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 | ![]() |
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 | ![]() |
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.
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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