Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81..489p&link_type=abstract
Astronomical Journal, vol. 81, July 1976, p. 489-499.
Astronomy and Astrophysics
Astronomy
62
Cross Correlation, Extragalactic Radio Sources, Light Emission, Radiant Flux Density, Secular Variations, Astronomical Models, Data Correlation, Light Sources, Long Term Effects
Scientific paper
For the first time, long-term records of radio and optical fluxes of a large sample of variable extragalactic sources have been assembled and compared, with linear cross-correlation analysis being used to reinforce the visual comparisons. Only in the case of the BL Lac object OJ 287 is the correlation between radio and optical records strong. In the majority of cases there is no evidence of significant correlation, although nine sources show limited or weak evidence of correlation. The results do not support naive extrapolation of the expanding source model. The general absence of strong correlation between the radio and optical regions has important implications for the energetics of events occurring in such sources.
Dent William A.
Edwards Philip
Leacock Robert J.
Olsson C. N.
Pollock Joseph T.
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