Periodicity in the BL Lac object OJ287


Short-term variations in luminosity provide the best upper limits for the sizes of active galactic nuclei. Periodicity provides further information on the geometrical, dynamical and physical models of these regions. The best candidates for the study of such variations are the so-called blazars (optically violently variable (OVV) objects and BL Lac objects… (More)
DOI: 10.1038/314146a0


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