2006MNRAS.366.1067B

Query : 2006MNRAS.366.1067B

2006MNRAS.366.1067B - Mon. Not. R. Astron. Soc., 366, 1067-1074 (2006/March-1)

Clustering and properties of K-band companion galaxies around ultrasteep spectrum radio sources.

BORNANCINI C.G., LAMBAS D.G. and DE BREUCK C.

Abstract (from CDS):

We have analysed galaxy properties in the environment of a sample of 70 ultrasteep spectrum (USS) radio sources selected from the Sydney University Molonglo Sky Survey and the National Radio Astronomy Observatories (NRAO) Very Large Array Sky Survey catalogues, using near-infrared data complete down to Ks= 20. We have quantified galaxy excess around USS targets using an Abell-type measurement N0.5. We find that most of the USS fields studied are compatible with being Abell class 0 richness clusters. A statistical analysis of the distribution of companion galaxies around USS radio sources shows a pronounced tendency for such objects to be found in the direction defined by the radio axis, suggesting that they may be related to the presence of the radio sources. We have also measured the central concentration of light of the USS sample and compared these to the values obtained for field galaxies and galaxies selected using other methods. By using Spearman statistics to disentangle richnesses and concentration indices dependences, we detect a weak, but significant, positive correlation. We find that at z > 2 USS radio sources are more concentrated than field galaxies at similar redshifts, indicating that these objects trace the most massive systems at high redshift.

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

Journal keyword(s): galaxies: clusters: general - galaxies: high-redshift - large-scale structure of Universe

Simbad objects: 35

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Number of rows : 35
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 NVSS J002131-342225 Rad 00 21 31.32 -34 22 28.6           ~ 4 1
2 PMN J0024-3258 Rad 00 23 59.38 -32 57 57.7           ~ 4 1
3 NVSS J002402-325253 rG 00 24 02.34 -32 52 56.9           ~ 8 1
4 NAME Phoenix Deep Field reg 01 14 -45.7           ~ 27 0
5 NVSS J011606-331241 Rad 01 16 06.80 -33 12 43.2           ~ 6 1
6 PMN J0152-3340 Rad 01 52 32.400 -33 39 52.15           ~ 10 1
7 NVSS J015324-334117 Rad 01 53 24.6 -33 41 14           ~ 4 1
8 GLEAM J015544-330633 QSO 01 55 44.6109374208 -33 06 34.809221484           ~ 6 1
9 NVSS J021308-322338 Rad 02 13 08.10 -32 23 39.4           ~ 7 1
10 NVSS J021716-325121 Rad 02 17 16.12 -32 51 20.4           ~ 4 1
11 NVSS J030639-330432 Rad 03 06 39.509 -33 04 28.91           ~ 9 1
12 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
13 PKS J1140-2628 rG 11 40 48.35884 -26 29 08.6316     22.00     ~ 325 1
14 NVSS J202026-372823 Rad 20 20 26.81 -37 28 21.8           ~ 5 1
15 NVSS J202140-373942 Rad 20 21 40.39 -37 39 37.5           ~ 4 1
16 GLEAM J202945-344810 QSO 20 29 45.8129533224 -34 48 15.590190456           ~ 7 1
17 NVSS J204147-331731 Rad 20 41 47.63 -33 17 29.9           ~ 4 1
18 NVSS J213510-333703 rG 21 35 10.47 -33 37 01.3           ~ 9 1
19 NVSS J225719-343954 Rad 22 57 19.56 -34 39 53.9           ~ 8 1
20 NVSS J230035-363410 Rad 23 00 35.87 -36 34 10.9           ~ 4 1
21 NVSS J230123-364656 rG 23 01 23.34377 -36 46 59.9274           ~ 7 1
22 NVSS J230203-340932 Rad 23 02 03.83 -34 09 25.5           ~ 4 1
23 NVSS J231144-362215 rG 23 11 44.97 -36 22 15.1           ~ 7 1
24 NVSS J231338-362708 Rad 23 13 38.73 -36 27 08.4           ~ 4 1
25 NVSS J231357-372413 Rad 23 13 57.46 -37 24 15.7           ~ 3 1
26 NVSS J231402-372925 Rad 23 14 02.42 -37 29 28.1           ~ 7 1
27 NVSS J231519-342710 Rad 23 15 19.37 -34 27 10.0           ~ 4 1
28 NVSS J231727-352606 Rad 23 17 27.30 -35 26 03.2           ~ 9 1
29 NVSS J232001-363246 Rad 23 20 01.17 -36 32 46.8           ~ 2 0
30 NVSS J232100-360223 Rad 23 21 00.61 -36 02 23.1           ~ 7 1
31 NVSS J232602-350321 Rad 23 26 02.6 -35 03 27           ~ 4 1
32 NVSS J232651-370909 rG 23 26 51.39 -37 09 11.3           ~ 7 1
33 NVSS J233558-362236 Rad 23 35 59.0 -36 22 36           ~ 3 1
34 PKS 2339-353 rG 23 41 45.85196 -35 06 22.1963           ~ 22 1
35 GLEAM J234904-362448 QSO 23 49 04.3343922528 -36 24 52.735397472           ~ 6 1

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