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We analyze the radio light curve of 3C 273 at 15 GHz from 1963 to 2006 taken from the database of the literature, and find evidence of quasi-periodic activity. Using the wavelet analysis method to analyze these data, our results indicate that: (1) There is one main outburst period of P1=8.1±0.1 year in 3C 273. This period is in a good agreement with Ozernoi’s analysis in optical bands. (2) Based on...
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