2012ApJ...759..116P

Query : 2012ApJ...759..116P

2012ApJ...759..116P - Astrophys. J., 759, 116 (2012/November-2)

The globular cluster system of NGC 4636 and formation of globular clusters in giant elliptical galaxies.

PARK H.S., LEE M.G., HWANG H.S., KIM S.C., ARIMOTO N., YAMADA Y., TAMURA N. and ONODERA M.

Abstract (from CDS):

We present a spectroscopic analysis of the metallicities, ages, and alpha-elements of the globular clusters (GCs) in the giant elliptical galaxy (gE) NGC 4636 in the Virgo Cluster. Line indices of the GCs are measured from the integrated spectra obtained with Faint Object Camera and Spectrograph on the Subaru 8.2 m Telescope. We derive [Fe/H] values of 59 GCs based on the Brodie & Huchra method, and [Z/H], age, and [α/Fe] values of 33 GCs from the comparison of the Lick line indices with single stellar population models. The metallicity distribution of NGC 4636 GCs shows a hint of a bimodality with two peaks at [Fe/H] = -1.23(σ = 0.32) and -0.35(σ = 0.19). The age spread is large from 2 Gyr to 15 Gyr and the fraction of young GCs with age <5 Gyr is about 27%. The [α/Fe] of the GCs shows a broad distribution with a mean value [α/Fe] ~0.14 dex. The dependence of these chemical properties on the galactocentric radius is weak. We also derive the metallicities, ages, and [α/Fe] values for the GCs in other nearby gEs (M87, M49, M60, NGC 5128, NGC 1399, and NGC 1407) from the line index data in the literature using the same methods as used for NGC 4636 GCs. The metallicity distribution of GCs in the combined sample of seven gEs including NGC 4636 is found to be bimodal, supported by the KMM test with a significance level of >99.9%. All these gEs harbor some young GCs with ages less than 5 Gyr. The mean age of the metal-rich GCs ([Fe/H] >-0.9) is about 3 Gyr younger than that of the metal-poor GCs. The mean value of [α/Fe] of the gE GCs is smaller than that of the Milky Way GCs. We discuss these results in the context of GC formation in gEs.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: individual (NGC 4636, M87, M49, M60, NGC 5128, NGC 1399, NGC 1407) - galaxies: star clusters: general

VizieR on-line data: <Available at CDS (J/ApJ/759/116): table2.dat table3.dat table4.dat table5.dat table6.dat>

Simbad objects: 79

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Number of rows : 79
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 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
3 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
4 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
5 NAME Eridanus ClG GrG 03 38 32.00 -22 18 51.0           ~ 200 0
6 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1126 1
9 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
10 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
11 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
12 [PLH2010] 148 GlC 12 42 28.2376483464 +02 43 24.761380368       19.88   ~ 4 0
13 [PLH2010] 361 GlC 12 42 30.8461154160 +02 44 41.203845528       20.69   ~ 4 0
14 [PLH2010] 285 GlC 12 42 34.5959987088 +02 46 47.470279260       20.51   ~ 4 0
15 [PLH2010] 279 GlC 12 42 34.8130725816 +02 46 59.331484704       20.46   ~ 4 0
16 2XMM J124236.3+024637 GlC 12 42 36.3756099360 +02 46 37.236310212       19.94   ~ 5 0
17 [PLH2010] 152 GlC 12 42 36.8794873296 +02 45 26.298304488       19.86   ~ 4 0
18 [PLH2010] 10031 GlC 12 42 39.99 +02 45 16.2           ~ 2 0
19 [PLH2010] 182 GlC 12 42 40.81 +02 39 55.4           ~ 2 0
20 [PLH2010] 443 GlC 12 42 42.3966903168 +02 41 26.106542988       20.75   ~ 4 0
21 [PLH2010] 369 GlC 12 42 43.1098688088 +02 42 49.741136460           ~ 3 0
22 [PLH2010] 321 GlC 12 42 43.1552672400 +02 41 46.468428108       20.52   ~ 4 0
23 [PLH2010] 194 GlC 12 42 44.3455875432 +02 38 12.744304008       20.16   ~ 4 0
24 [PLH2010] 227 GlC 12 42 44.7149467752 +02 39 04.936530312       20.30   ~ 4 0
25 [PLH2010] 10005 GlC 12 42 47.07 +02 42 19.3           ~ 2 0
26 [PLH2010] 112 GlC 12 42 48.2332685304 +02 40 10.024763736           ~ 3 0
27 [PLH2010] 429 GlC 12 42 48.29 +02 40 18.1           ~ 2 0
28 [PLH2010] 244 GlC 12 42 49.29 +02 42 09.0           ~ 2 0
29 [PLH2010] 10021 GlC 12 42 49.45 +02 41 38.5           ~ 2 0
30 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1156 1
31 [PLH2010] 256 GlC 12 42 49.9059480408 +02 39 21.974445180       20.40   ~ 4 0
32 [PLH2010] 157 GlC 12 42 50.27 +02 43 24.4           ~ 2 0
33 [PLH2010] 393 GlC 12 42 51.02 +02 42 33.4           ~ 2 0
34 [PLH2010] 9995 GlC 12 42 51.02 +02 40 57.6           ~ 2 0
35 [PLH2010] 475 GlC 12 42 51.60 +02 38 22.6           ~ 2 0
36 [PLH2010] 234 GlC 12 42 51.6054236760 +02 39 46.355579496       20.34   ~ 4 0
37 [PLH2010] 224 GlC 12 42 52.3136647704 +02 39 39.020795784       20.28   ~ 4 0
38 [SRD2006] 1.1 44 GlC 12 42 53.2832869992 +02 38 43.785638340       19.64   ~ 4 0
39 [PLH2010] 350 GlC 12 42 53.63 +02 43 31.3           ~ 2 0
40 [PLH2010] 252 GlC 12 42 54.1850969976 +02 50 39.736811904           ~ 3 0
41 [PLH2010] 427 GlC 12 42 54.41 +02 40 47.8           ~ 2 0
42 [PLH2010] 115 GlC 12 42 55.29 +02 43 13.2           ~ 2 0
43 [PLH2010] 345 GlC 12 42 55.6611799320 +02 38 51.639967464           ~ 3 0
44 [PLH2010] 501 GlC 12 42 55.70 +02 49 49.7           ~ 3 0
45 [PLH2010] 107 GlC 12 42 56.1920013504 +02 47 50.148882276       19.54   ~ 4 0
46 [PLH2010] 437 GlC 12 42 56.31 +02 38 41.0           ~ 2 0
47 [PLH2010] 131 GlC 12 42 57.4989601224 +02 38 30.055637148           ~ 3 0
48 [PLH2010] 445 GlC 12 42 59.52 +02 40 13.4           ~ 2 0
49 [PLH2010] 117 GlC 12 42 59.82 +02 43 01.9           ~ 2 0
50 [PLH2010] 183 GlC 12 43 00.1640239800 +02 35 32.142941628           ~ 3 0
51 [PLH2010] 365 GlC 12 43 02.6966414880 +02 46 37.331051592       20.73   ~ 4 0
52 [PLH2010] 311 GlC 12 43 02.83 +02 43 28.9           ~ 2 0
53 [PLH2010] 230 GlC 12 43 03.16 +02 50 52.7           ~ 2 0
54 [PLH2010] 448 GlC 12 43 03.49 +02 47 27.1       20.99   ~ 4 0
55 [PLH2010] 199 GlC 12 43 03.7147983456 +02 37 37.098176736           ~ 3 0
56 [PLH2010] 231 GlC 12 43 03.9824133312 +02 44 26.859863436           ~ 3 0
57 [PLH2010] 304 GlC 12 43 04.5543233712 +02 47 17.432888028       20.59   ~ 4 0
58 [PLH2010] 150 GlC 12 43 05.4677577024 +02 45 48.755447388       19.91   ~ 4 0
59 [PLH2010] 118 GlC 12 43 06.5592614280 +02 39 53.308502532       19.76   ~ 4 0
60 [PLH2010] 189 GlC 12 43 06.7899318336 +02 42 43.867886004       20.13   ~ 4 0
61 [PLH2010] 225 GlC 12 43 07.4547465720 +02 43 45.548188716       20.28   ~ 4 0
62 [PLH2010] 422 GlC 12 43 07.4818278720 +02 46 10.279063128           ~ 3 0
63 [PLH2010] 386 GlC 12 43 07.61 +02 48 58.5           ~ 2 0
64 [PLH2010] 323 GlC 12 43 08.2682643864 +02 41 25.352750184       20.64   ~ 4 0
65 [PLH2010] 82 GlC 12 43 08.3498663040 +02 46 50.019897000       19.33   ~ 4 0
66 [PLH2010] 164 GlC 12 43 08.8898905512 +02 41 55.016746944       19.99   ~ 4 0
67 [PLH2010] 158 GlC 12 43 09.0437128584 +02 42 06.081128748       20.02   ~ 4 0
68 [PLH2010] 138 GlC 12 43 09.2864502696 +02 39 33.141479328       19.85   ~ 4 0
69 [PLH2010] 303 GlC 12 43 11.4322844544 +02 40 01.241153040       20.59   ~ 4 0
70 [PLH2010] 210 GlC 12 43 15.37 +02 38 52.4           ~ 3 0
71 [PLH2010] 108 GlC 12 43 17.02 +02 44 42.5           ~ 2 0
72 M 60 GiC 12 43 39.9708251934 +11 33 09.688174067   10.3       ~ 1395 1
73 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
74 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
75 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 456 0
76 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
77 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
78 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
79 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1

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