An efficient search for gravitationally lensed radio lobes

We performed an automated comparison of the FIRST radio survey with the Aut omatic Plate Measuring (APM) optical catalog to find radio lobes with optic al counterparts. Based on an initial survey covering similar to 3000 deg(2) , we selected a sample of 33 lens candidates for VLA confirmation. VLA and optical observations of these candidates yielded two lens systems, one a ne w discovery (J0816+5003) and one that was previously known (J1549+3047). Tw o other candidates have radio lobes with galaxies superposed but lack evide nce of multiple imaging. One of our targets (J0958+2947) is a projected clo se pair of quasars (8" separation at redshifts 2.064 and 2.744). Our search method is highly efficient, with greater than 5% of our observing targets being lensed, compared to the usual success rate of less than 1%. Using the whole FIRST survey, we expect to find five to 10 lenses in short order usi ng this approach, and the sample could increase to hundreds of lensed lobes in the northern sky, using deeper optical surveys and planned upgrades to the VLA. Such a sample would be a powerful probe of galaxy structure and ev olution.