2006MNRAS.366...58D

Query : 2006MNRAS.366...58D

2006MNRAS.366...58D - Mon. Not. R. Astron. Soc., 366, 58-72 (2006/February-2)

A search for distant radio galaxies from SUMSS and NVSS - II. Optical spectroscopy.

DE BREUCK C., KLAMER I., JOHNSTON H., HUNSTEAD R.W., BRYANT J., ROCCA-VOLMERANGE B. and SADLER E.M.

Abstract (from CDS):

This is the second in a series of papers presenting observations and results for a sample of 76 ultrasteep-spectrum (USS) radio sources in the Southern hemisphere designed to find galaxies at high redshift. Here, we focus on the optical spectroscopy programme for 53 galaxies in the sample. We report 35 spectroscopic redshifts, based on observations with the Very Large Telescope (VLT), the New Technology Telescope (NTT) and the 2.3-m telescope of the Australian National University (ANU); they include five radio galaxies with z > 3. Spectroscopic redshifts for the remaining 18 galaxies could not be confirmed: three are occulted by Galactic stars, eight show continuum emission but no discernible spectral lines, whilst the remaining seven galaxies are undetected in medium-deep VLT integrations. The latter are either at very high redshift (z≳ 7) or heavily obscured by dust. A discussion of the efficiency of the USS technique is presented. Based on the similar space density of z > 3 radio galaxies in our sample compared with other USS-selected samples, we argue that USS selection at 843-1400MHz is an efficient and reliable technique for finding distant radio galaxies.

Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS

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

Simbad objects: 36

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Number of rows : 36
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 PKS J0013-3225 Rad 00 13 39.54 -32 24 47.8           ~ 4 1
2 NVSS J002131-342225 Rad 00 21 31.32 -34 22 28.6           ~ 4 1
3 NVSS J002219-360728 Rad 00 22 19.5 -36 07 30           ~ 3 1
4 NVSS J002402-325253 rG 00 24 02.34 -32 52 56.9           ~ 8 1
5 NVSS J002627-323653 Rad 00 26 27.96 -32 36 48.9           ~ 3 1
6 NVSS J011606-331241 Rad 01 16 06.80 -33 12 43.2           ~ 6 1
7 NVSS J012904-324815 rG 01 29 04.267 -32 48 13.17   17.770   16.057   ~ 5 1
8 PMN J0152-3340 Rad 01 52 32.400 -33 39 52.15           ~ 10 1
9 NVSS J015324-334117 Rad 01 53 24.6 -33 41 14           ~ 4 1
10 GLEAM J015544-330633 QSO 01 55 44.6109374208 -33 06 34.809221484           ~ 6 1
11 NVSS J021308-322338 Rad 02 13 08.10 -32 23 39.4           ~ 7 1
12 NVSS J021716-325121 Rad 02 17 16.12 -32 51 20.4           ~ 4 1
13 NVSS J030639-330432 Rad 03 06 39.509 -33 04 28.91           ~ 9 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 J232408-353547 Rad 23 24 08.5995063144 -35 35 44.837578608           ~ 3 1
32 NVSS J232602-350321 Rad 23 26 02.6 -35 03 27           ~ 4 1
33 NVSS J232651-370909 rG 23 26 51.39 -37 09 11.3           ~ 7 1
34 NVSS J233558-362236 Rad 23 35 59.0 -36 22 36           ~ 3 1
35 PKS 2339-353 rG 23 41 45.85196 -35 06 22.1963           ~ 22 1
36 GLEAM J234904-362448 QSO 23 49 04.3343922528 -36 24 52.735397472           ~ 6 1

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