On the Light Variations of Seyfert Galaxy 3C120

Details On the Light Variations of Seyfert Galaxy 3C120 On the Light Variations of Seyfert Galaxy 3C120

Mar 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971ap%26ss..10..402j&link_type=abstract

Astrophysics and Space Science, Volume 10, Issue 3, pp.402-410

Astronomy and Astrophysics

Astrophysics

17

Scientific paper

The fragmentary light-curve of the Seyfert galaxy 3C120, based on photometry of the bestavailable Harvard plates of the past 60 yr, has been subjected to a periodicity analysis using a method (Appendix) particularly suited to this type of irregularly-spaced data. The analysis yields convincing evidence for a period of about 350 d and some indication of a longer period of about 22.5 yr. The observational data often depart appreciably from the light curve synthesized from the two periodic components. In one comparatively well-documented segment (1934 1939), the agreement between observational data and the synthesized model improves if it is assumed that a pair of oppositelydirected phase shifts have occurred, disturbing the 350-day period and then causing it to recover.

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