The correlation between radio and optical variations in OJ 287

Details The correlation between radio and optical variations in OJ 287 The correlation between radio and optical variations in OJ 287

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184...57v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 57-62.

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Bl Lacertae Objects, Millimeter Waves, Optical Waveguides, Radio Frequencies, Radio Sources (Astronomy), Computational Astrophysics, Cross Correlation

Scientific paper

The correlation between optical and radio variations in the BL Lac object OJ 287 is studied with five different radio frequencies in the range of 4.8 to 37 GHz. The authors use both higher frequencies (22 and 37 GHz) and more extensive data sets than in previous analyses of similar kind. The optical variations are found to precede the radio ones by less than one year. The time delay is proportional to wavelength at least in lower frequencies. Above 10 GHz the optical-radio time delay may be constant, about two months. The correlation exists both for small events during as quiescent period and for the post-1982 active phase of OJ 287. The authors also consider the alternative that there may be two different delays at millimeter wavelengths.

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