2010ApJ...725...36D

Query : 2010ApJ...725...36D

2010ApJ...725...36D - Astrophys. J., 725, 36-62 (2010/December-2)

The Spitzer high-redshift radio galaxy survey.

DE BREUCK C., SEYMOUR N., STERN D., WILLNER S.P., EISENHARDT P.R.M., FAZIO G.G., GALAMETZ A., LACY M., RETTURA A., ROCCA-VOLMERANGE B. and VERNET J.

Abstract (from CDS):

We present results from a comprehensive imaging survey of 70 radio galaxies at redshifts 1 < z < 5.2 using all three cameras on board the Spitzer Space Telescope. The resulting spectral energy distributions unambiguously show a stellar population in 46 sources and hot dust emission associated with the active nucleus in 59. Using a new rest-frame S_3 µm/S1.6 µm_ versus S_5 µm/S3 µm_criterion, we identify 42 sources where the rest-frame 1.6 µm emission from the stellar population can be measured. For these radio galaxies, the median stellar mass is high, 2x1011 M☉, and remarkably constant within the range 1 < z < 3. At z>3, there is tentative evidence for a factor of two decrease in stellar mass. This suggests that radio galaxies have assembled the bulk of their stellar mass by z ∼ 3, but confirmation by more detailed decomposition of stellar and active galactic nucleus (AGN) emission is needed. The rest-frame 500 MHz radio luminosities are only marginally correlated with stellar mass but are strongly correlated with the rest-frame 5 µm hot dust luminosity. This suggests that the radio galaxies have a large range of Eddington ratios. We also present new Very Large Array 4.86 and 8.46 GHz imaging of 14 radio galaxies and find that radio core dominance–an indicator of jet orientation–is strongly correlated with hot dust luminosity. While all of our targets were selected as narrow-lined, type 2 AGNs, this result can be understood in the context of orientation-dependent models if there is a continuous distribution of orientations from obscured type 2 to unobscured type 1 AGNs rather than a clear dichotomy. Finally, four radio galaxies have nearby (<6'') companions whose mid-IR colors are suggestive of their being AGNs. This may indicate an association between radio galaxy activity and major mergers.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: high-redshift - radio continuum: galaxies

Simbad objects: 74

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Number of rows : 74
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 NVSS J003453+413132 rG 00 34 53.08 +41 31 31.5           ~ 21 1
2 PMN J0039-2534 rG 00 39 56.557 -25 34 32.38           ~ 16 1
3 NVSS J010118+495011 rG 01 01 18.86 +49 50 12.3           ~ 11 1
4 PKS 0114-21 rG 01 16 51.40488104 -20 52 06.8906316     16.5     ~ 86 1
5 NVSS J012142+132058 Rad 01 21 42.7 +13 20 58           ~ 37 0
6 NVSS J013530+331702 rG 01 35 30.39 +33 17 00.8           ~ 14 1
7 NVSS J014343+325349 rG 01 43 43.85 +32 53 49.7         24 ~ 37 1
8 MRC 0152-209 rG 01 54 55.8 -20 40 26           ~ 35 2
9 MRC 0156-252 rG 01 58 33.480 -24 59 32.01   22.7       ~ 57 1
10 NVSS J020510+224250 Rad 02 05 10.6 +22 42 50           ~ 29 1
11 PKS J0213-2525 rG 02 13 30.6 -25 25 20           ~ 15 1
12 PMN J0214-1158 rG 02 14 17.4 -11 58 47           ~ 60 1
13 3C 65 rG 02 23 43.2 +40 00 53   23.0       ~ 185 1
14 PMN J0253-2708 rG 02 53 16.8 -27 09 13           ~ 22 1
15 PKS J0318-2535 rG 03 18 12.1 -25 35 09   23.6 23.8     ~ 79 2
16 PKS J0327-2239 rG 03 27 04.68 -22 39 47.2           ~ 24 1
17 PMN J0352-2749 rG 03 52 51.6 -27 49 22           ~ 19 1
18 LEDA 2823818 Sy2 04 08 51.4 -24 18 15     22.40     ~ 82 2
19 4C 60.07 rG 05 12 55.1 +60 30 53           ~ 90 1
20 [CMV96] 4C 60.07 B Rad 05 12 55.46 +60 30 50.7           ~ 2 0
21 LEDA 2824392 QSO 05 30 25.51 -54 54 23.2           ~ 45 2
22 [DVR2000] WN J0617+5012 rG 06 17 39.37 +50 12 54.7           ~ 15 0
23 4C 41.17 rG 06 50 52.098 +41 30 30.53           ~ 337 1
24 NVSS J074729+365438 rG 07 47 29.4 +36 54 38           ~ 20 1
25 NVSS J082348+363245 rG 08 23 48.62 +36 32 30.1           ~ 23 1
26 NVSS J082838+252827 rG 08 28 38.7 +25 28 28           ~ 20 1
27 NVSS J083053+191314 rG 08 30 53.5 +19 13 16           ~ 72 1
28 NVSS J090432+353903 rG 09 04 32.4 +35 39 03   21.4       ~ 28 1
29 NVSS J090530+340756 rG 09 05 30.1 +34 07 57   24.0 23.800 23.500   ~ 160 1
30 4C 39.24 rG 09 08 13.3 +39 43 29           ~ 69 1
31 GLEAM J092419-220140 QSO 09 24 19.92000 -22 01 41.4984       25.850   ~ 88 0
32 NVSS J093306+384150 rG 09 33 06.9294 +38 41 48.173           ~ 32 1
33 PMN J0945-2429 rG 09 45 32.6 -24 28 50           ~ 97 1
34 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5865 6
35 3C 239 rG 10 11 45.6 +46 28 20   22.5       ~ 156 1
36 4C 05.41 rG 10 19 33.4 +05 34 35   20.0       ~ 45 1
37 PKS J1019-2220 rG 10 19 49.1 -22 19 58           ~ 29 1
38 NVSS J111506+501624 rG 11 15 06.9 +50 16 24           ~ 17 1
39 3C 257 rG 11 23 09.0 +05 30 21           ~ 91 1
40 B2 1121+31 B Rad 11 23 55.85 +31 41 26.1           ~ 20 0
41 MRC 1138-262 rG 11 40 48.91 -26 29 08.9     22.00     ~ 294 1
42 3C 266 rG 11 45 43.384 +49 46 07.90   22       ~ 148 1
43 4C 39.37 rG 12 35 04.6 +39 25 41   21.4       ~ 69 1
44 4C 03.24 rG 12 45 38.4 +03 23 18           ~ 74 1
45 [DBC2004] M03 rG 13 38 26.05 -19 42 30.5       22.4   ~ 99 0
46 4C 24.28 rG 13 48 14.890 +24 15 50.34     17.7     ~ 47 1
47 3C 294 rG 14 06 44.30 +34 11 30.1           ~ 232 1
48 4C -00.54 rG 14 13 15.65 -00 23 07.4           ~ 50 0
49 4C 63.20 rG 14 36 37.4 +63 19 13         23.6 ~ 80 1
50 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2961 4
51 4C -00.62 rG 16 01 17.5 -00 28 47           ~ 68 1
52 4C 10.48 rG 17 10 06.6 +10 31 06           ~ 38 1
53 6C 171301+501842 Sy2 17 14 14.8 +50 15 31   24.05   22.64   ~ 110 1
54 WSTB 53W91 rG 17 22 32.73 +50 06 01.9           ~ 79 0
55 3C 356 QSO 17 24 20.2 +50 57 14   21.5 21.5     ~ 225 1
56 7C 1751+6809 rG 17 50 49.859 +68 08 25.97           ~ 15 0
57 NVSS J175705+651953 rG 17 57 05.5 +65 19 54           ~ 30 2
58 3C 368.0 rG 18 05 06.4 +11 01 33   21.5       ~ 250 1
59 NVSS J180556+633313 rG 18 05 57.1 +63 33 14           ~ 21 1
60 3C 372 rG 18 10 55.7 +40 45 24   22.1       ~ 68 1
61 NAME TX J1908+7220 rG 19 08 23.3 +72 20 11           ~ 56 1
62 NVSS J191149+634209 Rad 19 11 49.5 +63 42 09           ~ 16 1
63 GLEAM J200753-131643 QSO 20 07 53.3 -13 16 44           ~ 25 1
64 LEDA 2830476 Sy1 20 27 59.4 -21 40 57   22.4       ~ 75 1
65 MRC 2048-272B Rad 20 51 03.30 -27 03 03.2           ~ 1 0
66 PMN J2051-2702 rG 20 51 03.6 -27 03 03           ~ 36 1
67 PMN J2106-2404 rG 21 06 58.5 -24 05 06   23.0       ~ 76 1
68 4C 23.56 rG 21 07 15.080 +23 31 43.71           ~ 112 0
69 4C 19.71 rG 21 44 07.5 +19 29 11           ~ 44 1
70 NVSS J220514+130533 rG 22 05 14.4 +13 05 33           ~ 24 1
71 NVSS J222743-270501 rG 22 27 43.2 -27 05 02           ~ 29 1
72 6C 232758+390950 EmG 23 30 24.94 +39 27 12.0   24.70 23.97     ~ 54 2
73 4C 28.58 rG 23 51 59.2 +29 10 29           ~ 42 1
74 3C 470.0 rG 23 58 35.4 +44 04 39   22.5       ~ 114 1

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