2009MNRAS.392..982C

Query : 2009MNRAS.392..982C

2009MNRAS.392..982C - Mon. Not. R. Astron. Soc., 392, 982-991 (2009/January-3)

The mid-infrared colour-magnitude relation of early-type galaxies in the Coma cluster as measured by Spitzer-IRS.

CLEMENS M.S., BRESSAN A., PANUZZO P., RAMPAZZO R., SILVA L., BUSON L. and GRANATO G.L.

Abstract (from CDS):

We use 16µm, Spitzer-Infrared Spectrograph, blue peak-up photometry of 50 early-type galaxies in the Coma cluster to define the mid-infrared colour-magnitude relation. We compare with recent simple stellar population models that include the mid-infrared emission from the extended, dusty envelopes of evolved stars. The Ks-[16] colour in these models is very sensitive to the relative population of dusty asymptotic giant branch stars. We find that the passively evolving early-type galaxies define a sequence of approximately constant age (∼10 Gyr) with varying metallicity. Several galaxies that lie on the optical/near-infrared colour-magnitude relation do not lie on the mid-infrared relation. This illustrates the sensitivity of the Ks-[16] colour to age. The fact that a colour-magnitude relation is seen in the mid-infrared underlines the extremely passive nature of the majority (68 per cent) of early-type galaxies in the Coma cluster. The corollary of this is that 32 per cent of the early-type galaxies in our sample are not `passive', insofar as they are either significantly younger than 10 Gyr or they have had some rejuvenation episode within the last few Gyr.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular cD - galaxies: evolution - galaxies: photometry

Simbad objects: 52

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Number of rows : 52
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 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 474 2
5 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
6 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
7 M 60 GiC 12 43 39.9708251934 +11 33 09.688174067   10.3       ~ 1395 1
8 NGC 4839 BiC 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 482 3
9 NGC 4841 LIN 12 57 31.978 +28 28 36.86   13.5       ~ 154 0
10 2MASX J12575059+2752454 GiG 12 57 50.6358338592 +27 52 46.172236800   15.3 15.13 14.88   ~ 38 0
11 IC 3946 AG? 12 58 48.7288667760 +27 48 37.586925792 15.33 15.3 13.85 13.821 13.094 ~ 77 0
12 2MASX J12585523+2757529 GiC 12 58 55.2555720768 +27 57 52.976652984 16.78 16.505 15.39 15.01 14.264 ~ 82 0
13 2MASX J12590006+2758029 GiC 12 59 00.0748454616 +27 58 02.956799568 17.27 17.216 15.80 15.55 15.032 ~ 73 0
14 NGC 4860 GiG 12 59 03.9057463440 +28 07 25.326557148 14.84 14.7 13.24     ~ 157 0
15 IC 3955 GiC 12 59 06.0295581048 +27 59 48.152325300 15.78 15.591 14.31 14.011 13.323 ~ 98 0
16 IC 3957 GiC 12 59 07.5004634112 +27 46 04.045220580 16.15 15.862 14.72 14.332 13.683 ~ 113 0
17 IC 3959 GiG 12 59 08.2121809416 +27 47 02.945321736 15.56 15.2 14.03 13.771 13.064 ~ 143 0
18 IC 3963 GiC 12 59 13.5007965936 +27 46 28.624729584 16.11 15.837 14.72 14.33 13.71 ~ 91 0
19 NGC 4867 GiG 12 59 15.2505719952 +27 58 14.616353712 15.60 15.5 14.14 13.969 13.213 ~ 129 0
20 2MASX J12592491+2744198 LSB 12 59 24.9342998952 +27 44 19.850059932 16.65 16.403 15.23 14.872 14.213 ~ 69 0
21 2MASX J12592529+2758048 GiC 12 59 25.3302921888 +27 58 04.567089792 16.97 17.055 15.59 15.541 14.863 ~ 67 0
22 IC 3968 EmG 12 59 25.4893671192 +27 58 23.553468660 16.70 16.795 15.32 15.271 14.593 ~ 63 0
23 2MASX J12593064+2747288 GiC 12 59 30.6487772544 +27 47 29.144981328 17.10 17.083 15.84 15.6 14.942 ~ 65 0
24 IC 3973 AG? 12 59 30.8230953864 +27 53 03.142254372 15.50 15.2 14.03 13.802 13.114 ~ 112 0
25 NGC 4873 EmG 12 59 32.7956813376 +27 59 01.023698256 15.53 15.4 14.36 14.24 13.224 ~ 125 0
26 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 12.71 12.27 11.386 ~ 814 3
27 NGC 4875 GiC 12 59 37.9093929384 +27 54 26.400242232 16.03 15.92 14.57 14.322 13.605 ~ 99 0
28 Z 160-233 G 12 59 42.3031814928 +27 55 29.073263772 17.64 16.553 15.42 15.051 14.373 ~ 99 0
29 NGC 4876 LIN 12 59 44.4043327032 +27 54 44.883805032 15.61 15.1 14.18 13.992 13.333 ~ 154 0
30 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
31 IC 3998 G 12 59 46.7810952336 +27 58 25.887811872 16.07 15.909 14.61 14.341 13.605 ~ 97 0
32 2MASX J12595511+2807422 GiC 12 59 55.0983190896 +28 07 42.060679572 16.70 15 15.33     ~ 86 0
33 NGC 4883 GiG 12 59 56.0172515304 +28 02 04.976091780 15.76 15.2 14.27 13.872 13.165 ~ 110 0
34 NGC 4881 LIN 12 59 57.7481819280 +28 14 48.009858036 15.03 14.7 13.56     ~ 190 0
35 Z 160-240 GiC 13 00 05.5056701616 +27 48 27.404305740 16.611 16.195 15.233 14.622 13.964 ~ 56 0
36 IC 4011 G 13 00 06.3940488048 +28 00 14.849196120 16.37 16.207 15.05 14.661 14.002 ~ 120 0
37 IC 4012 G 13 00 07.9959855216 +28 04 42.812545800 16.09 15.948 14.64 14.362 13.655 ~ 124 0
38 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 742 1
39 NGC 4895A EmG 13 00 09.1231203816 +28 10 13.436530176 16.33 15.6 14.94     ~ 98 0
40 IC 4021 LIN 13 00 14.7492904032 +28 02 28.679693064 16.12 15.974 14.75 14.451 13.783 ~ 125 0
41 IC 4026 EmG 13 00 22.1409893328 +28 02 49.238219148 15.99 15.5 14.63 14.202 13.553 ~ 104 0
42 NGC 4906 G 13 00 39.7603737720 +27 55 26.243500044 15.50 15.2 14.08 13.822 13.144 ~ 136 0
43 IC 4041 EmG 13 00 40.8541511496 +27 59 47.807863512 16.19 15.88 14.77 14.343 13.733 ~ 107 0
44 IC 4042 AGN 13 00 42.7595583480 +27 58 16.579136856 15.44 15.272 14.01 13.713 13.025 ~ 105 0
45 IC 4045 AGN 13 00 48.6521997192 +28 05 26.675160468 15.25 15.1 13.77 13.573 12.895 ~ 153 0
46 NGC 4908 LIN 13 00 51.5428778808 +28 02 34.346182596 15.05 14.9 13.58 13.273 12.566 ~ 125 0
47 IC 4051 EmG 13 00 54.4630403184 +28 00 27.502143300 15.04 14.8 13.50 13.003 12.305 ~ 218 0
48 NGC 4919 GiG 13 01 17.5966333536 +27 48 32.765879124   14.9       ~ 88 0
49 GMP 2008 G 13 01 31.0 +28 15 42           ~ 3 0
50 NGC 4923 EmG 13 01 31.7992415376 +27 50 51.100173564   14.7       ~ 114 0
51 NGC 4926 LIN 13 01 53.7302453520 +27 37 28.027389360   14.1       ~ 159 0
52 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0

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