OPTICAL IDENTIFICATION OF 3C 48, 3C 196, AND 3C 286 WITH STELLAR OBJECTS
OWENS VALLEY RADIO OBSERVATORY PASADENA CA
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Radio positions of the three sources were deter mined with the two 90-ft antennas working as an interferometer with an rms accuracy in both coordinates better than 10 sec of arc. Direct photographs show that a star-like object exists within the error rectangle at each of the source positions. Exceedingly faint wisps of nebulosity are associated with the stars in 3C 48 and 3C 196. The observations are incomplete for 3C 286 in this regard. Photoelectric photometry of the stars shows each to have quite peculiar color indices, most closely resembling the colors of old novae, or possibly white dwarfs, but the authors are not suggesting identification with these types of stars. Optical spectra for 3C 48 show several very broad emission features. It is shown that the radiant flux in the optical region can be computed from the radio flux data and the theory of synchrotron radiation for 3C 48 and 3C 196, but not for 3C 286. This, together with other arguments, suggests that the optical as well as the radio flux could be due to the synchrotron mechanism, but the arguments are not conclusive.