Abstract
We report the detection of quasi-periodic oscillations (QPOs) in the radio light curve of the blazar PKS 1510-089 spanning nearly 38 years, by means of the weighted wavelet Z-transform and Lomb–Scargle periodogram methods. Prominent QPOs with high confidence (>4\(\sigma \)) of \(570\pm 30\), \(800\pm 30,\) and \(1070\pm 40\) days in the 8 GHz light curve, \(430\pm 10\) and \(1080\pm 30\) days in the 14.5 GHz light curve have been identified after estimating the significance against the red noise background. Moreover, the most significant QPO of about 1080 days exceeded \(4 \sigma \) confidence level at two of the three frequencies but did not exactly persist the whole observations, indicating that QPOs in blazars are transient in nature. We suggest that the search for QPO in blazar light curves should evaluate the statistical significances and consider the influences of the colored noise, after reviewing earlier QPO claims of PKS 1510-089.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (11903028), the Fundamental Research Plan of Yunnan Province, China (2017FD147), and the Science Research Project of Zhaotong University, China (2018xj04). 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 was supported by the University of Michigan and by a series of Grants from the National Science Foundation, most recently AST-0607523, and NASA Fermi Grant Nos NNX09AU16G, NNX10AP16G, and NNX11AO13G.
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Li, XP., Zhao, L., Yan, Y. et al. Detection of quasi-periodic oscillations from the blazar PKS 1510-089. J Astrophys Astron 42, 92 (2021). https://doi.org/10.1007/s12036-021-09773-9
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DOI: https://doi.org/10.1007/s12036-021-09773-9