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Table 1

A summary of the radio emission observed from the 8 o’clock arc lens system.

Component μa S1.4   GHz L1.4   GHz SFR
(μJy) (W Hz-1) (M   yr-1)

A3 (2.2σ detection) 4 80 ± 36b 9 ± 4 × 1023 560 ± 300
A3 (3σ upper limit) 4 ≤108b ≤1.3 × 1024 ≤750
A2 (including jet) 4 95 ± 36b 1.1 ± 0.4 × 1024 660 ± 310
A1+A2+A3 (including jet) 12 430 ± 70 1.7 ± 0.3 × 1024 1000 ± 350
All (NVSS) 12 4700 ± 500 1.9 ± 0.2 × 1025 11000 ± 3500

Prediction from optical/NIR-based SFR
SFR S1.4   GHz L1.4   GHz
(M   yr-1) (μJy) (W Hz-1)

270 ± 75 120 ± 50 4.6 ± 1.9 × 1023

Notes. From our VLA observations we quote the observed (gravitationally lensed) flux-densities and the rest-frame (unlensed) luminosities at 1.4 GHz. We give the estimated SFRs, corrected for the lensing magnification. For comparison, we also show the data from NVSS and the expected radio emission based on the optical/NIR derived SFR.

(a)

Magnification correction;

(b)

flux density per beam.

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