2007MNRAS.378..551B


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.24CEST05:30:30

2007MNRAS.378..551B - Mon. Not. R. Astron. Soc., 378, 551-562 (2007/June-3)

Imaging and spectroscopy of ultrasteep spectrum radio sources.

BORNANCINI C.G., DE BREUCK C., DE VRIES W., CROFT S., VAN BREUGEL W., ROTTGERING H. and MINNITI D.

Abstract (from CDS):

We present a sample of 40 ultrasteep spectrum (USS; α ≤ - 1.3, Sν∝ να) radio sources selected from the Westerbork in the Southern Hemisphere (WISH) catalogue. The USS sources have been imaged in K band at the Cerro Tololo Inter-American Observatory (CTIO) and with the Very Large Telescope (VLT) at Cerro Paranal. We also present VLT, Keck and William Herschel Telescope (WHT) optical spectroscopy of 14 targets selection from four different USS samples. For 12 sources, we have been able to determine the redshifts, including four new radio galaxies at z > 3. We find that most of our USS sources have predominantly small (<6arcsec) radio sizes and faint magnitudes (K ≳ 18). The mean K-band counterpart magnitude is. The expected redshift distribution estimated using the Hubble K-z diagram has a mean of, which is higher than the predicted redshift obtained for the Sydney University Molonglo Sky Survey-NRAO VLA Sky Survey (SUMSS-NVSS) sample and the expected redshift obtained in the 6C** survey. The compact USS sample analysed here may contain a higher fraction of galaxies which are high redshift and/or are heavily obscured by dust. Using the 74, 352 and 1400MHz flux densities of a subsample, we construct a radio colour-colour diagram. We find that all but one of our USS sources have a strong tendency to flatten below 352MHz. We also find that the highest redshift source from this paper (at z = 3.84) does not show evidence for spectral flattening down to 151MHz. This suggests that very low frequency selected USS samples will likely be more efficient to find high redshift galaxies.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

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

Simbad objects: 42

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Number of rows : 42

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 WISH J0037-1904 Rad 00 37 23.76 -19 04 32.2           ~ 2 0
2 NVSS J014138-140608 Rad 01 41 37.5 -14 06 10           ~ 5 1
3 WISH J0224-1701 Rad 02 24 16.23 -17 01 01.3           ~ 2 0
4 TXS 0244-170 Rad 02 46 52.89 -16 49 28.1           ~ 2 0
5 GSPC S301-D * 03 26 54.0 -39 50 38           ~ 16 0
6 PMN J0340-6507 QSO 03 40 44.6 -65 07 12           ~ 15 1
7 2MASX J05103192-1838440 G 05 10 31.923 -18 38 44.06     19.5     ~ 21 1
8 [DVR2000] WN J0528+6549 QSO 05 28 46.07 +65 49 57.3           ~ 5 0
9 MRC 0559-394 QSO 06 01 00.6 -39 26 16           ~ 8 1
10 TXS 0602-202 Rad 06 04 57.8 -20 15 55           ~ 5 1
11 [DVR2000] WN J0610+6611 Rad 06 10 08.59 +66 11 43.1           ~ 3 0
12 [DVR2000] WN J0716+5107 QSO 07 16 40.50 +51 07 04.7           ~ 4 0
13 NVSS J091034-222843 Rad 09 10 34.3 -22 28 45           ~ 9 1
14 WISH J0912-1655 QSO 09 12 57.24 -16 55 54.8           ~ 4 0
15 WISH J1047-1836 Rad 10 47 15.51 -18 36 31.1           ~ 3 0
16 TXS 1046-127 QSO 10 49 06.24 -12 58 18.7           ~ 10 1
17 WISH J1052-1812 Rad 10 52 00.82 -18 12 32.3           ~ 3 0
18 6C 105034+544035 QSO 10 53 36.3 +54 24 42           ~ 10 1
19 WISH J1101-2134 Rad 11 01 53.63 -21 34 28.5           ~ 2 0
20 NVSS J110949-191753 Rad 11 09 49.9 -19 17 54           ~ 4 1
21 WISH J1132-2102 Rad 11 32 52.66 -21 02 45.0           ~ 2 0
22 WISH J1138-1324 Rad 11 38 05.42 -13 24 23.5           ~ 3 0
23 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 255 1
24 NVSS J115009-131753 Rad 11 50 09.2 -13 17 56           ~ 4 1
25 WISH J1222-2129 Rad 12 22 48.22 -21 29 10.0           ~ 3 0
26 WISH J1255-1913 Rad 12 55 52.66 -19 13 00.6           ~ 3 0
27 NVSS J133147-194726 Rad 13 31 46.6 -19 47 27           ~ 4 1
28 WISH J1450-1525 Rad 14 50 42.63 -15 25 45.2           ~ 2 0
29 WISH J1516-2110 Rad 15 16 42.32 -21 10 27.4           ~ 3 0
30 WISH J1518-1225 Rad 15 18 43.43 -12 25 35.6           ~ 3 0
31 WISH J1557-1349 Rad 15 57 41.72 -13 49 54.8           ~ 3 0
32 WISH J1603-1500 Rad 16 03 04.78 -15 00 53.8           ~ 3 0
33 WISH J1637-1931 Rad 16 37 44.85 -19 31 22.9           ~ 6 0
34 TXS 1938-199 QSO 19 41 00.28 -19 52 14.0           ~ 9 0
35 WISH J2002-1842 Rad 20 02 56.00 -18 42 47.8           ~ 3 0
36 [VV2010] J200753.3-131644 QSO 20 07 53.3 -13 16 44           ~ 24 1
37 TXS 2006-308 QSO 20 09 47.9 -30 40 04           ~ 17 1
38 4C 23.56 EmG 21 07 14.82 +23 31 45.0           ~ 97 0
39 WISH J2214-2353 Rad 22 14 14.03 -23 53 25.6           ~ 2 0
40 MRC 2222-771 QSO 22 26 55.30 -76 54 45.0           ~ 6 1
41 WISH J2343-1947 Rad 23 43 16.11 -19 47 20.0           ~ 1 0
42 PKS J2352-6153 QSO 23 52 53.5 -61 53 44           ~ 8 1

    Equat.    Gal    SGal    Ecl

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2021.06.24-05:30:30

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