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Table 4

Fraction of high-z sources in faint and bright USS samples.

Sample Flux limit Spectral index Area Sources USS density Median Fraction of USS Ref.
(mJy) limit sr (sr-1) redshift with K> 19.5

WENSS-NVSS S1.4 GHz> 10 2.27 343 151 1.87 12/44 (27%) 1
TEXAS-NVSS S1.4 GHz> 10 5.58 268 48 2.10 8/24 (33%) 1
MRC-PMN S408 MHz> 700 2.23 58 26 0.88 0/29 1
6C* S151 MHz> 960 81 0.133 29 218 1.90 2/24 (8%) 2
SUMSS-NVSS S1.4 GHz> 15 0.11 53 482 1.20 13/53 (25%) 3
aVLA-GMRT S610 MHz> 0.1 .3 1.71 × 10-4 58 3.40 × 105 0.60 .... 4
Our S325 MHz > 0.5 5.48 × 10-4 160 2.92 × 105 1.31 35/117 (30%) 5

Notes. The comparison of flux limits, USS source densities for bright samples is given in De Breuck et al. (2004). The median redshift of sample is based on only sources with available redshift estimates. We opted average mean value of redshift, if median redshift is unavailable for bright USS sample. Low median redshift for faint USS sample of Afonso et al. (2011) is likely to be the result of the unavailability of redshift of 47% sample sources that are faint at 3.6 μm and are candidate high-z sources.

(a)

K-band magnitudes are unavailable for the USS sample sources (.3) presented by Afonso et al. (2011).

Reference. (1) De Breuck et al. (2000, 2002a); (2) Blundell et al. (1998); Jarvis et al. (2001a); (3) De Breuck et al. (2004, 2006); (4) Afonso et al. (2011); (5) this paper.

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