HIGH-REDSHIFT ACTIVE GALACTIC NUCLEI FROM THE 1-JY CATALOG AND THE MAGNIFICATION BIAS

We have found a statistically significant (99.1%) excess of red (O - E > 2) galaxies with photographic magnitudes E < 19.5, O < 21 taken fro m the APM Sky Catalog around z similar to 1 radio sources from the 1 J y catalog. The amplitude, scale, and dependence on galaxy colors of th e observed overdensity are consistent with their being a result of the magnification bias caused by the weak gravitational lensing of large- scale structures at redshifts z approximate to 0.2-0.4 and are very di fficult to explain by such other causes as, e.g., obscuration by dust.