2012A&A...539A..33M

Query : 2012A&A...539A..33M

2012A&A...539A..33M - Astronomy and Astrophysics, volume 539A, 33-33 (2012/3-1)

Overdensities of 24 µm sources in the vicinities of high-redshift radio galaxies.

MAYO J.H., VERNET J., DE BREUCK C., GALAMETZ A., SEYMOUR N. and STERN D.

Abstract (from CDS):

We present a statistical study of the environments of 63 high-redshift radio galaxies (HzRGs) between redshifts 1≤z≤5.2, using the 24µm waveband of the MIPS instrument aboard the Spitzer Space Telescope. Using a counts-in-cell analysis, a statistically significant source overdensity is found in 1.75' radius circular cells centred on the HzRGs when compared to reference fields. We report an average overdensity of δ(=Ntargets/Nreference)=2.2 ±1.2 at a flux density cut of f24µm=0.3mJy. This result implies that HzRGs are likely to lie in protoclusters of active and star-forming galaxies at high redshift. Over 95% of our targeted HzRGs lie in higher than average density fields. Further, 20 (32%) of our selected fields are found to be overdense to at least a 3σ significance, of which 9 are newly identified protocluster candidates. We observe a weak correlation between redshift and 24µm source density, and discuss the populations being probed at different redshifts. In our uniformly selected sample, which was designed to cover two orders of magnitude in radio luminosity throughout z=1-4, we find that the 24µm source density does not depend on radio luminosity. We also compare this result with recent work describing IRAC source overdensities around the same HzRGs and find correlations between the results.

Abstract Copyright: ∼

Journal keyword(s): large-scale structure of Universe - infrared: galaxies - galaxies: clusters: general - galaxies: evolution - galaxies: formation

Simbad objects: 71

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Number of rows : 71
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 ELAIS S1 reg 00 34 44 -43 28.2           ~ 204 0
2 NVSS J003453+413132 rG 00 34 53.08 +41 31 31.5           ~ 21 1
3 PMN J0039-2534 rG 00 39 56.557 -25 34 32.38           ~ 16 1
4 NVSS J010118+495011 rG 01 01 18.86 +49 50 12.3           ~ 11 1
5 PKS 0114-21 rG 01 16 51.40488104 -20 52 06.8906316     16.5     ~ 86 1
6 NVSS J012142+132058 Rad 01 21 42.7 +13 20 58           ~ 37 0
7 NVSS J013530+331702 rG 01 35 30.39 +33 17 00.8           ~ 14 1
8 NVSS J014343+325349 rG 01 43 43.85 +32 53 49.7         24 ~ 37 1
9 MRC 0152-209 rG 01 54 55.8 -20 40 26           ~ 35 2
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 NAME XMM-LSS Field reg 02 18 00 -07 00.0           ~ 259 0
14 3C 65 rG 02 23 43.2 +40 00 53   23.0       ~ 184 1
15 PMN J0253-2708 rG 02 53 16.8 -27 09 13           ~ 22 1
16 PKS J0318-2535 rG 03 18 12.1 -25 35 09   23.6 23.8     ~ 79 2
17 PKS J0327-2239 rG 03 27 04.68 -22 39 47.2           ~ 24 1
18 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2086 1
19 PMN J0352-2749 rG 03 52 51.6 -27 49 22           ~ 19 1
20 LEDA 2823818 Sy2 04 08 51.4 -24 18 15     22.40     ~ 81 2
21 4C 60.07 rG 05 12 55.1 +60 30 53           ~ 90 1
22 LEDA 2824392 QSO 05 30 25.51 -54 54 23.2           ~ 44 2
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 4C 39.24 rG 09 08 13.3 +39 43 29           ~ 69 1
27 GLEAM J092419-220140 QSO 09 24 19.92000 -22 01 41.4984       25.850   ~ 88 0
28 NVSS J093306+384150 rG 09 33 06.9294 +38 41 48.173           ~ 32 1
29 PMN J0945-2429 rG 09 45 32.6 -24 28 50           ~ 97 1
30 3C 239 rG 10 11 45.6 +46 28 20   22.5       ~ 155 1
31 4C 05.41 rG 10 19 33.4 +05 34 35   20.0       ~ 45 1
32 PKS J1019-2220 rG 10 19 49.1 -22 19 58           ~ 29 1
33 NVSS J111506+501624 rG 11 15 06.9 +50 16 24           ~ 17 1
34 B2 1121+31 B Rad 11 23 55.85 +31 41 26.1           ~ 20 0
35 MRC 1138-262 AGN 11 40 48.91 -26 29 08.9     22.00     ~ 293 1
36 3C 266 rG 11 45 43.384 +49 46 07.90   22       ~ 147 1
37 4C 39.37 rG 12 35 04.6 +39 25 41   21.4       ~ 69 1
38 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1155 1
39 4C 03.24 rG 12 45 38.4 +03 23 18           ~ 74 1
40 NAME Lockman 3 Field reg 13 34 36 +37 54.6           ~ 4 0
41 [DBC2004] M03 rG 13 38 26.05 -19 42 30.5       22.4   ~ 99 0
42 4C 24.28 rG 13 48 14.890 +24 15 50.34     17.7     ~ 47 1
43 3C 294 rG 14 06 44.30 +34 11 30.1           ~ 232 1
44 4C -00.54 rG 14 13 15.65 -00 23 07.4           ~ 49 0
45 4C 63.20 rG 14 36 37.4 +63 19 13         23.6 ~ 80 1
46 ELAIS N1 reg 16 10 01 +54 30.6           ~ 421 0
47 ELAIS N2 reg 16 36 48.0 +41 01 45           ~ 167 0
48 4C 10.48 rG 17 10 06.6 +10 31 06           ~ 38 1
49 6C 171301+501842 Sy2 17 14 14.8 +50 15 31   24.05   22.64   ~ 109 1
50 WSTB 53W59 rG 17 19 20.26 +50 00 19.6           ~ 9 0
51 WSTB 53W69 rG 17 20 02.54 +49 44 51.0           ~ 39 0
52 WSTB 53W91 rG 17 22 32.73 +50 06 01.9           ~ 79 0
53 3C 356 QSO 17 24 20.2 +50 57 14   21.5 21.5     ~ 224 1
54 7C 1751+6809 rG 17 50 49.859 +68 08 25.97           ~ 15 0
55 NVSS J175705+651953 rG 17 57 05.5 +65 19 54           ~ 30 2
56 3C 368.0 rG 18 05 06.4 +11 01 33   21.5       ~ 249 1
57 NVSS J180556+633313 rG 18 05 57.1 +63 33 14           ~ 20 1
58 3C 372 rG 18 10 55.7 +40 45 24   22.1       ~ 68 1
59 NAME TX J1908+7220 rG 19 08 23.3 +72 20 11           ~ 55 1
60 NVSS J191149+634209 Rad 19 11 49.5 +63 42 09           ~ 16 1
61 GLEAM J200753-131643 QSO 20 07 53.3 -13 16 44           ~ 25 1
62 LEDA 2830476 Sy1 20 27 59.4 -21 40 57   22.4       ~ 75 1
63 PMN J2051-2702 rG 20 51 03.6 -27 03 03           ~ 36 1
64 PMN J2106-2404 rG 21 06 58.5 -24 05 06   23.0       ~ 76 1
65 4C 23.56 rG 21 07 15.080 +23 31 43.71           ~ 111 0
66 4C 19.71 rG 21 44 07.5 +19 29 11           ~ 44 1
67 USS 2202+128 rG 22 05 14.100 +13 05 33.50           ~ 5 0
68 NVSS J222743-270501 rG 22 27 43.2 -27 05 02           ~ 29 1
69 6C 232758+390950 EmG 23 30 24.94 +39 27 12.0   24.70 23.97     ~ 54 2
70 4C 28.58 rG 23 51 59.2 +29 10 29           ~ 42 1
71 3C 470.0 rG 23 58 35.4 +44 04 39   22.5       ~ 114 1

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