Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..673t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 673-710
Astronomy and Astrophysics
Astrophysics
64
Active Galactic Nuclei, Bl Lacertae Objects, Quasars, Radio Observation, Statistical Correlation, Variability, Visual Observation, Astronomical Photometry, Data Correlation, Light Curve, Radiant Flux Density, Submillimeter Waves
Scientific paper
We have studied flux variations in the optical and at radio wavelengths of a sample of extragalactic sources. Even though similar analyses have been done ealier, this is the first extensive study of connections between long-term optical and high ratio frequency (from 22 GHz up to 230 GHz) variability in a large sample (22 sources) of active galactic nuclei (AGN). For the correlation analysis we used the discrete correlation function complemented by visual comparison and concentrated on finding correlations with time delays of about 1000 days and less, since any time delays longer than some hundred days are very hard to verify. In 10 out of the 22 sources we found a clear radio-optical correlation, and in as many as 6 sources the optical and high frequency radio variability was simultaneous. We suggest that the main reason for not finding significant correlations in the rest of the sample sources is the lack of sufficient radio and especially optical data.
Clements Sandra Denise
Leacock Robert J.
Nair Achotham Damodaran
Smith Alex. G.
Terasranta Harri
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