Abstract
We report a ∼6.1 yr quasi-periodicity for the blazar S5 0716+714 using the radio light curves at 4.8, 8 and 14.5 GHz observed by the University of Michigan Radio Astronomical Observatory (UMRAO) from 1981 to 2012, by means of the Jurkevich, discrete correlation function (DCF) and power spectral analysis techniques. There are a general correlation among light curves at different frequencies and a time lag of \(170\pm 10\) days between 4.8 and 14.5 GHz light curves can be confirmed. We also estimate the orbit parameters assuming a binary black hole system, and the magnetic field strength under the jet comoving frame.
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Acknowledgements
This research is supported by the Science Research Project of Education Department of Yunnan Province, China (2017ZZX079, 2016ZZX230), and the Youth Program of the Applied Basic Research Projects of Yunnan Province, China (2017FD147). We are very grateful to Dr. Margo Aller for providing the UMRAO data. This research has made use of data from the University of Michigan Radio Astronomy Observatory, which is supported by the University of Michigan and by a series of grants from the National Science Foundation, most recently AST-0607523, and NASA Fermi grants NNX09AU16G, NNX10AP16G, and NNX11AO13G.
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Li, XP., Luo, YH., Yang, HY. et al. Radio variability of the blazar S5 0716+714: a ∼6.1 year quasi-periodicity. Astrophys Space Sci 363, 169 (2018). https://doi.org/10.1007/s10509-018-3391-1
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DOI: https://doi.org/10.1007/s10509-018-3391-1