2006MNRAS.367..693I

Query : 2006MNRAS.367..693I

2006MNRAS.367..693I - Mon. Not. R. Astron. Soc., 367, 693-708 (2006/April-1)

Deviations from passive evolution - star formation and the ultraviolet excess in z∼ 1 radio galaxies.

INSKIP K.J., BEST P.N. and LONGAIR M.S.

Abstract (from CDS):

Galaxy colours are determined for two samples of 6C and 3CR radio sources at z∼ 1, differing by a factor of ∼6 in radio power. Corrections are made for emission-line contamination and the presence of any nuclear point source, and the data analysed as a function of both redshift and the radio source properties. The galaxy colours are remarkably similar for the two populations, and the ultraviolet excess evolves with radio source size similarly in both samples, despite the fact that the alignment effect is more extensive for the more powerful 3CR radio galaxies. These results seem to suggest that the alignment effect at these redshifts does not scale strongly with radio power, and is instead more closely dependent on galaxy mass (which is statistically comparable for the two samples). However, it is likely that the presence of relatively young (≲several times 108-yr-old) stellar populations has considerably contaminated the K-band flux of these systems, particularly in the case of the more powerful 3CR sources, which are ∼0.5mag more luminous than the predictions of passive evolution models at z∼ 1. The higher luminosity of the 3CR alignment effect is balanced by emission at longer wavelengths, thereby leading to comparable colours for the two samples.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: photometry

Simbad objects: 46

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Number of rows : 46
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 3C 13 rG 00 34 14.6 +39 24 17   22.5       ~ 140 1
2 3C 22.0 Sy1 00 50 56.3 +51 12 03   22.0       ~ 150 0
3 3C 34.0 rG 01 10 18.7 +31 47 20   21       ~ 174 2
4 NGC 541 AG? 01 25 44.3069825040 -01 22 46.086331044 13.42 13.03 12.08     ~ 213 2
5 3C 41.0 rG 01 26 44.4 +33 13 11   21       ~ 169 1
6 3C 49 rG 01 41 09.2 +13 53 28   22.327 20.920 20.876   ~ 183 1
7 3C 65 rG 02 23 43.2 +40 00 53   23.0       ~ 184 1
8 3C 68.2 rG 02 34 23.9 +31 34 17   24       ~ 138 1
9 NVSS J082826+344249 rG 08 28 26.7 +34 42 50           ~ 25 1
10 3C 217 Rad 09 08 50.6 +37 48 19   22       ~ 128 1
11 3C 226.0 Sy1 09 44 16.51944 +09 46 16.9068   19.5       ~ 129 2
12 NVSS J094618+394418 rG 09 46 18.6 +39 44 19           ~ 32 1
13 3C 239 rG 10 11 45.6 +46 28 20   22.5       ~ 155 1
14 NVSS J101412+361727 rG 10 14 12.9 +36 17 25   21.5       ~ 32 1
15 4C 37.27A rG 10 20 39.7 +36 56 59           ~ 38 1
16 3C 241 rG 10 21 54.5 +21 59 30   23.5       ~ 168 0
17 4C 39.31 rG 10 22 55.2 +39 08 49   22.7       ~ 44 1
18 3C 247 QSO 10 58 58.8 +43 01 23   21.5       ~ 160 1
19 NVSS J110326+344947 rG 11 03 26.0 +34 49 46           ~ 25 1
20 3C 252.0 G 11 11 32.0 +35 40 45   22       ~ 127 1
21 4C 37.31 rG 11 32 35.9 +36 54 12   23       ~ 40 1
22 3C 265.0 Sy1 11 45 29.0 +31 33 50   20.0       ~ 247 0
23 3C 266 rG 11 45 43.384 +49 46 07.90   22       ~ 147 1
24 3C 267 rG 11 49 56.5 +12 47 19   22.5       ~ 155 2
25 4C 35.27 rG 12 07 31.84 +35 03 06.3   22       ~ 39 1
26 4C 36.20 rG 12 20 09.8 +36 29 07   22.3       ~ 35 1
27 3C 277.2 Sy1 12 53 32.425 +15 42 25.29   21.5       ~ 152 1
28 2C 1066 SyG 12 56 57.5 +47 20 20   22.0       ~ 281 0
29 NVSS J125905+363158 rG 12 59 05.9 +36 31 57           ~ 32 1
30 NVSS J125929+361704 rG 12 59 30.00936 +36 17 02.6304           ~ 29 1
31 6C 131905+425044 Sy2 13 21 17.813 +42 35 15.38   16.86 16.23     ~ 276 1
32 3C 289 QSO 13 45 26.699 +49 46 31.39   23       ~ 161 1
33 ICRF J134733.3+121724 Sy2 13 47 33.36161873 +12 17 24.2398927   19.28 18.44 15.718   ~ 597 3
34 9C J1503+4528 rG 15 03 +45.5           ~ 8 0
35 3C 324.0 Sy1 15 49 49.2 +21 25 39   21.5       ~ 309 0
36 3C 337 QSO 16 28 53.9 +44 19 03   20.0       ~ 148 1
37 3C 340 rG 16 29 37.8 +23 20 14   22       ~ 125 1
38 3C 352 rG 17 10 44.1001 +46 01 29.834   22.8       ~ 149 1
39 WSTB 53W69 rG 17 20 02.54 +49 44 51.0           ~ 39 0
40 WSTB 53W91 rG 17 22 32.73 +50 06 01.9           ~ 79 0
41 3C 356 QSO 17 24 20.2 +50 57 14   21.5 21.5     ~ 224 1
42 3C 368.0 rG 18 05 06.4 +11 01 33   21.5       ~ 249 1
43 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2366 2
44 3C 437 rG 21 47 25.1 +15 20 38   23       ~ 128 2
45 3C 441 rG 22 06 04.9 +29 29 20   21.0       ~ 197 3
46 3C 470.0 rG 23 58 35.4 +44 04 39   22.5       ~ 114 1

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