The Radio/Optical Catalog of the SSA 13 Field

We present a 1.4-GHz catalog of 810 radio sources (560 sources in thecomplete sample) with 1.8" resolution found within a 17' radius in the SSA13field (RA=13h12m,DEC=42d38'). The radio image from the VLA has an rms noiselevel of 4.82 microJy/beam at the field center, and Subaru optical images inr-band (6300A) and z-band (9200A) have a three-sigma detection magnitude of26.1 and 24.9, respectively. 88% of the radio sources are identified with anoptical counterpart, and there is significantly more reddening for objectsfainter than 24-mag. The radio and optical parameters are tabulated, and sourcemorphologies are displayed by radio contours overlaying optical false-colorimages. The radio structures show a wealth of complexity and these areclassified into a small number of categories. About one-third of the radiosources are larger than 1.2" and their orientation is often similar to that ofthe associated galaxy or binary-galaxy system. The density of sources in theSSA13 field above 75 microJy is 0.40 per square arcmin, with a slope of -2.43in the differential counts. The radio spectral index may steepen for sourcesbelow 75 microJy. We estimate that at most 40% of the microJansky radio sourcesare dominated by AGN processes.Comment: 50 pages, 14 figures of which fig 6 contains 33 parts. In press, Astrophysical Journal, Supp