2006MNRAS.368..325P

Query : 2006MNRAS.368..325P

2006MNRAS.368..325P - Mon. Not. R. Astron. Soc., 368, 325-334 (2006/May-1)

Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649.

PIERCE M., BRIDGES T., FORBES D.A., PROCTOR R., BEASLEY M.A., GEBHARDT K., FAIFER F.R., FORTE J.C., ZEPF S.E., SHARPLES R. and HANES D.A.

Abstract (from CDS):

NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this galaxy. Applying the multi-index χ2 minimization technique of Proctor and Sansom with the single stellar population models of Thomas, Maraston and Korn, we derive ages, metallicities and α-element abundance ratios. We find several young (2-3 Gyr old) supersolar metallicity GCs, while the majority are old (>10 Gyr), spanning a range of metallicities from solar to [Z/H]=-2. At least two of these young GCs are at large projected radii of 17-20 kpc. The galaxy itself shows no obvious signs of a recent starburst, interaction or merger. A trend of decreasing α-element ratio with increasing metallicity is found.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): globular clusters: general - galaxies: individual: NGC 4649 - galaxies: star clusters

Nomenclature: Table 1: [PBF2006b] NNNN N=38 among (Nos 68-1574).

Simbad objects: 57

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Number of rows : 57
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 NGC 1052 Bla 02 41 04.79849989 -08 15 20.7519527 11.84 11.41 10.47 10.71   ~ 1397 2
2 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
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 NGC 2434 EmG 07 34 51.1504542360 -69 17 02.996020032 12.82 12.50 11.26 10.84   ~ 192 1
6 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1504 0
7 NGC 3585 GiG 11 13 17.109 -26 45 17.96   10.64   9.22   ~ 304 0
8 NGC 3610 GiG 11 18 25.2827189856 +58 47 10.433735988   11.4       ~ 327 0
9 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 871 0
10 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
11 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
12 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
13 NGC 4647 H2G 12 43 32.542 +11 34 56.89   12.5 12.5     ~ 423 1
14 [LHP2008] 230 GlC 12 43 35.1767860008 +11 36 09.479690856           ~ 4 0
15 [JPB2009] 190.9055045+11.5514988 GlC 12 43 37.203 +11 33 05.95     21.97   20.81 ~ 6 0
16 [LHP2008] 9873 GlC 12 43 37.5155415144 +11 33 03.464925480           ~ 4 0
17 [JPB2009] 190.9100935+11.5359961 GlC 12 43 38.308 +11 32 10.15           ~ 5 0
18 [JPB2009] 190.9111452+11.5441756 GlC 12 43 38.5580775744 +11 32 39.495356196     20.717   19.784 ~ 6 0
19 [PBF2006b] 1182 GlC 12 43 38.818 +11 33 46.84     21.62   20.48 ~ 6 0
20 [JPB2009] 190.9125659+11.5446095 GlC 12 43 38.898 +11 32 41.15           ~ 5 0
21 [JPB2009] 190.9152949+11.5810203 GlC 12 43 39.550 +11 34 52.06           ~ 5 0
22 M 60 GiC 12 43 39.9708251934 +11 33 09.688174067   10.3       ~ 1395 1
23 [JPB2009] 190.9171588+11.5328489 GlC 12 43 40.0019039568 +11 31 58.739061144           ~ 5 0
24 [LHP2008] 349 GlC 12 43 40.363 +11 35 48.09           ~ 4 0
25 [PBF2006b] 1126 GlC 12 43 40.461 +11 31 33.81           ~ 5 0
26 [LHP2008] 9918 GlC 12 43 40.6898660904 +11 33 51.301078056           ~ 4 0
27 [PBB2015] 249 GlC 12 43 41.0115255072 +11 32 09.400112988           ~ 5 0
28 [PBF2006b] 975 GlC 12 43 41.9195437392 +11 32 20.335613460           ~ 5 0
29 [PBF2006b] 899 GlC 12 43 42.5670301848 +11 32 01.531441608           ~ 5 0
30 [JPB2009] 190.9298537+11.5387873 GlC 12 43 43.0424238360 +11 32 20.092691544           ~ 5 0
31 [LHP2008] 811 GlC 12 43 43.469 +11 35 09.84           ~ 4 0
32 [LHP2008] 216 GlC 12 43 43.7359008792 +11 31 44.724627156           ~ 4 0
33 [JPB2009] 190.9372874+11.5483056 GlC 12 43 44.8319231328 +11 32 54.380950152           ~ 5 0
34 [SFL2012] A32 GlC 12 43 45.241 +11 33 18.37           ~ 7 0
35 [PBF2006b] 502 GlC 12 43 46.2435506496 +11 33 34.459725168           ~ 5 0
36 [LHP2008] 661 GlC 12 43 47.009 +11 34 57.49           ~ 4 0
37 [LHP2008] 452 GlC 12 43 47.351 +11 31 56.24           ~ 4 0
38 [LHP2008] 384 GlC 12 43 47.864 +11 31 42.88           ~ 4 0
39 [LHP2008] 144 GlC 12 43 47.9389163232 +11 35 40.017845580           ~ 4 0
40 [LHP2008] 320 GlC 12 43 49.8593712528 +11 32 18.586084128           ~ 4 0
41 [LHP2008] 1081 GlC 12 43 50.249 +11 32 11.39           ~ 4 0
42 [LHP2008] 464 GlC 12 43 50.432 +11 35 59.82           ~ 4 0
43 [LHP2008] 676 GlC 12 43 50.503 +11 33 04.99           ~ 4 0
44 [LHP2008] 607 GlC 12 43 51.084 +11 32 52.95           ~ 4 0
45 [LHP2008] 1201 GlC 12 43 53.183 +11 35 20.64           ~ 4 0
46 [LHP2008] 414 GlC 12 43 53.452 +11 32 18.38           ~ 4 0
47 [LHP2008] 389 GlC 12 43 53.886 +11 31 54.09           ~ 4 0
48 [LHP2008] 746 GlC 12 43 54.511 +11 32 42.23           ~ 4 0
49 [LHP2008] 317 GlC 12 43 55.4647067352 +11 32 12.042894516           ~ 4 0
50 [PBF2006b] 517 Cl* 12 43 56.160 +11 32 20.79           ~ 1 0
51 [LHP2008] 681 GlC 12 43 56.177 +11 32 12.02           ~ 4 0
52 [PBF2006b] 68 GlC 12 43 56.696 +11 32 21.65           ~ 4 0
53 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
54 NGC 5846 rG 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 891 2
55 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
56 NGC 7192 Sy2 22 06 50.1107894976 -64 18 58.721070096   12.21 11.21 10.77   ~ 148 0
57 NAME Local Group GrG ~ ~           ~ 9325 0

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