1999MNRAS.306..607J

Query : 1999MNRAS.306..607J

1999MNRAS.306..607J - Mon. Not. R. Astron. Soc., 306, 607-636 (1999/July-1)

E and SO galaxies in the central part of the Coma cluster: ages, metal abundances and dark matter.

JORGENSEN I.

Abstract (from CDS):

Mean ages and metal abundances are estimated for the stellar populations in a sample of 115 E and S0 galaxies in the central 64 arcminx70 arcmin of the Coma cluster. The estimates are based on the absorption line indices Mg2, <Fe> and HβG, and the mass-to-light ratios (M/L). Single stellar population models from Vazdekis et al. were used to transform from the measured line indices and M/L ratios to mean ages and mean metal abundances ([Mg/H] and [Fe/H]). The non-solar abundance ratios [Mg/Fe] were taken into account by assuming that for a given age and iron abundance, a [Mg/Fe] different from solar will affect the Mg2 index but not the M/L ratio or the <Fe> and HβG indices. The derived ages and abundances are the luminosity-weighted mean values for the stellar populations in the galaxies.

By comparing the mean ages derived from the Mg2-HβG diagram with those derived from the Mg2-M/L diagram, we estimate the variations of the fraction of dark matter. Alternatively, the difference between the two estimates of the mean age may be caused by variations in the initial mass function or any non-homology of the galaxies.

The distributions of the derived mean ages and abundances show that there are real variations in both the mean ages and the abundances. We find an intrinsic rms scatter of [Mg/H], [Fe/H] and [Mg/Fe] of 0.2 dex, and an intrinsic rms scatter of the derived ages of 0.17 dex. The magnesium abundances [Mg/H] and the abundance ratios [Mg/Fe] are both strongly correlated with the central velocity dispersions of the galaxies, while the iron abundances [Fe/H] are uncorrelated with the velocity dispersions. Further, [Mg/H] and [Fe/H] are strongly anticorrelated with the mean ages of the galaxies. This is not the case for [Mg/Fe].

We have tested whether the slopes of the scaling relations between the global parameters for the galaxies (the Mg2-σ relation, the <Fe>-σ relation, the HβG-σ relation and the Fundamental Plane) are consistent with the relation between the ages, the abundances and the velocity dispersions. We find that all the slopes, except the slope of the Fundamental Plane, can be explained in a consistent way as resulting from a combination between variations of the mean ages and the mean abundances as functions of the velocity dispersions. The slope of the Fundamental Plane is `steeper' than predicted from the variations in the ages and abundances.

Because of the correlation between the mean ages and the mean abundances, substantial variations in the ages and the abundances are possible while maintaining a low scatter of all the scaling relations. When this correlation is taken into account, the observed scatter of the scaling relations is consistent with the rms scatter in the derived ages and abundances at a given velocity dispersion.


Abstract Copyright: 1999 RAS

Journal keyword(s): galaxies: clusters: individual: Coma - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: stellar content - dark matter

Simbad objects: 129

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Number of rows : 129
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 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
2 NGC 2320 GiG 07 05 42.0152480592 +50 34 51.563046000   13.9       ~ 107 0
3 NGC 2513 GiG 08 02 24.657 +09 24 48.93   13.7       ~ 96 0
4 NGC 2778 GiP 09 12 24.3741783168 +35 01 39.140496840   13.1       ~ 303 0
5 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 463 0
6 NGC 3156 GiG 10 12 41.2457368824 +03 07 45.701284764   12.8       ~ 241 0
7 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 798 1
8 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1504 0
9 NGC 3605 GiG 11 16 46.5896102400 +18 01 01.777666908   12.7       ~ 261 0
10 NGC 3640 GiG 11 21 06.852 +03 14 05.15 11.89 11.36 10.44     ~ 291 3
11 NGC 4526 GiC 12 34 03.02853 +07 41 56.9040   10.6       ~ 707 0
12 Z 160-37 GiG 12 57 09.4184229096 +27 27 59.137216200   15.0       ~ 84 0
13 NGC 4839 BiC 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 482 3
14 Mrk 55 LIN 12 57 25.2481557048 +27 24 16.550025768   16.0       ~ 78 0
15 Z 160-40 LIN 12 57 25.8391398984 +27 32 46.177668564   15.3       ~ 53 0
16 2MASX J12572841+2810348 GiG 12 57 28.4287591296 +28 10 35.073422760   15.4 14.58 14.34   ~ 40 0
17 NGC 4841 LIN 12 57 31.978 +28 28 36.86   13.5       ~ 154 0
18 NGC 4840 LIN 12 57 32.8380921120 +27 36 37.243946592   14.8       ~ 115 0
19 NGC 4841B LIN 12 57 33.8858810016 +28 28 56.223469956   13.5       ~ 90 0
20 NGC 4842A LIN 12 57 35.8534614792 +27 29 35.689996896   14.9       ~ 87 0
21 NGC 4842B LIN 12 57 36.1334483592 +27 29 05.381539332   16.30 15.46 15.15   ~ 57 1
22 LEDA 83695 GiC 12 57 46.1623966512 +27 45 25.345511748   15 14.63 14.43   ~ 49 0
23 Z 160-47 GiC 12 57 47.3031669648 +27 49 59.931576084   15.7 14.97 14.96   ~ 52 0
24 Z 160-48 GiG 12 57 48.0666718104 +27 52 59.033603712   15.3       ~ 56 0
25 Z 160-49 GiG 12 57 48.6632127528 +28 10 49.480506876   15.5       ~ 78 0
26 2MASX J12575059+2752454 GiG 12 57 50.6358338592 +27 52 46.172236800   15.3 15.13 14.88   ~ 38 0
27 2MASX J12575392+2829594 GiC 12 57 53.9421825408 +28 29 59.362304424   15       ~ 46 0
28 Z 160-53 GiC 12 58 03.5122020960 +27 48 53.716276944   15.7 15.20 14.96   ~ 44 0
29 2MASX J12581382+2810576 GiC 12 58 13.8063924984 +28 10 57.169052400 16.38 15 15.06 14.75   ~ 44 0
30 Z 160-57 GiG 12 58 15.0479321328 +28 07 33.211764840 15.98 15.5 14.56     ~ 39 0
31 NGC 4851 GiG 12 58 21.7112672880 +28 08 55.482369216 15.87 15.2 14.49     ~ 56 0
32 NGC 4850 AGN 12 58 21.8338490568 +27 58 04.024808724 15.43 15.3 14.03     ~ 101 0
33 NGC 4851N GiG 12 58 22.1618225520 +28 09 07.650507456 16.24 15.2 15.28 15.02   ~ 40 0
34 Z 160-65 GiG 12 58 30.2081987472 +28 00 53.079578820 15.30 15.0 13.88     ~ 96 0
35 LEDA 83720 G 12 58 32.0712633312 +27 27 22.860678816   15     14.42 ~ 40 0
36 NGC 4853 rG 12 58 35.1979266912 +27 35 46.930900632 13.96 14.68 13.00 13.24   ~ 156 1
37 IC 3943 LIN 12 58 36.3535295664 +28 06 49.471215084 15.63 15.6 14.13     ~ 60 0
38 NGC 4854 GiG 12 58 47.4113103480 +27 40 29.084942676 15.66 15.2 13.83 13.48   ~ 104 0
39 IC 3946 AG? 12 58 48.7288667760 +27 48 37.586925792 15.33 15.3 13.85 13.821 13.094 ~ 77 0
40 2MASX J12585077+2805019 GiC 12 58 50.7702779928 +28 05 02.470669440 16.69 16.778 15.34 15.269 14.601 ~ 54 0
41 IC 3947 AG? 12 58 52.1045260536 +27 47 06.266103540 16.00 15.866 14.61 14.341 13.633 ~ 93 0
42 2MASX J12585523+2757529 GiC 12 58 55.2555720768 +27 57 52.976652984 16.78 16.505 15.39 15.01 14.264 ~ 82 0
43 LEDA 83729 AG? 12 58 58.1124057696 +27 35 41.015350536 16.42 15 15.02     ~ 52 0
44 2MASX J12590006+2758029 GiC 12 59 00.0748454616 +27 58 02.956799568 17.27 17.216 15.80 15.55 15.032 ~ 73 0
45 Z 160-214 AGN 12 59 01.8109774776 +28 13 31.188539316 15.48 15.3 14.01     ~ 63 0
46 NGC 4860 GiG 12 59 03.9057463440 +28 07 25.326557148 14.84 14.7 13.24     ~ 157 0
47 2MASX J12590459+2754389 GiC 12 59 04.6397847984 +27 54 39.532051296 16.84 16.836 15.46 15.34 14.652 ~ 60 0
48 IC 3955 GiC 12 59 06.0295581048 +27 59 48.152325300 15.78 15.591 14.31 14.011 13.323 ~ 98 0
49 IC 3957 GiC 12 59 07.5004634112 +27 46 04.045220580 16.15 15.862 14.72 14.332 13.683 ~ 113 0
50 IC 3960 AGN 12 59 07.9458606024 +27 51 17.892495432 15.96 15.5 14.47 14.233 13.516 ~ 103 1
51 IC 3959 GiG 12 59 08.2121809416 +27 47 02.945321736 15.56 15.2 14.03 13.771 13.064 ~ 143 0
52 NGC 4864 GiG 12 59 13.129 +27 58 36.91 15.338 14.8 13.872 13.321 12.594 ~ 136 0
53 IC 3963 GiC 12 59 13.5007965936 +27 46 28.624729584 16.11 15.837 14.72 14.33 13.71 ~ 91 0
54 Z 160-74 LIN 12 59 13.7080797336 +27 24 09.261692784   15.4       ~ 71 0
55 Z 160-A14 GiC 12 59 13.9260998280 +28 04 34.492645668 16.20 15.731 14.89 14.484 13.602 ~ 57 0
56 NGC 4867 GiG 12 59 15.2505719952 +27 58 14.616353712 15.60 15.5 14.14 13.969 13.213 ~ 129 0
57 NGC 4865 EmG 12 59 19.8737739096 +28 05 03.488821044 15.06 14.6 13.692 13.131 12.443 ~ 115 0
58 2MASX J12592016+2753098 GiC 12 59 20.1719431200 +27 53 09.554536464 16.59 16.657 15.38 15.07 14.591 ~ 89 0
59 2MASX J12592265+2753488 GiC 12 59 22.6199737728 +27 53 48.734841408 16.66 16.504 15.33 14.972 14.39 ~ 67 0
60 NGC 4869 EmG 12 59 23.3588349024 +27 54 41.731884360 15.03 14.9 13.52 13.292 12.536 ~ 286 0
61 2MASX J12592491+2744198 LSB 12 59 24.9342998952 +27 44 19.850059932 16.65 16.403 15.23 14.872 14.213 ~ 69 0
62 2MASX J12592529+2758048 GiC 12 59 25.3302921888 +27 58 04.567089792 16.97 17.055 15.59 15.541 14.863 ~ 67 0
63 IC 3968 EmG 12 59 25.4893671192 +27 58 23.553468660 16.70 16.795 15.32 15.271 14.593 ~ 63 0
64 LEDA 44594 EmG 12 59 26.5981818744 +27 59 54.533097708 17.532 17.181 15.87 15.52 15.052 ~ 76 0
65 LEDA 44602 AG? 12 59 28.7291561256 +28 02 25.896174396 17.389 16.995 16.033 15.471 14.803 ~ 54 0
66 IC 3976 G 12 59 29.4017977320 +27 51 00.507145788 15.93 15.5 14.42 14.212 13.495 ~ 111 0
67 NGC 4871 LIN 12 59 29.9631023208 +27 57 23.169658968 15.59 15.1 14.07 13.801 13.113 ~ 121 0
68 2MASX J12593064+2747288 GiC 12 59 30.6487772544 +27 47 29.144981328 17.10 17.083 15.84 15.6 14.942 ~ 65 0
69 IC 3973 AG? 12 59 30.8230953864 +27 53 03.142254372 15.50 15.2 14.03 13.802 13.114 ~ 112 0
70 LEDA 44616 EmG 12 59 31.4454616392 +28 02 47.777266752 16.664 15.931 15.014 14.412 13.647 ~ 67 0
71 NGC 4873 EmG 12 59 32.7956813376 +27 59 01.023698256 15.53 15.4 14.36 14.24 13.224 ~ 125 0
72 NGC 4872 AGN 12 59 34.1212116072 +27 56 48.678716616 15.58 14.7 14.10 14.092 13.423 ~ 141 0
73 2MASX J12593568+2833047 GiC 12 59 35.6736756816 +28 33 04.950930096   16 15.09 15.17   ~ 32 0
74 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 12.71 12.27 11.386 ~ 814 3
75 NGC 4875 GiC 12 59 37.9093929384 +27 54 26.400242232 16.03 15.92 14.57 14.322 13.605 ~ 99 0
76 LEDA 44644 G 12 59 39.6590757624 +27 57 14.115321252 16.97 16.99 15.59 15.41 14.99 ~ 75 0
77 Z 160-233 G 12 59 42.3031814928 +27 55 29.073263772 17.64 16.553 15.42 15.051 14.373 ~ 99 0
78 LEDA 44656 G 12 59 43.7289109656 +27 59 40.858551456 16.53 16.384 15.15 14.832 14.154 ~ 96 0
79 NGC 4876 LIN 12 59 44.4043327032 +27 54 44.883805032 15.61 15.1 14.18 13.992 13.333 ~ 154 0
80 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
81 Z 160-235 GiC 12 59 46.1220417624 +27 51 26.046219456 16.37 16.258 15.00 14.701 13.994 ~ 66 0
82 IC 3998 G 12 59 46.7810952336 +27 58 25.887811872 16.07 15.909 14.61 14.341 13.605 ~ 97 0
83 Z 160-79 EmG 12 59 47.1522973224 +27 42 37.061804484   15.1       ~ 74 0
84 2MASX J12595511+2807422 GiC 12 59 55.0983190896 +28 07 42.060679572 16.70 15 15.33     ~ 86 0
85 NGC 4883 GiG 12 59 56.0172515304 +28 02 04.976091780 15.76 15.2 14.27 13.872 13.165 ~ 110 0
86 2MASX J12595670+2755483 GiC 12 59 56.6529405408 +27 55 48.133297416 16.72 16.765 15.32 14.88 14.592 ~ 71 0
87 NGC 4881 LIN 12 59 57.7481819280 +28 14 48.009858036 15.03 14.7 13.56     ~ 190 0
88 NGC 4886 EmG 13 00 04.4494334064 +27 59 15.306472032 15.595 15.1 14.294 13.712 13.092 ~ 134 0
89 Z 160-240 GiC 13 00 05.5056701616 +27 48 27.404305740 16.611 16.195 15.233 14.622 13.964 ~ 56 0
90 LEDA 44704 AG? 13 00 06.2918094240 +27 46 32.785530024 16.51 16.154 15.09 14.631 13.973 ~ 69 0
91 IC 4011 G 13 00 06.3940488048 +28 00 14.849196120 16.37 16.207 15.05 14.661 14.002 ~ 120 0
92 IC 4012 G 13 00 07.9959855216 +28 04 42.812545800 16.09 15.948 14.64 14.362 13.655 ~ 124 0
93 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 742 1
94 NGC 4895A EmG 13 00 09.1231203816 +28 10 13.436530176 16.33 15.6 14.94     ~ 98 0
95 LEDA 44723 G 13 00 12.8704082496 +28 04 31.779305976 16.53 16.272 15.17 14.742 14.122 ~ 81 0
96 IC 4021 LIN 13 00 14.7492904032 +28 02 28.679693064 16.12 15.974 14.75 14.451 13.783 ~ 125 0
97 NGC 4894 AG? 13 00 16.5193713624 +27 58 03.082120068 16.28 16.106 15.04 14.71 14.051 ~ 77 0
98 NGC 4898A GiC 13 00 17.6793071808 +27 57 18.945906156 15.252 15.0 13.862 13.32 12.574 ~ 59 0
99 NGC 4895 LIN 13 00 17.9283615768 +28 12 08.593323732 14.57 14.3 13.09     ~ 110 0
100 NGC 4898B GiC 13 00 18.0983806416 +27 57 23.732971884 15.7 15.284 14.333 13.771 13.093 ~ 47 0
101 LEDA 83746 GiC 13 00 19.1059455024 +27 33 13.409044308   14       ~ 44 0
102 IC 4026 EmG 13 00 22.1409893328 +28 02 49.238219148 15.99 15.5 14.63 14.202 13.553 ~ 104 0
103 2MASX J13002689+2730556 GiC 13 00 26.8586825136 +27 30 56.170117944   15       ~ 52 0
104 IC 4030 G 13 00 27.9700441440 +27 57 21.580940088 16.65 16.50 15.27 14.91 14.49 ~ 77 0
105 IC 4033 EmG 13 00 28.3941057864 +27 58 20.692734312 16.57 16.741 15.23 15.203 14.593 ~ 61 0
106 NGC 4896 LIN 13 00 30.7683020616 +28 20 46.935237984   15.1       ~ 86 0
107 Z 160-251 GiC 13 00 35.5780988616 +28 08 46.059465768   15.7       ~ 58 0
108 LEDA 44792 G 13 00 38.7668539488 +28 00 52.318973772 16.058 15.75 14.844 14.291 13.69 ~ 68 0
109 NGC 4906 G 13 00 39.7603737720 +27 55 26.243500044 15.50 15.2 14.08 13.822 13.144 ~ 136 0
110 IC 4041 EmG 13 00 40.8541511496 +27 59 47.807863512 16.19 15.88 14.77 14.343 13.733 ~ 107 0
111 IC 4042 AGN 13 00 42.7595583480 +27 58 16.579136856 15.44 15.272 14.01 13.713 13.025 ~ 105 0
112 LEDA 44809 EmG 13 00 42.8383665048 +27 57 47.226609072 16.34 16.013 14.96 14.501 13.813 ~ 80 0
113 Z 160-89 GiC 13 00 44.2313132568 +28 20 14.181833076 15.84 15.6 14.53     ~ 56 0
114 LEDA 44815 AG? 13 00 44.6404235112 +28 06 02.280300408 16.90 15 15.59   14.89 ~ 66 0
115 IC 4045 AGN 13 00 48.6521997192 +28 05 26.675160468 15.25 15.1 13.77 13.573 12.895 ~ 153 0
116 NGC 4908 LIN 13 00 51.5428778808 +28 02 34.346182596 15.05 14.9 13.58 13.273 12.566 ~ 125 0
117 Z 160-91 LIN 13 00 52.0847397072 +28 21 58.080590892 14.99 14.9 13.56     ~ 77 0
118 NGC 4911A GiC 13 00 54.1209718584 +27 47 01.431920688 16.46 16.61 15.27 15.05 14.65 ~ 39 0
119 IC 4051 EmG 13 00 54.4630403184 +28 00 27.502143300 15.04 14.8 13.50 13.003 12.305 ~ 218 0
120 Z 160-261 EmG 13 00 59.2582319952 +27 53 59.450406900 15.99 15.6 14.61     ~ 65 0
121 2MASX J13010904+2821352 GiC 13 01 09.0369481320 +28 21 35.227685088 16.51 16 15.29     ~ 33 0
122 Z 160-92 EmG 13 01 09.2357211984 +27 49 05.993484708 16.48 15.7 15.22     ~ 73 0
123 Z 160-93 GiC 13 01 10.7071274040 +27 48 10.476009756 16.51 15.7 15.18     ~ 47 0
124 NGC 4919 GiG 13 01 17.5966333536 +27 48 32.765879124   14.9       ~ 88 0
125 2MASX J13012280+2811456 GiC 13 01 22.7807820912 +28 11 45.754464732   15       ~ 51 0
126 NGC 4923 EmG 13 01 31.7992415376 +27 50 51.100173564   14.7       ~ 114 0
127 Z 160-101 LIN 13 01 47.0185231920 +28 05 41.988686424   15.2       ~ 65 0
128 NGC 4926 LIN 13 01 53.7302453520 +27 37 28.027389360   14.1       ~ 159 0
129 NGC 5846 rG 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 891 2

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