Abstract
Abstract We made two new sensitive (rms noise μJy beam−1) high-resolution (θ = 3.″0 and θ = 0.″66 FWHM) S-band (2 < ν < 4 GHz) images covering a single JVLA primary beam (FWHM ≈ 14′) centered on J2000 , δ = +59°01′ in the Lockman Hole. These images yielded a catalog of 792 radio sources, 97.7 ± 0.8% of which have infrared counterparts stronger than S ≈ 2 μJy at λ = 4.5 μm. About 91% of the radio sources found in our previously published, comparably sensitive low-resolution (θ = 8″ FWHM) image covering the same area were also detected at 0.″66 resolution, so most radio sources with S(3 GHz) ≳ 5 μJy have angular structure ϕ ≲ 0.″66. The ratios of peak brightness in the 0.″66 and 3″ images have a distribution indicating that most μJy radio sources are quite compact, with a median Gaussian angular diameter FWHM and an rms scatter σ ϕ ≲ 0.″3 of individual sizes. Most of our μJy radio sources obey the tight far-infrared/radio correlation, indicating that they are powered by star formation. The median effective angular radius enclosing half the light emitted by an exponential disk is , so the median effective radius of star-forming galaxies at redshifts z ∼ 1 is .
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