2012AJ....143...52S

Query : 2012AJ....143...52S

2012AJ....143...52S - Astron. J., 143, 52 (2012/February-0)

Old massive globular clusters and the stellar halo of the dwarf starburst galaxy NGC 4449.

STRADER J., SETH A.C. and CALDWELL N.

Abstract (from CDS):

We use Hubble Space Telescope imaging to show that the nearby dwarf starburst galaxy NGC 4449 has an unusual abundance of luminous red star clusters. Joint constraints from integrated photometry, low-resolution spectroscopy, dynamical mass-to-light ratios, and resolved color-magnitude diagrams provide evidence that some of these clusters are old globular clusters (GCs). Spectroscopic data for two massive clusters suggest intermediate metallicities ([Fe/H] ~-1) and subsolar Mg enhancement ([Mg/Fe] ~-0.1 to -0.2). One of these clusters may be the nucleus of a tidally disrupting dwarf galaxy; the other is very massive (∼3x106 M☉). We have also identified a population of remote halo GCs. NGC 4449 is consistent with an emerging picture of the ubiquity of stellar halos among dwarf galaxies, and study of its GCs may help distinguish between accretion and in situ scenarios for such halos.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: individual: NGC 4449 - galaxies: star clusters: general - globular clusters: general

VizieR on-line data: <Available at CDS (J/AJ/143/52): table1.dat table3.dat table4.dat table5.dat>

Nomenclature: Table 1: [SSC2012] ANN (Nos A0-A47, B1-B60). Table 4: [SSC2012] SNNN N=13 among (Nos S59-S920). Table 5: [SSC2012] SCN (Nos SC1-SC7).

Simbad objects: 136

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Number of rows : 136
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 1916 Cl* 05 18 37.87 -69 24 22.9   11.16 10.38     ~ 94 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 ESO 121-3 Cl* 06 02 03.32 -60 31 25.6   14.91 14.04     ~ 118 0
5 [SSC2012] SC2 Gl? 12 27 34.7395648128 +44 12 53.551707408           ~ 1 0
6 [SSC2012] S464 Gl? 12 27 47.125 +44 12 04.98           ~ 1 0
7 [SSC2012] S186 Gl? 12 27 48.1602893976 +44 02 55.725796608           ~ 1 0
8 [ATA2011] 81 GlC 12 27 52.8804445080 +44 04 53.079465576   21.662 21.069   20.153 ~ 3 0
9 [SSC2012] S115 GlC 12 27 53.3385907872 +44 04 30.017313228           ~ 1 0
10 [SSC2012] B18 GlC 12 27 54.939 +44 05 19.55   24.725 21.60   22.873 ~ 2 0
11 [SSC2012] B60 GlC 12 27 55.539 +44 05 13.27   22.52 21.85   20.89 ~ 2 0
12 [SSC2012] S59 GlC 12 27 56.561 +44 05 48.38   22.244 21.968   22.045 ~ 2 0
13 [SSC2012] S162 Gl? 12 27 57.0639104640 +44 09 00.248601816           ~ 1 0
14 [ATA2011] 77 GlC 12 27 57.4861462920 +44 05 27.835327068   19.856 19.129   18.145 ~ 6 0
15 [ATA2011] 80 GlC 12 27 57.6161850264 +44 04 44.532696504   21.563 20.849   19.832 ~ 3 0
16 [SSC2012] B44 GlC 12 27 59.081 +44 04 09.29   22.19 21.80   21.31 ~ 1 0
17 [SSC2012] S73 Gl? 12 27 59.4137916432 +44 07 46.912601316           ~ 1 0
18 [ATA2011] 79 GlC 12 27 59.8273331280 +44 04 43.006099152   19.541 18.797   17.802 ~ 5 0
19 [SSC2012] B31 GlC 12 28 00.025 +44 03 10.63   24.296 23.733   22.942 ~ 2 0
20 [SSC2012] B42 Cl* 12 28 01.121 +44 04 36.82   22.901 22.650   21.857 ~ 2 0
21 [SSC2012] B46 GlC 12 28 01.905 +44 05 33.97   25.198 21.11   22.849 ~ 3 0
22 [SSC2012] S267 GlC 12 28 02.4424497960 +44 10 47.707412664           ~ 1 0
23 [ATA2011] 74 GlC 12 28 02.54 +44 05 18.4   22.780 22.599   22.224 ~ 5 0
24 [SSC2012] B48 GlC 12 28 02.553 +44 05 26.89   23.396 23.140   22.670 ~ 2 0
25 [SSC2012] B43 GlC 12 28 02.561 +44 05 01.46   22.79 22.46   22.07 ~ 2 0
26 [ATA2011] 75 GlC 12 28 02.5708510104 +44 04 51.126271428   21.29 20.62   20.993 ~ 5 0
27 [GHG2001] 4 GlC 12 28 02.758 +44 05 04.89   22.947 22.337   21.335 ~ 3 0
28 [ATA2011] 71 GlC 12 28 03.0525128232 +44 05 31.580765808   21.923 21.635   21.260 ~ 3 0
29 [SSC2012] B41 GlC 12 28 03.107 +44 04 40.29   23.117 22.918   22.419 ~ 2 0
30 [SSC2012] A28 GlC 12 28 03.121 +44 07 04.97   24.792 21.51   22.663 ~ 2 0
31 [SSC2012] B56 GlC 12 28 03.243 +44 05 18.51   22.914 22.727   22.300 ~ 2 0
32 [GHG2001] 6 Cl* 12 28 03.247 +44 04 44.39   23.058 22.723   22.088 ~ 3 0
33 [SSC2012] B55 GlC 12 28 03.653 +44 05 16.22   22.767 22.553   22.128 ~ 2 0
34 [SSC2012] B30 GlC 12 28 03.659 +44 04 02.20   23.405 23.202   22.840 ~ 2 0
35 [GHG2001] 7 GlC 12 28 03.8371861968 +44 04 14.936412036   21.403 20.627   19.537 ~ 5 0
36 [SSC2012] B51 GlC 12 28 04.021 +44 05 28.96   23.200 23.084   22.594 ~ 2 0
37 [SSC2012] B54 GlC 12 28 04.112 +44 05 23.72   22.424 22.157   21.425 ~ 2 0
38 [SSC2012] B29 GlC 12 28 04.150 +44 04 00.82   23.269 23.313   23.031 ~ 2 0
39 [ATA2011] 70 GlC 12 28 04.22 +44 05 28.0   21.97 21.68   21.642 ~ 3 0
40 [SSC2012] B53 GlC 12 28 04.226 +44 05 24.70   23.105 22.792   22.211 ~ 2 0
41 [SSC2012] A47 Cl* 12 28 04.511 +44 07 26.29   24.353 23.539   22.709 ~ 2 0
42 [SSC2012] B36 GlC 12 28 04.643 +44 05 07.36   22.728 22.563   21.945 ~ 2 0
43 [GHG2001] 8 GlC 12 28 04.6458623760 +44 04 53.093459784   21.788 21.016   19.980 ~ 5 0
44 [SSC2012] B50 GlC 12 28 04.770 +44 05 25.75 22.974 23.208 22.849   22.192 ~ 2 0
45 [SSC2012] B35 GlC 12 28 05.081 +44 05 16.47   22.915 22.704   22.286 ~ 2 0
46 [SSC2012] B37 GlC 12 28 05.106 +44 05 09.96   22.999 22.937   22.658 ~ 2 0
47 [GHG2001] 9 GlC 12 28 05.526 +44 05 19.99 22.457 22.613 22.306   21.703 ~ 3 0
48 [SSC2012] B58 GlC 12 28 05.817 +44 05 32.06 23.137 23.249 22.932   22.099 ~ 2 0
49 [SSC2012] B57 GlC 12 28 05.951 +44 05 35.33 24.211 24.221 23.560   22.402 ~ 2 0
50 [SSC2012] A46 GlC 12 28 05.977 +44 06 33.47   24.279 23.944   23.482 ~ 2 0
51 [ATA2011] 68 GlC 12 28 06.24 +44 05 16.0 21.815 21.871 21.685   21.215 ~ 4 0
52 [GHG2001] 13 GlC 12 28 06.3957887856 +44 05 54.791424564 20.222 20.125 19.373   18.350 ~ 5 0
53 [GHG2001] 14 GlC 12 28 06.6008688432 +44 06 07.456664880 20.736 20.627 19.870   18.836 ~ 5 0
54 [SSC2012] B38 GlC 12 28 06.759 +44 05 36.94 23.511 23.649 22.888   22.017 ~ 2 0
55 [ATA2011] 69 GlC 12 28 07.02 +44 04 51.8   22.811 22.189   21.168 ~ 3 0
56 [ATA2011] 24 GlC 12 28 07.2729815664 +44 07 21.215820468   21.23 20.42   20.921 ~ 4 0
57 [ATA2011] 63 GlC 12 28 07.3612663608 +44 05 14.708264856 21.977 21.974 21.626   21.022 ~ 4 0
58 [ATA2011] 27 GlC 12 28 07.6767399120 +44 07 13.067648580   21.278 20.510   19.477 ~ 4 0
59 [ATA2011] 66 GlC 12 28 07.8183356304 +44 05 03.169880268 21.601 19.73 19.44   20.751 ~ 3 0
60 [SSC2012] B39 GlC 12 28 07.883 +44 05 14.18 22.852 23.218 22.751   21.741 ~ 2 0
61 [SSC2012] SC3 Gl? 12 28 07.9147101072 +44 08 25.114995636           ~ 1 0
62 [SSC2012] S125 Gl? 12 28 07.9575623352 +44 01 20.259402564           ~ 1 0
63 [SSC2012] B27 GlC 12 28 08.099 +44 03 58.67   24.287 23.973   23.469 ~ 3 0
64 [SSC2012] B32 GlC 12 28 08.377 +44 05 35.69 22.117 22.115 21.737   20.965 ~ 2 0
65 [SSC2012] B2 GlC 12 28 08.520 +44 03 59.17   23.991 23.398   22.528 ~ 3 0
66 [SSC2012] A44 Gl? 12 28 08.733 +44 05 52.41   22.93 21.88   20.74 ~ 2 0
67 [ATA2011] 65 GlC 12 28 08.7748167408 +44 04 51.695389956 21.131 21.204 20.977   20.519 ~ 4 0
68 [SSC2012] A24 GlC 12 28 09.089 +44 06 52.90   18.555 18.596   18.788 ~ 2 0
69 [ATA2011] 67 GlC 12 28 09.3008412336 +44 04 38.685378684 21.580 19.33 19.05   18.43 ~ 4 0
70 [SSC2012] B5 GlC 12 28 09.691 +44 04 54.22 20.981 21.012 20.740   20.091 ~ 2 0
71 [SSC2012] B25 GlC 12 28 10.1826678024 +44 04 22.369191672 20.047 21.215 21.191   21.073 ~ 2 0
72 [ATA2011] 46 GlC 12 28 10.2031897344 +44 05 42.249213312 21.641 21.535 20.826   19.807 ~ 3 0
73 [ATA2011] 34 GlC 12 28 10.2782796576 +44 06 21.048754572 20.154 20.092 19.346   18.362 ~ 6 0
74 [ATA2011] 48 GlC 12 28 10.3100773008 +44 05 35.475763272 19.614 19.609 19.241   18.477 ~ 10 0
75 [ATA2011] 33 GlC 12 28 10.78 +44 06 15.5 22.375 22.376 22.117   21.616 ~ 3 0
76 [SSC2012] B26 GlC 12 28 10.894 +44 04 16.44 23.225 23.548 23.619   23.494 ~ 2 0
77 [SSC2012] B28 GlC 12 28 11.029 +44 04 35.60 21.909 22.386 22.296   21.680 ~ 2 0
78 [GHG2001] 1 GlC 12 28 11.088 +44 05 37.11 16.540 17.478 17.186   16.323 ~ 10 0
79 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
80 [SSC2012] S166 Gl? 12 28 11.2069553640 +44 09 26.775506952           ~ 1 0
81 [SSC2012] B20 GlC 12 28 11.365 +44 05 03.94 23.356 23.087 22.312   21.218 ~ 2 0
82 [ATA2011] 53 GlC 12 28 11.4175547976 +44 05 00.254273532 20.477 20.00 19.78   20.304 ~ 4 0
83 [ATA2011] 14 GlC 12 28 11.6072192544 +44 07 20.441076348   21.049 20.383   19.456 ~ 3 0
84 [ATA2011] 44 Cl* 12 28 11.7012374688 +44 05 27.751548084 22.127 22.297 22.024   21.152 ~ 3 0
85 [SSC2012] B23 Cl* 12 28 11.990 +44 04 56.91 22.539 22.731 22.459   21.870 ~ 2 0
86 [ATA2011] 38 GlC 12 28 12.11 +44 05 39.2 18.350 18.970 17.68   16.63 ~ 4 0
87 [ATA2011] 47 Cl* 12 28 12.21 +44 05 12.6 21.858 22.065 21.841   21.336 ~ 3 0
88 [SSC2012] A42 Cl* 12 28 12.541 +44 06 15.38 21.512 21.874 21.603   20.922 ~ 2 0
89 [SSC2012] A40 Cl* 12 28 12.584 +44 05 38.39 22.721 22.323 21.859   20.910 ~ 2 0
90 [ATA2011] 32 Cl* 12 28 12.81 +44 05 50.1 21.153 21.265 20.957   20.326 ~ 3 0
91 [ATA2011] 26 GlC 12 28 13.23 +44 06 00.1 18.884 19.488 19.466   19.222 ~ 3 0
92 [GHG2001] 44 Cl* 12 28 13.3043513088 +44 05 18.356193348 22.274 22.408 22.068   21.236 ~ 3 0
93 [SSC2012] A25 GlC 12 28 13.495 +44 08 38.13   24.347 23.512   22.444 ~ 2 0
94 [GHG2001] 47 GlC 12 28 13.9522849608 +44 06 42.881267556 18.940 18.965 18.678   18.134 ~ 10 0
95 [SSC2012] A32 Cl* 12 28 14.307 +44 05 30.61 23.724 23.628 22.895   21.909 ~ 2 0
96 [ATA2011] 30 Cl* 12 28 14.3711302488 +44 05 36.762156780 21.813 21.813 21.556   21.010 ~ 3 0
97 [ATA2011] 29 Cl* 12 28 14.45 +44 05 41.9 21.055 21.416 21.164   20.426 ~ 3 0
98 [GHG2001] 48 GlC 12 28 14.5610081760 +44 05 00.116494224 20.804 20.733 19.985   18.907 ~ 5 0
99 [ATA2011] 25 Cl* 12 28 14.61 +44 05 42.5 21.271 22.076 21.833   21.132 ~ 3 0
100 [SSC2012] SC4 Gl? 12 28 14.6402473728 +44 02 55.941505908           ~ 1 0
101 [RPC2011] 30 Cl* 12 28 14.677 +44 05 41.25 21.515 21.749 21.583   21.139 ~ 2 0
102 [ATA2011] 3 GlC 12 28 16.44 +44 07 29.5   23.465 20.13   21.589 ~ 4 0
103 [GHG2001] 53 GlC 12 28 16.5468886080 +44 05 36.244259412 21.421 21.280 20.585   19.632 ~ 5 0
104 [ATA2011] 5 GlC 12 28 16.62 +44 07 05.6 21.781 21.824 21.606   20.945 ~ 3 0
105 [ATA2011] 15 GlC 12 28 16.6515541200 +44 06 11.850364296 20.953 21.235 21.051   20.556 ~ 4 0
106 [ATA2011] 6 GlC 12 28 16.8304869648 +44 06 55.414259604 20.470 18.87 18.59   19.840 ~ 3 0
107 [ATA2011] 17 GlC 12 28 17.51 +44 05 57.8 20.457 19.89 20.625   20.317 ~ 4 0
108 [ATA2011] 7 GlC 12 28 17.5246957728 +44 06 44.987158116 22.406 22.552 21.801   20.657 ~ 3 0
109 [ATA2011] 11 GlC 12 28 17.54 +44 06 10.4 21.439 22.001 21.871   21.587 ~ 4 0
110 [ATA2011] 4 GlC 12 28 17.8429509600 +44 06 55.067466060   21.977 21.623   20.994 ~ 3 0
111 [SSC2012] A34 GlC 12 28 17.980 +44 06 07.57 23.784 23.868 23.388   22.636 ~ 2 0
112 [GHG2001] 59 GlC 12 28 18.7466881152 +44 06 22.735044144 21.299 21.238 20.543   19.602 ~ 5 0
113 [ATA2011] 20 GlC 12 28 18.7801081176 +44 05 19.307601060 23.036 20.53 19.75   18.62 ~ 6 0
114 [SSC2012] A4 GlC 12 28 18.810 +44 05 51.57 22.221 22.524 22.419   22.157 ~ 2 0
115 [SSC2012] A31 Cl* 12 28 18.894 +44 05 27.95 24.953 24.706 24.070   23.256 ~ 3 0
116 [ATA2011] 19 GlC 12 28 19.19 +44 05 32.0 23.267 23.061 22.210   21.037 ~ 4 0
117 [ATA2011] 2 GlC 12 28 19.31 +44 07 29.7   23.294 22.565   21.654 ~ 3 0
118 [SSC2012] A3 GlC 12 28 20.363 +44 05 56.22 23.788 23.757 23.403   22.609 ~ 2 0
119 [SSC2012] A29 GlC 12 28 22.650 +44 06 35.97   22.21 21.52   20.49 ~ 2 0
120 [SSC2012] A30 Cl* 12 28 23.262 +44 06 32.87   24.390 23.824   23.042 ~ 2 0
121 [SSC2012] S212 Gl? 12 28 23.670 +43 59 15.11           ~ 1 0
122 [SSC2012] A2 GlC 12 28 25.026 +44 06 48.76   24.684 21.40   20.47 ~ 2 0
123 [SSC2012] SC1 Gl? 12 28 25.5624217680 +43 59 49.026342768           ~ 1 0
124 [SSC2012] A1 GlC 12 28 26.120 +44 06 45.53   24.706 21.51   22.888 ~ 2 0
125 [ATA2011] 1 GlC 12 28 26.9944938984 +44 07 00.225786540   22.143 20.49   19.41 ~ 3 0
126 [SSC2012] S117 GlC 12 28 27.4118026848 +44 02 40.615401912           ~ 1 0
127 [SSC2012] SC7 Gl? 12 28 27.7486654872 +44 05 56.447477844           ~ 1 0
128 [SSC2012] SC5 Gl? 12 28 31.3087242480 +44 02 31.274749896           ~ 1 0
129 [SSC2012] S121 GlC 12 28 31.4619673728 +44 02 49.093655892           ~ 1 0
130 [SSC2012] SC6 Gl? 12 28 48.124 +44 06 00.45           ~ 1 0
131 [SSC2012] S920 Gl? 12 28 49.4839516800 +44 13 02.206684056           ~ 1 0
132 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
133 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
134 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
135 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
136 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0

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