2010ApJ...708.1335W


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST14:22:01

2010ApJ...708.1335W - Astrophys. J., 708, 1335-1356 (2010/January-2)

The ages, metallicities, and alpha element enhancements of globular clusters in the elliptical NGC 5128: a homogeneous spectroscopic study with Gemini/Gemini multi-object spectrograph.

WOODLEY K.A., HARRIS W.E., PUZIA T.H., GOMEZ M., HARRIS G.L.H. and GEISLER D.

Abstract (from CDS):

We present new integrated light spectroscopy of globular clusters (GCs) in NGC 5128, a nearby giant elliptical galaxy less than 4 Mpc away, in order to measure radial velocities and derive ages, metallicities, and alpha-element abundance ratios. Using the Gemini South 8 meter telescope with the instrument Gemini Multi-Object Spectrograph, we obtained spectroscopy in the range of ∼3400-5700 Å for 72 GCs with a signal-to-noise ratio greater than 30 Å–1; and we have also discovered 35 new GCs within NGC 5128 from our radial velocity measurements. We measured and compared the Lick indices from HδA through Fe5406 with the single stellar population models of Thomas et al. in order to derive age, metallicity, and [α/Fe] values. We also measure Lick indices for 41 Milky Way GCs from Puzia et al. and Schiavon et al. with the same methodology for direct comparison. Our results show that 68% of the NGC 5128 GCs have old ages (>8 Gyr), 14% have intermediate ages (5-8 Gyr), and 18% have young ages (<5 Gyr). However, when we look at the metallicity of the GCs as a function of age, we find 92% of metal-poor GCs and 56% of metal-rich GCs in NGC 5128 have ages >8 Gyr, indicating that the majority of both metallicity subpopulations of GCs formed earlier, with a significant population of young and metal-rich GCs forming later. Our metallicity distribution function generated directly from spectroscopic Lick indices is clearly bimodal, as is the color distribution of the same set of GCs. Thus, the metallicity bimodality is real and not an artifact of the color to metallicity conversion. However, the metallicity distribution function obtained from comparison with the single stellar population models is consistent with a unimodal, bimodal, or multimodal shape. The [α/Fe] values are supersolar with a mean value of 0.14±0.04, indicating a fast formation timescale. However, the GCs in NGC 5128 are not as [α/Fe] enhanced as the Milky Way GCs also examined in this study. Our measured indices also indicate that the GCs in NGC 5128 may have a slight overabundance in nitrogen and a wider range of calcium strength compared to the Milky Way GCs. Our results support a rapid, early formation of the GC system in NGC 5128, with subsequent major accretion and/or GC and star-forming events in more recent times.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: individual: NGC 5128 - galaxies: star clusters - globular clusters: general

VizieR on-line data: <Available at CDS (J/ApJ/708/1335): table2.dat table3.dat table4.dat table5.dat>

Nomenclature: Table 3: [WHB2007] GCNNNN (Nos 0445-0479) added.

Simbad objects: 152

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Number of rows : 152

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 3969 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11271 1
2 CPD-69 177 WD* 03 10 31.0201840720 -68 36 03.381441176 10.757 11.413 11.394 11.47 11.558 DA3.0 239 0
3 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1475 1
4 NGC 3115 GiG 10 05 13.978 -07 43 06.89   11   9.37   ~ 944 2
5 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1397 0
6 LAWD 37 WD* 11 45 42.9170659451 -64 50 29.464090822 11.08 11.725 11.513 11.34 11.163 DQ 238 0
7 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1287 1
8 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 806 0
9 [WHB2007] GC0445 GlC 13 24 40.51 -43 01 56.7           ~ 3 0
10 [PFF2004] gc 15 GlC 13 24 41.18 -43 01 45.6 20.27 20.01 19.22 18.74 18.15 ~ 7 0
11 [PFF2004] gc 17 GlC 13 24 43.6099055569 -42 58 16.406432419 20.54 20.32 19.51 18.99 18.47 ~ 8 0
12 [WHH2005] 5 GlC 13 24 44.575 -43 02 47.26 20.47 20.03 19.06 18.49 17.87 ~ 5 0
13 [BBP2008] AAT109711 GlC 13 24 45.3327094255 -42 59 33.513890212 19.88 19.87 19.30 18.90 18.33 ~ 5 0
14 [BBP2008] AAT109788 GlC 13 24 45.7530664751 -43 02 24.569327860 21.82 21.02 19.89 19.23 18.56 ~ 6 0
15 [PFF2004] gc 18 GlC 13 24 47.0739504355 -43 06 01.741434002 20.90 20.03 18.91 18.25 17.54 ~ 7 0
16 [HGH92] G277 GlC 13 24 47.3534460551 -42 58 29.869151003 20.26 19.96 19.10 18.56 18.02 ~ 10 0
17 [PFF2004] gc 19 GlC 13 24 48.9492495407 -42 57 48.464489255 20.10 19.87 19.05 18.53 18.00 ~ 6 0
18 [PFF2004] gc 20 GlC 13 24 50.457 -42 59 48.98 20.57 20.33 19.53 19.00 18.47 ~ 5 0
19 [WHB2007] GC0446 GlC 13 24 50.46 -43 04 51.0           ~ 3 0
20 [WHB2007] GC0447 GlC 13 24 50.90 -42 59 59.0           ~ 1 0
21 [VHH81] 100 GlC 13 24 52.0939603199 -43 04 32.787371458     20.08     ~ 7 0
22 [HGH92] G302 GlC 13 24 53.2661100650 -43 04 34.811128753 20.30 20.01 19.20 18.69 18.16 ~ 10 0
23 [WHB2007] GC0448 GlC 13 24 53.64 -42 57 59.1           ~ 3 0
24 [HGH2004] 201.22484-43.01212 GlC 13 24 53.9649745054 -43 00 43.676058761           ~ 5 0
25 [PFF2004] gc 22 GlC 13 24 54.3040702890 -43 03 15.448570750 20.72 20.58 19.84 19.37 18.90 ~ 10 0
26 [VHH81] 11 GlC 13 24 54.7051627040 -43 01 21.762822596 19.55 18.96 17.91 17.26 16.61 ~ 19 0
27 [WHB2007] GC0450 GlC 13 24 54.97 -43 02 52.4           ~ 1 0
28 [BBP2008] AAT111406 GlC 13 24 55.29 -43 03 15.6 21.84 21.15 20.13 19.50 18.80 ~ 3 0
29 [WHB2007] GC0451 GlC 13 24 55.4187549470 -42 59 48.554196787           ~ 3 0
30 [WHB2007] GC0420 GlC 13 24 55.9718943527 -43 02 15.900272659       19.87   ~ 4 0
31 [HGH92] G279 GlC 13 24 56.2441576389 -43 03 23.496664474 19.97 19.91 19.45 19.17 18.88 ~ 8 0
32 [VHH81] 31 GlC 13 24 57.4206103051 -43 01 08.182464115 20.09 19.42 18.38 17.75 17.06 ~ 13 0
33 [HGH92] G369 GlC 13 24 57.4963357189 -42 59 23.338450971 19.82 19.58 18.74 18.22 17.69 ~ 7 0
34 [PFF2004] gc 25 GlC 13 24 57.53 -43 05 32.7 21.50 21.02 20.02 19.39 18.67 ~ 9 0
35 [WHB2007] GC0452 GlC 13 24 57.76 -42 58 51.6           ~ 3 0
36 [HGH2004] 201.24254-42.93612 GlC 13 24 58.19 -42 56 10.3 19.34 18.73 17.71 17.10 16.44 ~ 27 0
37 [WHB2007] GC0453 GlC 13 24 58.5879314942 -42 58 16.607513339           ~ 3 0
38 [PFF2004] gc 27 GlC 13 25 00.6230112730 -43 05 30.327591978 21.22 20.75 19.74 19.13 18.45 ~ 8 0
39 EQ J1325-4254 GlC 13 25 01.589 -42 54 40.82 19.97 19.75 19.37 19.06 18.71 ~ 15 1
40 [PFF2004] gc 30 GlC 13 25 01.7060646947 -43 00 09.897365059 21.68 20.94 19.89 19.26 18.54 ~ 5 0
41 [WHB2007] GC0454 GlC 13 25 02.82 -43 02 04.4           ~ 2 0
42 [KKF2001] J132503.04-425625.09 GlC 13 25 03.11 -42 56 25.3 20.47 19.94 18.93 18.32 17.67 ~ 11 0
43 [HGH92] G 66 GlC 13 25 03.1552979984 -43 03 02.537080440 20.26 19.67 18.68 18.15 17.44 ~ 7 0
44 [BBP2008] AAT112752 GlC 13 25 04.1166317936 -43 00 19.704859038 20.51 20.16 19.34 18.88 18.44 ~ 4 0
45 [WHH2005] 7 GlC 13 25 05.01 -42 57 15.3 18.96 18.39 17.41 16.81 16.19 ~ 6 0
46 [WHB2007] GC0455 GlC 13 25 05.02 -43 01 33.6           ~ 2 0
47 [HGH92] G 35 GlC 13 25 05.2645700853 -42 58 05.781621269 21.02 20.59 19.62 19.01 18.41 ~ 8 0
48 [HGH92] G342 GlC 13 25 05.83 -42 59 00.6 19.65 19.14 18.18 17.57 16.96 ~ 6 0
49 [WHB2007] GC0456 GlC 13 25 06.72 -42 59 17.1           ~ 2 0
50 [WHB2007] GC0457 GlC 13 25 06.8164582942 -42 57 32.196246062           ~ 3 0
51 [WHB2007] GC0424 GlC 13 25 06.8722368980 -43 02 40.292900853           ~ 3 0
52 [BBP2008] AAT113428 GlC 13 25 07.3075947821 -43 06 20.654187237 21.25 20.92 20.04 19.49 18.93 ~ 5 0
53 [WHH2005] 8 GlC 13 25 07.625 -43 01 15.20 19.83 19.16 18.12 17.46 16.82 ~ 7 0
54 [WHB2007] GC0458 GlC 13 25 07.69 -42 55 49.6           ~ 3 0
55 [HHG2004] 47 GlC 13 25 08.5063892996 -43 02 57.522741899 20.59 19.95 18.91 18.37 17.64 ~ 11 0
56 [PFF2004] gc 38 GlC 13 25 08.8000134777 -43 04 14.961130524 20.83 20.29 19.29 18.69 18.03 ~ 5 0
57 [KKF2001] J132509.20-425859.64 GlC 13 25 09.20 -42 58 59.6 19.13 18.65 17.71 17.13 16.55 ~ 9 0
58 [WHB2007] GC0425 GlC 13 25 09.595 -43 04 37.92       20.11   ~ 4 0
59 [KKF2001] J132510.21-425510.46 GlC 13 25 10.24 -42 55 09.5 21.07 20.47 19.46 18.90 18.21 ~ 9 0
60 [HGH2004] 201.29642-43.05266 GlC 13 25 11.1413289618 -43 03 09.632227666 20.57 20.32 19.51 18.99 18.48 ~ 16 0
61 [HGH92] G 81 GlC 13 25 12.0905705693 -42 57 25.263555864 19.90 19.52 18.62 18.05 17.49 ~ 7 0
62 [R2001b] f2.GC-61 GlC 13 25 12.8699131968 -43 07 59.240462217 19.65 19.15 18.20 17.60 17.03 ~ 19 0
63 [R2001b] f2.GC-59 GlC 13 25 13.861 -43 07 32.56 22.13 21.70 20.70 20.11 19.48 ~ 7 0
64 [WHB2007] GC0426 GlC 13 25 14.180 -43 04 46.63       19.87   ~ 4 0
65 [HGH2004] 201.30934-43.12320 GlC 13 25 14.2361717636 -43 07 23.606318777 21.26 20.63 19.55 18.90 18.21 ~ 11 0
66 [BBP2008] AAT114769 GlC 13 25 15.099 -42 57 45.54 21.20 21.00 20.25 19.76 19.25 ~ 5 0
67 [BBP2008] AAT114913 GlC 13 25 15.905 -43 06 03.35 21.69 21.33 20.39 19.88 19.29 ~ 6 0
68 [PFF2004] gc 49 GlC 13 25 16.0443871740 -43 05 06.528151658 20.74 20.45 19.59 19.05 18.50 ~ 7 0
69 [WHB2007] GC0459 GlC 13 25 17.67 -42 56 13.9           ~ 2 0
70 [R2001b] f2.GC-47 GlC 13 25 19.95 -43 07 43.7 21.86 21.20 20.11 19.40 18.62 ~ 5 0
71 [WHB2007] GC0460 GlC 13 25 20.41 -43 06 08.8           ~ 3 0
72 [BBP2008] AAT115679 GlC 13 25 20.687 -43 06 35.93 21.93 21.49 20.44 19.80 19.15 ~ 8 0
73 [VHH81] 143 GlC 13 25 23.20 -43 03 12.9           ~ 6 0
74 [WHB2007] GC0461 GlC 13 25 23.97 -43 03 45.2           ~ 2 0
75 [WHH2005] 14 GlC 13 25 25.4852520922 -42 56 31.247651540 20.99 20.83 20.06 19.56 19.05 ~ 7 0
76 [HHG2004] 108 GlC 13 25 25.7271656233 -43 05 16.616303847 20.88 20.70 19.88 19.39 18.86 ~ 13 0
77 [VHH81] 46 GlC 13 25 25.9525408438 -43 03 25.762682742 19.74 19.71 19.10 18.74 18.30 ~ 7 0
78 [WHB2007] GC0463 GlC 13 25 27.2781314840 -42 58 28.825114526           ~ 3 0
79 [WHB2007] GC0464 GlC 13 25 27.43 -42 55 30.1           ~ 3 0
80 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4087 3
81 [KKF2001] J132528.04-430402.81 GlC 13 25 27.97 -43 04 02.1 20.90 20.23 19.18 18.56 17.90 ~ 16 0
82 [WHH2005] 17 GlC 13 25 29.41 -42 57 42.7 19.68 19.39 18.57 18.06 17.48 ~ 5 0
83 [HGH92] G169 GlC 13 25 29.4126880311 -42 58 09.783904122 21.39 20.58 19.49 18.92 18.12 ~ 15 0
84 [HGH2004] 201.37341-42.91234 GlC 13 25 29.6153408825 -42 54 44.463143016 20.91 20.29 19.26 18.73 17.98 ~ 6 0
85 [WHH2005] 18 GlC 13 25 30.0721603410 -42 56 46.937867773 19.85 19.36 18.36 17.85 17.16 ~ 5 0
86 [R2001b] f2.GC-28 GlC 13 25 30.16 -43 06 54.7     21.49     ~ 8 0
87 [WHB2007] GC0466 GlC 13 25 30.33 -43 05 42.9           ~ 2 0
88 [WHB2007] GC0467 GlC 13 25 31.08 -42 58 33.5           ~ 2 0
89 [WHB2007] GC0468 GlC 13 25 31.26 -42 55 47.6           ~ 2 0
90 [BBP2008] AAT117322 GlC 13 25 31.725 -42 55 15.60 21.14 20.91 20.08 19.55 19.07 ~ 7 0
91 [WHB2007] GC0469 GlC 13 25 31.73 -42 59 57.4           ~ 1 0
92 [KKF2001] J132532.44-425849.98 GlC 13 25 32.56 -42 58 46.6 20.44 19.86 18.86 18.24 17.64 ~ 15 0
93 [R2001b] f2.GC-23 GlC 13 25 32.7820579360 -43 07 02.342413246 20.08 19.67 18.77 18.23 17.64 ~ 20 0
94 [KKF2001] J132532.80-425623.83 GlC 13 25 32.79 -42 56 24.4 19.62 19.43 18.64 18.15 17.64 ~ 9 0
95 [KKF2001] J132532.92-430429.81 GlC 13 25 32.86 -43 04 29.1 21.23 20.44 19.37 18.77 18.12 ~ 13 0
96 [WHB2007] GC0470 GlC 13 25 33.14 -42 54 52.9           ~ 2 0
97 [KKF2001] J132533.95-425859.53 GlC 13 25 34.21 -42 58 57.6 20.68 20.09 19.10 18.58 17.91 ~ 14 0
98 [VHH81] 45 GlC 13 25 34.244 -42 56 58.96 19.99 19.81 19.03 18.60 18.05 ~ 8 0
99 [VHH81] 154 Gl? 13 25 34.71 -43 03 30.2           ~ 5 0
100 [HGH2004] 201.39633-42.94587 GlC 13 25 35.1096886360 -42 56 45.228495727 19.67 19.47 18.68 18.19 17.70 ~ 8 0
101 [WHH2005] 22 GlC 13 25 35.30 -43 05 29.0     18.63     ~ 8 0
102 [KKF2001] J132535.52-425935.16 GlC 13 25 35.52 -42 59 35.2 20.76 20.18 19.17 18.68 17.94 ~ 12 0
103 [BBP2008] AAT118198 GlC 13 25 37.4565714254 -43 05 45.091686657 21.49 20.68 19.64 18.98 18.29 ~ 8 0
104 [VHH81] 17 GlC 13 25 39.7186771706 -42 55 59.137420988 18.82 18.51 17.63 17.10 16.57 ~ 19 0
105 2MASS J13253985-4305018 GlC 13 25 39.86 -43 05 01.8 18.79 18.42 17.53 16.97 16.43 ~ 23 0
106 [R2001b] f2.GC-3 GlC 13 25 40.8913084559 -43 08 16.057946219 20.66 20.56 19.84 19.36 18.88 ~ 11 0
107 [BBP2008] AAT118874 GlC 13 25 41.3458386313 -42 58 08.926953376 21.55 21.02 19.99 19.43 18.81 ~ 6 0
108 [WHB2007] GC0436 GlC 13 25 41.85 -42 58 28.0           ~ 3 0
109 [WHB2007] GC0471 GlC 13 25 42.110 -42 57 24.35           ~ 3 0
110 [HGH92] G370 GlC 13 25 42.2406782133 -42 59 16.938509313 19.61 19.29 18.39 17.86 17.32 ~ 10 0
111 [HGH2004] 201.42676-42.98402 GlC 13 25 42.4203270093 -42 59 02.599663841 20.11 19.74 18.81 18.24 17.66 ~ 7 0
112 [BBP2008] AAT119508 GlC 13 25 42.51 -43 03 41.4 21.85 21.42 20.39 19.77 19.18 ~ 10 0
113 [WHB2007] GC0472 GlC 13 25 42.98 -43 00 00.2           ~ 1 0
114 [WHB2007] GC0473 GlC 13 25 43.09 -43 00 05.2           ~ 2 0
115 [KKF2001] J132543.25-425837.26 GlC 13 25 43.36 -42 58 33.7 21.13 20.46 19.42 18.83 18.18 ~ 9 0
116 [VHH81] 19 GlC 13 25 43.40 -43 07 22.8 19.37 19.01 18.12 17.59 17.03 ~ 14 0
117 [VHH81] 35 GlC 13 25 44.16 -42 59 00.4 19.92 19.51 18.58 18.01 17.43 ~ 7 0
118 [WHB2007] GC0474 GlC 13 25 44.82 -42 58 20.5           ~ 2 0
119 [WHH2005] 23 GlC 13 25 45.9015283847 -42 57 20.182836940 19.26 19.12 18.37 17.89 17.41 ~ 6 0
120 [WHH2005] 24 GlC 13 25 45.9956524528 -42 56 53.018097012 20.64 20.43 19.63 19.12 18.62 ~ 6 0
121 [BBP2008] AAT119596 GlC 13 25 46.06 -43 08 24.5 21.19 20.69 19.70 19.10 18.51 ~ 4 0
122 [WHB2007] GC0475 GlC 13 25 46.36 -43 04 44.6           ~ 1 0
123 [KKF2001] J132546.59-425702.69 GlC 13 25 46.575 -42 57 02.95 21.47 20.89 19.87 19.28 18.63 ~ 16 0
124 [PFF2004] gc 66 GlC 13 25 47.1278721575 -43 06 08.913655331 21.21 20.82 19.92 19.37 18.80 ~ 11 0
125 [WHB2007] GC0476 GlC 13 25 47.23 -42 57 45.1           ~ 2 0
126 [HGH92] G357 GlC 13 25 47.82 -43 00 42.5 20.87 20.55 19.71 19.24 18.71 ~ 6 0
127 [WHB2007] GC0477 GlC 13 25 47.83 -42 57 32.6           ~ 1 0
128 [HGH92] G251 GlC 13 25 48.54 -42 57 41.2 20.50 19.93 18.93 18.33 17.69 ~ 7 0
129 [HGH2004] 201.45511-43.00060 G 13 25 49.33 -42 59 59.8           ~ 6 0
130 [WHH2005] 25 GlC 13 25 50.3481084379 -43 04 08.352472794 21.33 20.93 19.97 19.42 18.83 ~ 7 0
131 [HGH2004] 201.45995-42.96731 GlC 13 25 50.3874119237 -42 58 02.296540019 20.39 20.23 19.42 18.94 18.45 ~ 9 0
132 [BBP2008] AAT120355 GlC 13 25 50.45 -43 00 30.6 21.26 21.14 20.42 20.02 19.58 ~ 6 0
133 [BBP2008] AAT120515 GlC 13 25 51.284 -42 59 29.40 21.11 20.81 19.92 19.38 18.81 ~ 7 0
134 [HGH2004] 201.46468-42.99635 GlC 13 25 51.64 -42 59 44.2 20.79 20.59 19.82 19.34 18.83 ~ 6 0
135 [HGH2004] 201.46718-42.97503 GlC 13 25 52.28 -42 58 26.3 20.68 20.45 19.62 19.12 18.54 ~ 7 0
136 [HGH2004] 201.46985-42.97823 GlC 13 25 52.7653675260 -42 58 41.668721235 21.36 20.94 19.97 19.38 18.74 ~ 9 0
137 [HGH2004] 201.47281-43.06573 GlC 13 25 53.4776581636 -43 03 56.701794836 20.96 20.45 19.48 18.90 18.28 ~ 8 0
138 [VHH81] 22 GlC 13 25 53.680 -42 59 04.30 19.39 19.06 18.15 17.62 17.07 ~ 17 0
139 [BBP2008] AAT120976 GlC 13 25 54.29 -42 56 20.6 21.51 21.23 20.38 19.84 19.27 ~ 10 0
140 [KKF2001] J132554.59-425925.26 GlC 13 25 54.700 -42 59 22.30 18.92 18.29 17.22 16.62 15.95 ~ 29 0
141 [VHH81] 103 GlC 13 25 55.14 -42 59 10.7     18.88     ~ 6 0
142 [HGH92] G143 GlC 13 25 58.6658344016 -43 07 11.102166973 20.31 20.02 19.21 18.68 18.18 ~ 8 0
143 [WHB2007] GC0479 GlC 13 26 00.09 -42 59 55.5           ~ 2 0
144 [KKF2001] 220 GlC 13 26 05.440 -42 56 32.60 18.38 18.03 17.17 16.65 16.23 ~ 24 0
145 [HGH2004] 201.52664-43.01059 GlC 13 26 06.3966546772 -43 00 38.137981977 20.39 20.20 19.43 18.99 18.47 ~ 8 0
146 [HGH92] G170 GlC 13 26 06.93 -42 57 35.1 20.78 20.21 19.22 18.65 17.97 ~ 11 0
147 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 789 1
148 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 711 0
149 NAME Baade Window reg 18 03.5 -30 01           ~ 553 3
150 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 546 0
151 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 378 0
152 NGC 7192 GiG 22 06 50.178 -64 18 58.38   12.21 11.21 10.77   ~ 135 0

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2021.04.16-14:22:01

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