2006A&A...457..809S

Query : 2006A&A...457..809S

2006A&A...457..809S - Astronomy and Astrophysics, volume 457, 809-821 (2006/10-3)

Stellar populations of early-type galaxies in different environments. II. Ages and metallicities.

SANCHEZ-BLAZQUEZ P., GORGAS J., CARDIEL N. and GONZALEZ J.J.

Abstract (from CDS):

This is the second paper of a series devoted to the study of the stellar content of early-type galaxies. The goal of the series is to set constraints on the evolutionary status of these objects We use a new set of models that include an improved stellar library (MILES) to derive simple stellar population (SSP)-equivalent parameters in a sample of 98 early-type galaxies. The sample contains galaxies in the field, poor groups, and galaxies in the Virgo and Coma clusters. We find that low-density environment galaxies span a larger range in SSP age and metallicity than their counterparts in high density environments, with a tendency for lower σ galaxies to be younger. Early-type galaxies in low-density environments appear on average ∼1.5Gyr younger and more metal rich than their counterparts in high density environments. The sample of low-density environment galaxies shows an age-metallicity relation in which younger galaxies are found to be more metal rich, but only when metallicity is measured with a Fe-sensitive index. Conversely, there is no age-metallicity relation when the metallicity is measured with a Mg sensitive index. The mass-metallicity relation is only appreciable for the low-density environment galaxies when the metallicity is measured with a Mg-sensitive index, and not when the metallicity is measured with other indicators. On the contrary, this relation exists for the high-density environment galaxies independent of the indicator used to measure the metallicity. This suggests a dependence of the mass-metallicity relation on the environment of the galaxies. Our data favour a scenario in which galaxies in low density environments have suffered a more extended star formation history than the galaxies in the Coma cluster, which appear to host more homogenous stellar populations.

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Journal keyword(s): galaxies: abundances - galaxies: elliptical and lenticular, cD - Galaxy: stellar content - Galaxy: formation

Simbad objects: 95

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Number of rows : 95
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2154 2
2 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 786 2
3 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 440 3
4 NGC 584 Sy2 01 31 20.7231919800 -06 52 04.770287472 11.93 11.44 10.48     ~ 402 2
5 NGC 636 EmG 01 39 06.5293238064 -07 30 45.475975296   12.5       ~ 190 0
6 NGC 821 AG? 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 572 0
7 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 381 0
8 NGC 1700 EmG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 348 1
9 NGC 2329 AGN 07 09 08.0049393360 +48 36 55.726108020   13.7 13.99     ~ 135 3
10 NGC 2300 AG? 07 32 20.486 +85 42 31.90   12.2       ~ 335 0
11 NGC 2694 AG? 08 56 59.2596816360 +51 19 55.035258924   15.5       ~ 48 0
12 NGC 2693 GiG 08 56 59.2620417624 +51 20 50.738224092 13.45 12.84 11.88     ~ 126 1
13 NGC 2778 GiP 09 12 24.3741783168 +35 01 39.140496840   13.1       ~ 287 0
14 NGC 2832 BiC 09 19 46.853 +33 44 59.07   13.3 13.17     ~ 264 3
15 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 1013 2
16 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 775 1
17 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1463 0
18 NGC 3605 GiG 11 16 46.5896102400 +18 01 01.777666908   12.7       ~ 253 0
19 NGC 3608 LIN 11 16 58.967 +18 08 54.71   11.7       ~ 508 0
20 NGC 3641 GiG 11 21 08.8111086864 +03 11 40.530956028   14.10 13.20     ~ 107 1
21 NGC 3665 rG 11 24 43.630 +38 45 46.05 13.71 13.26 11.62     ~ 344 1
22 NGC 3818 EmG 11 41 57.3563891040 -06 09 20.459153376   13   11.78   ~ 178 0
23 IC 767 GiG 12 11 02.7290142024 +12 06 14.382907236   14.6       ~ 57 0
24 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1223 0
25 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 946 2
26 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 840 0
27 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1762 2
28 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6637 0
29 NGC 4415 GiG 12 26 40.4842511880 +08 26 08.595255480   14.2       ~ 112 0
30 NGC 4431 GiP 12 27 27.3817521552 +12 17 25.041554808 14.17 13.74 12.89     ~ 163 2
31 IC 794 GiG 12 28 08.6096744256 +12 05 35.874205512   14.07 13.44   12.39 ~ 112 1
32 NGC 4464 GiG 12 29 21.2937802368 +08 09 23.807609316   13.5       ~ 232 0
33 NGC 4467 GiG 12 29 30.2447376768 +07 59 34.273371336   15.2       ~ 179 0
34 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2092 2
35 NGC 4478 GiP 12 30 17.4160005576 +12 19 42.790577160 12.82 12.36 11.45   10.17 ~ 490 1
36 UGCA 283 GiG 12 30 31.985 +12 29 24.85   14.5       ~ 413 0
37 NGC 4489 GiG 12 30 52.2472748976 +16 45 31.866359004   13.2       ~ 252 0
38 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 995 2
39 NGC 4564 GiG 12 36 26.9869512504 +11 26 21.204472848 12.51 12.05 11.12     ~ 595 1
40 IC 3618 GiG 12 39 17.1257804112 +26 40 39.972372780   15.5       ~ 40 0
41 MCG+05-30-048 GiG 12 39 18.9012835104 +27 46 24.663003852   15.3       ~ 42 0
42 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1396 3
43 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 693 0
44 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1117 1
45 NGC 4673 GiG 12 45 34.6697689368 +27 03 38.999971728   13.7       ~ 83 0
46 NGC 4692 GiG 12 47 55.3116821448 +27 13 20.444822832   14.0       ~ 67 0
47 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 859 0
48 MCG+05-30-094 EmG 12 49 42.2824118760 +26 53 31.218447156   14.9       ~ 53 0
49 MCG+05-30-101 GiG 12 50 54.0392305128 +27 50 30.469067772   14.8       ~ 54 0
50 NGC 4742 GiG 12 51 48.0416784480 -10 27 17.196625800   12   11.55   ~ 225 1
51 IC 832 LIN 12 53 59.1049409712 +26 26 38.493325104   15.0       ~ 55 0
52 LEDA 83685 GiC 12 57 22.9237474704 +27 29 34.788416604   15.3       ~ 32 0
53 NGC 4839 rG 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 466 3
54 NGC 4842 G 12 57 35.8534614792 +27 29 35.689996896   14.9       ~ 84 0
55 MCG+05-31-031 LIN 12 57 36.1334483592 +27 29 05.381539332   16.30       ~ 53 1
56 IC 3957 GiC 12 59 07.5004634112 +27 46 04.045220580 16.15 15.862 14.72 14.332 13.683 ~ 112 0
57 IC 3959 GiG 12 59 08.2121809416 +27 47 02.945321736 15.56 15.2 14.03 13.771 13.064 ~ 140 0
58 NGC 4864 GiG 12 59 13.129 +27 58 36.91 15.338 14.8 13.872 13.321 12.594 ~ 134 0
59 IC 3963 GiC 12 59 13.5007965936 +27 46 28.624729584 16.11 15.837 14.72 14.33 13.71 ~ 88 0
60 NGC 4867 GiG 12 59 15.2505719952 +27 58 14.616353712 15.60 15.5 14.14 13.969 13.213 ~ 126 0
61 NGC 4865 EmG 12 59 19.8737739096 +28 05 03.488821044 15.06 14.6 13.692 13.131 12.443 ~ 112 0
62 MCG+05-31-063 G 12 59 20.5 +28 03 58 21.70 15.6 19.76     ~ 8 0
63 IC 3973 AG? 12 59 30.8230953864 +27 53 03.142254372 15.50 15.2 14.03 13.802 13.114 ~ 108 0
64 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 11.40 12.122 11.386 ~ 780 3
65 NGC 4875 GiC 12 59 37.9093929384 +27 54 26.400242232 16.03 15.92 14.57 14.322 13.605 ~ 96 0
66 LEDA 44644 G 12 59 39.6590757624 +27 57 14.115321252 16.97 16.99 15.59 15.41 14.99 ~ 73 0
67 LEDA 44651 EmG 12 59 40.2735433608 +27 58 05.677395348 17.47 17.375 16.02 15.812 15.153 ~ 61 0
68 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4796 2
69 GMP 3196 GiC 12 59 44.6993296392 +27 53 23.131781592 18.55 18.50 17.50 17.01 16.53 ~ 24 0
70 2MASX J12595140+2804232 GiC 12 59 51.409 +28 04 23.29 17.87 17.71 16.62 16.251 15.573 ~ 27 0
71 2MASX J12595760+2803543 GiC 12 59 57.607 +28 03 54.32 17.97 17.914 16.91 16.55 15.891 ~ 37 0
72 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 704 1
73 2MASX J13001702+2803502 GiC 13 00 17.0317499136 +28 03 50.085089820 16.89 16.855 15.52 15.321 14.643 ~ 68 0
74 IC 4026 EmG 13 00 22.1409893328 +28 02 49.238219148 15.99 15.5 14.63 14.202 13.553 ~ 101 0
75 LEDA 126756 G 13 00 24.822 +27 55 35.84 18.50 18.52 17.33 17.129 16.499 ~ 34 0
76 IC 4042 AGN 13 00 42.7595583480 +27 58 16.579136856 15.44 15.272 14.01 13.713 13.025 ~ 102 0
77 LEDA 44809 EmG 13 00 42.8383665048 +27 57 47.226609072 16.34 16.013 14.96 14.501 13.813 ~ 76 0
78 NGC 4908 LIN 13 00 51.5428778808 +28 02 34.346182596 15.05 14.9 13.58 13.273 12.566 ~ 121 0
79 IC 4051 EmG 13 00 54.4630403184 +28 00 27.502143300 15.04 14.8 13.50 13.003 12.305 ~ 213 0
80 NGC 5638 GiP 14 29 40.3717451400 +03 13 59.987811648 12.57 12.14 11.20     ~ 243 2
81 NGC 5796 GiP 14 59 24.115 -16 37 26.55   13   11.37   ~ 114 0
82 NGC 5812 EmG 15 00 55.708 -07 27 26.33   12   11.19   ~ 159 0
83 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 637 1
84 NGC 5831 GiG 15 04 07.0002600408 +01 13 11.705607012   13.1   11.19   ~ 294 0
85 NGC 5845 GiG 15 06 00.7823239488 +01 38 01.704838596   13.8 11.20 12.06 9.94 ~ 385 0
86 MCG+00-38-026 GiP 15 06 29.2023813744 +01 35 41.627266512   14.1 13.37 13.07 12.1 ~ 122 0
87 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 849 1
88 NGC 6125 AG? 16 19 11.5344941208 +57 59 02.863041504   13.0       ~ 101 0
89 NGC 6166 Sy2 16 28 38.24470063 +39 33 04.2335319   12.78 11.78     ~ 763 5
90 NGC 6411 AG? 17 35 32.8446342384 +60 48 48.236693796   13.2       ~ 113 0
91 NGC 6482 GiG 17 51 48.8339247888 +23 04 18.889271112 12.71 12.35 11.45     ~ 208 1
92 NGC 6577 GiG 18 12 01.2250 +21 27 48.480   14.7       ~ 29 0
93 NGC 6702 AG? 18 46 57.5835209136 +45 42 20.305242180 15.30 14.73 13.05     ~ 142 0
94 NGC 6703 AG? 18 47 18.8166660360 +45 33 02.274865812   12.29 11.34     ~ 217 0
95 NGC 7052 rG 21 18 33.0441963648 +26 26 49.174586196 15.52 14.85 13.09     ~ 323 1

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