2005/11/24 by N. A. Kudryavtseva, T. B. Pyatunina · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Radioactive Decay and Measurement Techniques #astro-ph
paper · pdf · doi:10.1134/s106377290601001x
published as Astron.Rep.50:1-11,2006 · 27 pages, 11 figures, accepted for publication in Astronomy Reports
arxiv created 2005/11/24 · openalex publication_date 2006/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present an analysis of multifrequency light curves of the sources 2223-052 (3C 446), 2230+114 (CTA 102), and 2251+158 (3C 454.3), which had shown evidence of quasiperiodic activity. The analysis made use of data from the University of Michigan Radio Astronomy Observatory (USA) at 4.8, 8, and 14.5 GHz, as well as the Metsahovi Radio Astronomy Observatory (Finland) at 22 and 37 GHz. Application of two different methods (the discrete autocorrelation function and the method of Jurkevich) both revealed evidence for periodicity in the flux variations of these sources at essentially all frequencies. The periods derived for at least two of the sources—2223-052 and 2251+158—are in good agreement with the time interval between the appearance of successive VLBI components. The derived periods for 2251+158 ( P = 12.4 yr and 2223-052 ( P = 5.8 yr) coincide with the periods found earlier by other authors based on optical light curves.