2012MNRAS.421.2982S

Query : 2012MNRAS.421.2982S

2012MNRAS.421.2982S - Mon. Not. R. Astron. Soc., 421, 2982-2997 (2012/April-3)

What drives the ultraviolet colours of passive galaxies?

SMITH R.J., LUCEY J.R. and CARTER D.

Abstract (from CDS):

We present and analyse optical and ultraviolet (UV) colours for passive and optically-red Coma cluster galaxies for which we have spectroscopic age and element abundance estimates. Our sample of 150 objects covers a wide range in mass, from giant ellipticals down to the bright end of the dwarf-galaxy regime. Galaxies with ongoing star formation have been removed using strict Hα emission-line criteria. We focus on the colours FUV-i, NUV-i, FUV-NUV, u*-g and g-i. We find that all of these colours are correlated with both luminosity and velocity dispersion at the >5σ level, with FUV-i and FUV-NUV becoming bluer with increasing `mass' while the other colours become redder. We perform a purely empirical analysis to assess what fraction of the variation in each colour can be accounted for by variations in the average stellar populations, as traced by the optical spectra. For the optical colours, u*-g and g-i, most of the observed scatter ( ∼ 80 per cent after allowing for measurement errors and for systematic errors in u*-g) is attributable to stellar population variations, with colours becoming redder with increasing age and metallicity (Mg/H). The FUV-i colour becomes bluer with increasing age and with increasing Mg/H, favouring the `metal-rich single-star' origin for the UV upturn. However, correlations with the optically-dominant stellar populations account for only about half of the large observed scatter. We propose that the excess scatter in FUV-i may be due to a varying proportion of ancient stars in galaxies with younger [simple stellar population (SSP) equivalent] average ages. The NUV-i colour is sensitive to SSP-equivalent age and Mg/H (in the same sense as optical colours), but also exhibits excess scatter that can be attributed to `leakage' of the far-UV-dominant (FUV-dominant) old hot population. After applying a correction based on the FUV-i colour, the much of the remaining variance in NUV-i is attributable to variations in the spectroscopic parameters, similar to the results for optical colours. Finally, the FUV-NUV colour is surprisingly well behaved, showing strong correlations with age and metallicity, and little residual scatter. Interpreting this colour is complicated, however, since it mixes the effects of the main-sequence turn-off, in the near-UV, with the variation in the hot post-red giant branch content dominating the FUV.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: stellar content - ultraviolet: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/421/2982): table1.dat table2.dat>

Simbad objects: 153

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Number of rows : 153
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 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
2 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
3 NGC 4787 GiC 12 54 05.5164031392 +27 04 07.045997916   15.44       ~ 51 1
4 2MASX J12540994+2805331 GiC 12 54 09.9836301576 +28 05 32.944002936   15.28       ~ 25 0
5 NGC 4788 EmG 12 54 16.0201864032 +27 18 13.522244292   15.4       ~ 39 0
6 2MASX J12542229+2705031 GiC 12 54 22.2780391152 +27 05 03.063646860           ~ 16 0
7 Z 159-114 GiC 12 54 32.9576294328 +28 22 36.366107376   15.5       ~ 39 0
8 Z 159-115 GiC 12 54 36.8117666064 +26 56 05.496163728   15.6       ~ 21 0
9 Z 160-18 EmG 12 55 27.7985656416 +27 39 22.115656548   15.3       ~ 43 0
10 NGC 4807 GiP 12 55 29.1008459472 +27 31 17.156306460   14.50 13.50     ~ 105 1
11 IC 3900 LIN 12 55 41.2970309376 +27 15 02.778023088   14.8       ~ 74 0
12 2MASX J12560174+2645235 GiC 12 56 01.7502476640 +26 45 23.848700292           ~ 18 0
13 2MASX J12560642+2738530 GiG 12 56 06.4472014488 +27 38 52.998524268   15.5 15.79 15.63   ~ 20 0
14 2MASX J12560986+2750390 GiC 12 56 09.8988284448 +27 50 39.342542172     14.86 14.63   ~ 26 0
15 2MASX J12561667+2726450 GiC 12 56 16.6917440568 +27 26 45.572924328   16.60   14.89   ~ 23 0
16 Z 160-23 GiG 12 56 19.7946494520 +27 45 03.791146356   15.5       ~ 61 0
17 Z 160-27 GiC 12 56 26.6281275576 +27 49 50.374988076   15.6       ~ 53 0
18 NGC 4821 GiG 12 56 29.1259535040 +26 57 25.188745176   15.0       ~ 51 0
19 NGC 4817 GiC 12 56 29.8118142816 +27 56 23.999503596   15       ~ 47 0
20 LEDA 94037 GiC 12 56 32.0394242160 +27 03 20.111554476   16.18   14.81   ~ 31 0
21 NGC 4824 LIN 12 56 34.1917941432 +27 32 20.298306732   15       ~ 61 0
22 2MASX J12563516+2816318 GiC 12 56 35.1932162520 +28 16 31.657907568   16       ~ 29 0
23 NGC 4828 LIN 12 56 42.8599834536 +28 01 13.652062284   15.4       ~ 51 0
24 2MASX J12564353+2702048 GiC 12 56 43.5172607952 +27 02 05.121789720   16.01 15.92 15.67   ~ 33 0
25 NGC 4827 LIN 12 56 43.5187101000 +27 10 43.654438128   13.90 12.91     ~ 125 1
26 2MASX J12564777+2725158 EmG 12 56 47.7779696160 +27 25 15.645102888   17.04 15.87 15.57   ~ 39 0
27 2MASX J12565310+2755458 GiC 12 56 53.1387298824 +27 55 46.217339616   15       ~ 26 0
28 2MASX J12565652+2837238 EmG 12 56 56.5784702520 +28 37 24.133632204   15       ~ 39 0
29 Z 160-35 GiG 12 57 01.6209977232 +29 03 45.368318556   15.4 14.59     ~ 35 0
30 2MASX J12570166+2722198 GiC 12 57 01.6984964064 +27 22 19.473476772   16.70   15.18   ~ 25 0
31 Z 160-37 GiG 12 57 09.4184229096 +27 27 59.137216200   15.0       ~ 84 0
32 2MASX J12571682+2737068 LIN 12 57 16.7880908496 +27 37 06.459575664   15       ~ 32 0
33 NGC 4839 BiC 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 482 3
34 Z 160-40 LIN 12 57 25.8391398984 +27 32 46.177668564   15.3       ~ 53 0
35 NGC 4841 LIN 12 57 31.978 +28 28 36.86   13.5       ~ 154 0
36 NGC 4840 LIN 12 57 32.8380921120 +27 36 37.243946592   14.8       ~ 115 0
37 NGC 4842B LIN 12 57 36.1334483592 +27 29 05.381539332   16.30 15.46 15.15   ~ 57 1
38 Z 160-47 GiC 12 57 47.3031669648 +27 49 59.931576084   15.7 14.97 14.96   ~ 52 0
39 Z 160-48 GiG 12 57 48.0666718104 +27 52 59.033603712   15.3       ~ 56 0
40 2MASX J12575392+2829594 GiC 12 57 53.9421825408 +28 29 59.362304424   15       ~ 46 0
41 MCG+05-31-037 LIN 12 58 01.5650845536 +27 29 22.847682660   14.5 14.65 14.47   ~ 55 0
42 Z 160-52 GiG 12 58 03.1671435984 +26 54 57.503683836   15.92   14.51   ~ 40 0
43 Z 160-53 GiC 12 58 03.5122020960 +27 48 53.716276944   15.7 15.20 14.96   ~ 44 0
44 Z 160-59 GiG 12 58 13.3311193368 +28 56 53.229227352   15.2 14.44     ~ 43 0
45 2MASX J12581382+2810576 GiC 12 58 13.8063924984 +28 10 57.169052400 16.38 15 15.06 14.75   ~ 44 0
46 NGC 4851 GiG 12 58 21.7112672880 +28 08 55.482369216 15.87 15.2 14.49     ~ 56 0
47 Z 160-65 GiG 12 58 30.2081987472 +28 00 53.079578820 15.30 15.0 13.88     ~ 96 0
48 LEDA 44469 GiC 12 58 31.6095417048 +27 40 24.686518512 17.05 16 15.77     ~ 39 0
49 2MASX J12583190+2802587 GiC 12 58 31.9141731072 +28 02 58.611181200 17.02 17.24 15.75 15.31 14.98 ~ 44 0
50 LEDA 83720 G 12 58 32.0712633312 +27 27 22.860678816   15     14.42 ~ 40 0
51 IC 3943 LIN 12 58 36.3535295664 +28 06 49.471215084 15.63 15.6 14.13     ~ 60 0
52 LEDA 83723 rG 12 58 38.4166085016 +27 32 38.796009144   16.69   15.15   ~ 36 0
53 NGC 4854 GiG 12 58 47.4113103480 +27 40 29.084942676 15.66 15.2 13.83 13.48   ~ 104 0
54 IC 3946 AG? 12 58 48.7288667760 +27 48 37.586925792 15.33 15.3 13.85 13.821 13.094 ~ 77 0
55 2MASX J12585077+2805019 GiC 12 58 50.7702779928 +28 05 02.470669440 16.69 16.778 15.34 15.269 14.601 ~ 54 0
56 IC 3947 AG? 12 58 52.1045260536 +27 47 06.266103540 16.00 15.866 14.61 14.341 13.633 ~ 93 0
57 2MASX J12585306+2748479 GiC 12 58 53.0580000240 +27 48 48.342614472 17.19 17.144 15.89 15.709 15.079 ~ 42 0
58 2MASX J12585523+2757529 GiC 12 58 55.2555720768 +27 57 52.976652984 16.78 16.505 15.39 15.01 14.264 ~ 82 0
59 LEDA 83729 AG? 12 58 58.1124057696 +27 35 41.015350536 16.42 15 15.02     ~ 52 0
60 2MASX J12590006+2758029 GiC 12 59 00.0748454616 +27 58 02.956799568 17.27 17.216 15.80 15.55 15.032 ~ 73 0
61 NGC 4860 GiG 12 59 03.9057463440 +28 07 25.326557148 14.84 14.7 13.24     ~ 157 0
62 2MASX J12590414+2757329 GiC 12 59 04.1588288328 +27 57 32.935155624 17.739 17.33 16.42 15.74 15.35 ~ 56 0
63 2MASX J12590459+2754389 GiC 12 59 04.6397847984 +27 54 39.532051296 16.84 16.836 15.46 15.34 14.652 ~ 60 0
64 IC 3955 GiC 12 59 06.0295581048 +27 59 48.152325300 15.78 15.591 14.31 14.011 13.323 ~ 98 0
65 IC 3957 GiC 12 59 07.5004634112 +27 46 04.045220580 16.15 15.862 14.72 14.332 13.683 ~ 113 0
66 IC 3959 GiG 12 59 08.2121809416 +27 47 02.945321736 15.56 15.2 14.03 13.771 13.064 ~ 143 0
67 IC 3963 GiC 12 59 13.5007965936 +27 46 28.624729584 16.11 15.837 14.72 14.33 13.71 ~ 91 0
68 Z 160-74 LIN 12 59 13.7080797336 +27 24 09.261692784   15.4       ~ 71 0
69 2MASX J12591638+2709288 GiC 12 59 16.4061561096 +27 09 29.093001948     15.51 15.22   ~ 18 0
70 NGC 4865 EmG 12 59 19.8737739096 +28 05 03.488821044 15.06 14.6 13.692 13.131 12.443 ~ 115 0
71 2MASX J12592016+2753098 GiC 12 59 20.1719431200 +27 53 09.554536464 16.59 16.657 15.38 15.07 14.591 ~ 89 0
72 LEDA 44573 EmG 12 59 20.2120927128 +28 11 52.521820692 17.15 16 15.42 15.08   ~ 34 0
73 2MASX J12592265+2753488 GiC 12 59 22.6199737728 +27 53 48.734841408 16.66 16.504 15.33 14.972 14.39 ~ 67 0
74 2MASX J12592491+2744198 LSB 12 59 24.9342998952 +27 44 19.850059932 16.65 16.403 15.23 14.872 14.213 ~ 69 0
75 2MASX J12592529+2758048 GiC 12 59 25.3302921888 +27 58 04.567089792 16.97 17.055 15.59 15.541 14.863 ~ 67 0
76 IC 3968 EmG 12 59 25.4893671192 +27 58 23.553468660 16.70 16.795 15.32 15.271 14.593 ~ 63 0
77 LEDA 44594 EmG 12 59 26.5981818744 +27 59 54.533097708 17.532 17.181 15.87 15.52 15.052 ~ 76 0
78 LEDA 44602 AG? 12 59 28.7291561256 +28 02 25.896174396 17.389 16.995 16.033 15.471 14.803 ~ 54 0
79 IC 3976 G 12 59 29.4017977320 +27 51 00.507145788 15.93 15.5 14.42 14.212 13.495 ~ 111 0
80 NGC 4871 LIN 12 59 29.9631023208 +27 57 23.169658968 15.59 15.1 14.07 13.801 13.113 ~ 121 0
81 2MASX J12593064+2747288 GiC 12 59 30.6487772544 +27 47 29.144981328 17.10 17.083 15.84 15.6 14.942 ~ 65 0
82 IC 3973 AG? 12 59 30.8230953864 +27 53 03.142254372 15.50 15.2 14.03 13.802 13.114 ~ 112 0
83 NGC 4873 EmG 12 59 32.7956813376 +27 59 01.023698256 15.53 15.4 14.36 14.24 13.224 ~ 125 0
84 NGC 4872 AGN 12 59 34.1212116072 +27 56 48.678716616 15.58 14.7 14.10 14.092 13.423 ~ 141 0
85 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 12.71 12.27 11.386 ~ 814 3
86 NGC 4875 GiC 12 59 37.9093929384 +27 54 26.400242232 16.03 15.92 14.57 14.322 13.605 ~ 99 0
87 LEDA 44654 GiC 12 59 40.1035652568 +27 51 17.794304208 17.518 17.112 16.34 16.02 15.02 ~ 50 0
88 LEDA 44651 EmG 12 59 40.2735433608 +27 58 05.677395348 17.47 17.375 16.02 15.812 15.153 ~ 62 0
89 Z 160-233 G 12 59 42.3031814928 +27 55 29.073263772 17.64 16.553 15.42 15.051 14.373 ~ 99 0
90 LEDA 44656 G 12 59 43.7289109656 +27 59 40.858551456 16.53 16.384 15.15 14.832 14.154 ~ 96 0
91 LEDA 44652 G 12 59 44.2059500952 +27 57 30.335521572 16.94 16.982 15.65 15.41 14.881 ~ 63 0
92 NGC 4876 LIN 12 59 44.4043327032 +27 54 44.883805032 15.61 15.1 14.18 13.992 13.333 ~ 154 0
93 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
94 Z 160-235 GiC 12 59 46.1220417624 +27 51 26.046219456 16.37 16.258 15.00 14.701 13.994 ~ 66 0
95 IC 3998 G 12 59 46.7810952336 +27 58 25.887811872 16.07 15.909 14.61 14.341 13.605 ~ 97 0
96 2MASX J12595511+2807422 GiC 12 59 55.0983190896 +28 07 42.060679572 16.70 15 15.33     ~ 86 0
97 NGC 4883 GiG 12 59 56.0172515304 +28 02 04.976091780 15.76 15.2 14.27 13.872 13.165 ~ 110 0
98 2MASX J12595670+2755483 GiC 12 59 56.6529405408 +27 55 48.133297416 16.72 16.765 15.32 14.88 14.592 ~ 71 0
99 NGC 4881 LIN 12 59 57.7481819280 +28 14 48.009858036 15.03 14.7 13.56     ~ 190 0
100 NGC 4886 EmG 13 00 04.4494334064 +27 59 15.306472032 15.595 15.1 14.294 13.712 13.092 ~ 134 0
101 2MASX J13000626+2741072 GiC 13 00 06.2590865760 +27 41 07.114336836 16.75 15.87 15.49     ~ 34 0
102 LEDA 44704 AG? 13 00 06.2918094240 +27 46 32.785530024 16.51 16.154 15.09 14.631 13.973 ~ 69 0
103 IC 4011 G 13 00 06.3940488048 +28 00 14.849196120 16.37 16.207 15.05 14.661 14.002 ~ 120 0
104 IC 4012 G 13 00 07.9959855216 +28 04 42.812545800 16.09 15.948 14.64 14.362 13.655 ~ 124 0
105 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 742 1
106 NGC 4895A EmG 13 00 09.1231203816 +28 10 13.436530176 16.33 15.6 14.94     ~ 98 0
107 LEDA 44723 G 13 00 12.8704082496 +28 04 31.779305976 16.53 16.272 15.17 14.742 14.122 ~ 81 0
108 Z 160-83 EmG 13 00 14.0031758304 +28 49 41.415386484   15.4 14.58     ~ 46 0
109 NGC 4894 AG? 13 00 16.5193713624 +27 58 03.082120068 16.28 16.106 15.04 14.71 14.051 ~ 77 0
110 2MASX J13001702+2803502 GiC 13 00 17.0317499136 +28 03 50.085089820 16.89 16.855 15.52 15.321 14.643 ~ 70 0
111 LEDA 83746 GiC 13 00 19.1059455024 +27 33 13.409044308   14       ~ 44 0
112 IC 4026 EmG 13 00 22.1409893328 +28 02 49.238219148 15.99 15.5 14.63 14.202 13.553 ~ 104 0
113 IC 4030 G 13 00 27.9700441440 +27 57 21.580940088 16.65 16.50 15.27 14.91 14.49 ~ 77 0
114 IC 4033 EmG 13 00 28.3941057864 +27 58 20.692734312 16.57 16.741 15.23 15.203 14.593 ~ 61 0
115 NGC 4896 LIN 13 00 30.7683020616 +28 20 46.935237984   15.1       ~ 86 0
116 Z 160-251 GiC 13 00 35.5780988616 +28 08 46.059465768   15.7       ~ 58 0
117 NGC 4906 G 13 00 39.7603737720 +27 55 26.243500044 15.50 15.2 14.08 13.822 13.144 ~ 136 0
118 IC 4041 EmG 13 00 40.8541511496 +27 59 47.807863512 16.19 15.88 14.77 14.343 13.733 ~ 107 0
119 LEDA 44809 EmG 13 00 42.8383665048 +27 57 47.226609072 16.34 16.013 14.96 14.501 13.813 ~ 80 0
120 Z 160-89 GiC 13 00 44.2313132568 +28 20 14.181833076 15.84 15.6 14.53     ~ 56 0
121 LEDA 44815 AG? 13 00 44.6404235112 +28 06 02.280300408 16.90 15 15.59   14.89 ~ 66 0
122 2MASX J13004737+2755196 GiC 13 00 47.4059356440 +27 55 19.874900820 16.78 16.81 15.47 15.283 14.682 ~ 48 0
123 Z 160-90 GiG 13 00 49.9247213544 +27 24 20.865181968   15.5       ~ 60 0
124 Z 160-91 LIN 13 00 52.0847397072 +28 21 58.080590892 14.99 14.9 13.56     ~ 77 0
125 NGC 4911A GiC 13 00 54.1209718584 +27 47 01.431920688 16.46 16.61 15.27 15.05 14.65 ~ 39 0
126 IC 4051 EmG 13 00 54.4630403184 +28 00 27.502143300 15.04 14.8 13.50 13.003 12.305 ~ 218 0
127 2MASX J13010904+2821352 GiC 13 01 09.0369481320 +28 21 35.227685088 16.51 16 15.29     ~ 33 0
128 Z 160-93 GiC 13 01 10.7071274040 +27 48 10.476009756 16.51 15.7 15.18     ~ 47 0
129 2MFGC 10330 GiC 13 01 12.250 +27 36 16.22   15 15.58 15.14   ~ 31 0
130 LEDA 44878 GiC 13 01 13.6313566392 +27 54 51.416297820 17.08 16.78 15.87     ~ 45 0
131 NGC 4919 GiG 13 01 17.5966333536 +27 48 32.765879124   14.9       ~ 88 0
132 2MASX J13012280+2811456 GiC 13 01 22.7807820912 +28 11 45.754464732   15       ~ 51 0
133 2MASX J13012713+2759566 GiC 13 01 27.1496982624 +27 59 57.116288112   16       ~ 39 0
134 NGC 4923 EmG 13 01 31.7992415376 +27 50 51.100173564   14.7       ~ 114 0
135 Z 160-101 LIN 13 01 47.0185231920 +28 05 41.988686424   15.2       ~ 65 0
136 2MASX J13014841+2736147 GiC 13 01 48.3795406608 +27 36 14.304786840   15       ~ 37 0
137 Z 160-100 LIN 13 01 50.2187654184 +27 53 36.859795296   15.5       ~ 71 0
138 NGC 4926 LIN 13 01 53.7302453520 +27 37 28.027389360   14.1       ~ 159 0
139 Z 160-107 GiG 13 02 04.1929610568 +29 15 12.438717768   14.9 13.95     ~ 63 0
140 2MASX J13020438+2853399 GiC 13 02 04.4217497424 +28 53 40.511498496   15.63 15.29     ~ 19 0
141 Z 160-110 GiG 13 02 21.5186348736 +28 13 50.764113192   15.2       ~ 51 0
142 NGC 4929 GiG 13 02 44.3947221240 +28 02 43.221992280   14.9       ~ 66 0
143 Z 160-115 GiG 13 02 52.7384223720 +27 51 59.790761856   15.4       ~ 48 0
144 NGC 4931 GiG 13 03 00.8766606384 +28 01 56.920384380   14.4       ~ 89 0
145 NGC 4944 GiG 13 03 49.9449729120 +28 11 08.552500332   13.3   12.69   ~ 103 0
146 IC 4133 GiG 13 03 50.7943495248 +27 59 18.107795904   15.4       ~ 60 0
147 NGC 4949 GiC 13 04 17.9269501752 +29 01 46.306501140     14.97     ~ 31 0
148 NGC 4952 LIN 13 04 58.3849361808 +29 07 20.011981188   13.39 13.01     ~ 98 1
149 NGC 4957 GiG 13 05 12.3897926664 +27 34 11.130658716   14.2   14.62   ~ 92 0
150 Z 160-132 GiG 13 05 25.2633140376 +29 17 47.315455044   15.5 14.54 13.61   ~ 36 0
151 LEDA 45310 LIN 13 05 48.8579072376 +28 06 23.473309320   17.0       ~ 16 0
152 Z 160-136 rG 13 05 59.6380292112 +29 16 43.656160872   15.0 14.53     ~ 33 0
153 Z 160-135 Sy2 13 06 05.5087284000 +28 35 34.612899108   15.5       ~ 39 0

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