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Table 2

Average optical, near-IR, and mid-IR magnitudes.

Band Field
B03 S06

USS radio sources All radio sources Depth Data USS radio sources All radio sources Depth Data
identification median Std identification median Std Δmedian KS test at 5σ Ref. identification median Std identification median Std Δmedian KS test at 5σ Ref.
rate Mag rate Mag Mag D (p-value) Mag rate Mag rate Mag Mag D (p-value) Mag

Optical NUSS = 116 Nradio = 1059 A = 1.0 NUSS = 39 Nradio = 512 A = 0.8
B 70 (~60.3%) 23.48 2.51 696 (~65.7%) 23.41 2.41 0.07 0.07 (0.85) 26.5 1 36 (~92.3%) 24.13 2.54 481 (~93.9%) 23.90 2.26 0.23 0.13 (0.52) 28.4 2
V 71 (~61.2%) 22.98 2.72 716 (~67.6%) 22.63 2.53 0.35 0.08 (0.83) 26.2 1 36 (~92.3%) 23.38 2.56 483 (~94.3%) 22.98 2.24 0.40 0.15 (0.39) 27.8 2
R 72 (~62.1%) 22.69 2.64 718 (~67.8%) 21.86 2.41 0.83 0.10 (0.54) 25.9 1 36 (~92.3%) 23.92 2.81 493 (~96.3%) 23.01 2.48 0.91 0.20 (0.12) 27.7 2
I 69 (~59.5%) 21.50 2.57 705 (~66.6%) 20.92 2.27 0.58 0.14 (0.14) 25.0 1
u 73 (~62.9%) 23.80 2.19 780 (~73.7%) 24.00 2.19 –0.20 0.09 (0.54) 26.5 3
g 85 (~73.3%) 23.48 2.43 879 (~83.0%) 23.44 2.41 0.04 0.09 (0.54) 26.4 3
r 86 (~74.1%) 22.98 2.51 899 (~84.9%) 22.75 2.48 0.23 0.10 (0.34) 26.1 3
i 86 (~74.1%) 22.43 2.52 918 (~87.1%) 21.96 2.45 0.47 0.08 (0.63) 25.9 3 37 (~94.7%) 23.22 2.86 495 (~96.7%) 22.44 2.45 0.78 0.20 (0.11) 27.7 2
z 83 (~71.5%) 21.86 2.44 897 (~85.1%) 21.36 2.33 0.50 0.10 (0.43) 25.0 3 36 (~92.3%) 22.15 2.48 487 (~95.1%) 21.72 2.19 0.43 0.13 (0.53) 26.6 2
Near-IR NUSS = 116 Nradio = 1059 A = 1.0 NUSS = 38 Nradio = 459 A = 0.63
Z 86 (~74.1%) 21.95 2.51 922 (~87.1%) 21.50 2.39 0.45 0.10 (0.39) 25.7 4
Y 82 (~70.7%) 21.33 2.36 890 (~84.0%) 20.97 2.20 0.36 0.11 (0.28) 24.5 4
J 85 (~73.3%) 20.98 2.27 927 (~87.5%) 20.69 2.10 0.29 0.11 (0.24) 24.4 4 35 (~92.1%) 22.02 2.58 428 (~93.2%) 21.29 2.18 0.73 0.15 (0.50) 24.9 5
H 86 (~74.1%) 20.83 2.14 937 (~88.5%) 20.28 1.98 0.55 0.13 (0.14) 24.1 4 35 (~92.1%) 21.34 2.40 430 (~93.7%) 20.82 2.06 0.52 0.15 (0.49) 24.2 5
K 86 (~74.1%) 20.40 2.01 951 (~89.8%) 19.87 1.87 0.53 0.11 (0.26) 23.8 4 35 (~92.1%) 21.23 2.10 433 (~94.3%) 20.28 1.68 0.95 0.19 (0.22) 24.6 5
mid-IR NUSS = 95 Nradio = 869 A = 0.82 NUSS = 36 Nradio = 444 A = 0.6
3.6 μm 72 (~75.8%) 19.57 1.72 751 (~86.4%) 19.27 1.44 0.30 0.09 (0.66) 23.1 6 32 (~88.9%) 19.87 1.50 406 (~91.4%) 19.44 1.29 0.43 0.19 (0.26) 24.0 7
4.5 μm 70 (~73.7%) 19.46 1.62 746 (~85.8%) 19.39 1.28 0.07 0.11 (0.37) 23.1 6 32 (~88.9%) 19.86 1.36 406 (~91.4%) 19.50 1.18 0.36 0.17 (0.41) 24.0 7

Notes. B03: Bondi et al. (2003); S06: Simpson et al. (2006); Std: standard deviation; Δmedian = median (USS sources) – median (full radio population). NUSS (Nradio) represent total number of USS (radio) sources falling over the regions covered by the surveys at respective wavebands. “A” is the area in deg2 of the overlapped region between the B03/S06 field and survey fields at respective wavebands. Identification rate column gives number (percentage) of sources identified in the respective band. Average magnitude errors in different bands are less than a few percent (see references of respective surveys). Because of the unavailability of optical data, the optical identification rates in the S06 field do not include 5 USS sources of low signal-to-noise ratio (<5σ) at 1.4 GHz. VIDEO K-band magnitudes are in Ks band. All the magnitudes are in AB system (UDS J, H, K magnitudes are converted from Vega to AB using conversion factors given in Hewett et al. 2006). The two sample Kolmogorov-Smirnov (KS) test examines the hypothesis that two samples come from same distribution. D = Supx | S1(x) − S2(x) | is the maximum difference between the cumulative distributions of two samples S1(x) and S2(x), respectively. The p-value is the probability that the null hypothesis, i.e.,two samples comes from same distribution, is correct.

Reference. 1: VVDS data (Ciliegi et al. 2005); 2: Subaru/Suprime-Cam data (Simpson et al. 2006); 3: CFHTLS-D1 (Ilbert et al. 2006); 4: VIDEO survey (Jarvis et al. 2013); 5: Ultra Deep Survey (UDS); 6: SERVS data (Mauduit et al. 2012); 7: SpUDS data (Dunlop et al. 2007).

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