C 120, BL Lacertae, and OJ 287: Coordinated Optical, Infrared, and Radio Observations of Intraday Variability.

Citations Over TimeTop 21% of 1972 papers

Abstract

Simultaneous optical, infrared, and radio observations were made to search for intraday (time- scale 24h) variability of the radiation from 3C 120, BL Lac, and OJ 287, sources known to be active at both radio and optical wavelengths on time scales of days or longer. Optical interday (timescale > 24h) variability was found for all three sources. The finding of optical intraday variability for BL Lac verified earlier results. The 3.5-mm data strongly suggest intraday variations of OJ 287 with amplitudes as large as 40 percent. The infrared data for OJ 287 show variability of 25 percent on one night but show no correlation with the 3.5-mm data. Interested observers are invited to participate in further coordinated searches scheduled for 1972 December 2/3-8/9 (BL Lac and 3C 120) and 1973 February 1/2-7/8 (OJ 287).

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