2012AJ....144..183L

Query : 2012AJ....144..183L

2012AJ....144..183L - Astron. J., 144, 183 (2012/December-0)

Insights into pre-enrichment of star clusters and self-enrichment of dwarf galaxies from their intrinsic metallicity dispersions.

LEAMAN R.

Abstract (from CDS):

Star clusters are known to have smaller intrinsic metallicity spreads than dwarf galaxies due to their shorter star formation timescales. Here we use individual spectroscopic [Fe/H] measurements of stars in 19 Local Group dwarf galaxies, 13 Galactic open clusters, and 49 globular clusters to show that star cluster and dwarf galaxy linear metallicity distributions are binomial in form, with all objects showing strong correlations between their mean linear metallicity  and intrinsic spread in metallicity σ(Z)2. A plot of σ(Z)2 versus  shows that the correlated relationships are offset for the dwarf galaxies from the star clusters. The common binomial nature of these linear metallicity distributions can be explained with a simple inhomogeneous chemical evolution model, where the star cluster and dwarf galaxy behavior in the σ(Z)2 -  diagram is reproduced in terms of the number of enrichment events, covering fraction, and intrinsic size of the enriched regions. The inhomogeneity of the self-enrichment sets the slope for the observed dwarf galaxy σ(Z)2 -  correlation. The offset of the star cluster sequence from that of the dwarf galaxies is due to pre-enrichment, and the slope of the star cluster sequence represents the remnant signature of the self-enriched history of their host galaxies. The offset can be used to separate star clusters from dwarf galaxies without a priori knowledge of their luminosity or dynamical mass. The application of the inhomogeneous model to the σ(Z)2 -  relationship provides a numerical formalism to connect the self-enrichment and pre-enrichment between star clusters and dwarf galaxies using physically motivated chemical enrichment parameters. Therefore we suggest that the σ(Z)2 -  relationship can provide insight into what drives the efficiency of star formation and chemical evolution in galaxies, and is an important prediction for galaxy simulation models to reproduce.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: dwarf - globular clusters: general - open clusters and associations: general

Simbad objects: 85

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Number of rows : 85
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 Cl King 2 OpC 00 50 57.3 +58 11 09   21.39 19.78     ~ 71 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
7 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
8 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
9 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
11 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
12 NGC 2141 OpC 06 02 56.5 +10 26 57           ~ 159 0
13 Cl Trumpler 5 OpC 06 36 31.8 +09 28 03           ~ 146 0
14 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
15 Cl Melotte 66 OpC 07 26 19.2 -47 41 14   8.73       ~ 213 0
16 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
17 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
18 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
19 NAME Pyxis Cluster GlC 09 07 57.80 -37 13 17.0           ~ 123 0
20 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
21 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
22 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
23 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
24 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
25 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
26 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
27 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
28 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
29 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
30 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
31 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
32 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
33 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
34 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
35 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 375 0
36 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
37 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
38 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
39 Cl Lynga 7 OpC 16 11 03.65 -55 19 04.0           ~ 129 0
40 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
41 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 231 0
42 ESO 390-6 GlC 16 28 40.10 -35 21 13.0     12.0     ~ 113 0
43 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
44 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
45 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
46 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
47 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
48 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
49 NGC 6325 GlC 17 17 59.27 -23 45 57.7           ~ 190 0
50 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
51 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 372 1
52 ESO 455-11 GlC 17 31 05.20 -29 58 54.0           ~ 208 0
53 NGC 6380 GlC 17 34 28.00 -39 04 09.0           ~ 175 0
54 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
55 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
56 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
57 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 592 0
58 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
59 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 561 0
60 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 644 0
61 NGC 6558 GlC 18 10 17.6 -31 45 50           ~ 265 0
62 IC 1276 GlC 18 10 44.26 -07 12 27.3           ~ 146 0
63 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 276 0
64 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
65 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
66 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
67 NGC 6739 Sy1 19 07 48.7456741824 -61 22 05.094912360   13.09   11.48   ~ 39 0
68 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
69 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
70 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
71 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
72 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
73 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
74 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
75 NGC 6939 OpC 20 31 40.6 +60 38 54           ~ 171 0
76 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 562 0
77 NGC 7044 OpC 21 13 09.6 +42 29 39     12.0     ~ 72 0
78 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
79 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
80 NGC 7142 OpC 21 45 10.2 +65 47 05   10.36 9.3     ~ 157 0
81 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
82 Cl Berkeley 99 OpC 23 21 03.8 +71 46 44           ~ 41 0
83 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0
84 NAME Sgr Region reg ~ ~           ~ 47 0
85 NAME Local Group GrG ~ ~           ~ 9325 0

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