Compact Radio Source in the Nucleus of M87

The compact radio source in M87 has been observed with a long-base-line interferometer composed of the 210-foot telescope at Goldstone, California, and the 85-foot telescope at Tidbinbila, near Can- berra, Australia. The observations suggest that the radio source is remarkably concentrated to the galactic nucleus and has a linear diameter of about 3 light-months