WWZ Analysis on the Variability Data of Quasar 3C 345

Details WWZ Analysis on the Variability Data of Quasar 3C 345 WWZ Analysis on the Variability Data of Quasar 3C 345

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cha%26a..34..357d&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 34, Issue 4, p. 357-366.

Astronomy and Astrophysics

Astrophysics

Scientific paper

A new method to analyze unevenly-spaced data is described. It is based on the principle of wavelet analysis and called the weighted wavelet Z-transform (WWZ). Rather complete optical B-band data of the quasar 3C 345 in more than 100 years are collected to obtain its long-term light curve. With the WWZ method, the variability data from 1965 to 1992 are analyzed. The result shows that the data contain 3 periodical components, in which the periodicity of T = 4.54 ˜ 5.23 yr and T = 9.59 ˜ 11.51 yr is steady, while T = 624 ˜ 941 d is not a steady period.

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