The Optical Variability of 3C345

Details The Optical Variability of 3C345 The Optical Variability of 3C345

Sep 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970ap%26ss...8..471s&link_type=abstract

Astrophysics and Space Science, Volume 8, Issue 3, pp.471-477

Astronomy and Astrophysics

Astrophysics

25

Scientific paper

Photographic observations of the quasar 3C345 during 1968 and 1969 are reported. They show a quiescent state during 1968 and renewed activity in 1969. Fourier analysis of all available brightness measurements 1965 69 shows a dominant long-term variation with an apparent period of 1025 d, and two weak components with periods of 165 d and 556 d. There are no conspicuous short-period components down to 10 d. The light-curve synthesized from these three components does not fully represent the rapid variations, but does suggest a period of 165 d for the optical spikes, which is probably related to the periods of 80 d and 320 d suggested earlier.

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