by the internal light-element spread of globular clusters (Si, Ca), are considered, a very low observational scatter among metal-poor clusters is observed. A plateau at [SiCa/Fe], ∼0.35dex, with a dispersion of only 0.05dex (including abundance errors) is observed up to a metallicity of about -0.75dex. Only a few metal-poor clusters in this metallicity interval present low [SiCa/Fe] abundances. Moreover, metal-rich globular clusters show a knee in the [α/Fe] vs. [Fe/H] plane around [Fe/H]~-0.75dex. As a consequence, if a substantial fraction of galactic globular clusters has an external origin, they have to be mainly formed either in galaxies that are massive enough to ensure high levels of α-element abundances even at intermediate metallicity, or in lower mass dwarf galaxies accreted by the Milky Way in their early phases of formation. Finally, clusters in the metal-poor branch of the AMR present an anti-correlation of [SiCa/Fe] with the total cluster magnitude, while this is not the case for metal-rich branch clusters. In addition, this lack of faint high-α clusters in the young metal-poor population is in contrast with what is observed for old and more metal-poor clusters, possibly reflecting a higher heterogeneity of formation environments at lower metallicity. Accretion of high-mass satellites, as a major contribution to the current Milky Way globular cluster system both in the metal-poor and the metal-intermediate regime is compatible with the observations.

Abstract Copyright: © ESO 2018

Journal keyword(s): globular clusters: general - Galaxy: halo - Galaxy: stellar content

Simbad objects: 64

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Number of rows : 64
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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3748 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 991 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1019 0
4 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 476 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1341 0
6 NAME PYX GLOBULAR CL GlC 09 07 57.80 -37 13 17.0           ~ 94 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1345 0
8 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 804 0
9 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 542 0
10 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 348 0
11 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 942 0
12 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 389 0
13 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 780 0
14 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 584 0
15 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2384 0
16 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 408 0
17 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 785 0
18 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 330 0
19 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1887 0
20 NGC 5927 GlC 15 28 00.69 -50 40 22.9   10.13 8.86     ~ 434 0
21 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 341 0
22 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1771 0
23 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 268 0
24 NGC 6144 GlC 16 27 13.86 -26 01 24.6   10.55 9.63     ~ 226 0
25 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 753 0
26 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2115 0
27 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 629 0
28 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 749 0
29 NGC 6304 GlC 17 14 32.25 -29 27 43.3   10.33 9.03     ~ 332 0
30 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2006 0
31 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 371 0
32 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 287 0
33 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 540 0
34 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1892 1
35 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 205 0
36 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 208 0
37 NGC 6535 GlC 18 03 50.51 -00 17 51.5   11.35 9.85     ~ 271 0
38 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 350 1
39 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 268 0
40 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 833 1
41 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 440 1
42 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 397 0
43 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1304 0
44 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 357 0
45 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1988 2
46 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1007 0
47 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 224 0
48 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 473 0
49 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1910 0
50 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 397 0
51 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 402 0
52 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 971 0
53 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 334 0
54 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 813 0
55 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 296 0
56 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1078 0
57 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 397 0
58 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 507 0
59 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3037 0
60 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 972 1
61 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 987 0
62 NGC 7098 G 21 44 16.1497974000 -75 06 40.864242528   12.33 11.37 10.84 11.5 ~ 80 0
63 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 492 0
64 NAME Local Group GrG ~ ~           ~ 7768 0

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2022.09.28-02:23:02

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