• Detection of quasi-periodic oscillations from the blazar PKS 1510-089

• # Fulltext

https://www.ias.ac.in/article/fulltext/joaa/042/0092

• # Keywords

BL Lacertae objects: general; BL Lacertae objects: individual: PKS 1510-089; method: time-series analysis.

• # 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 theinfluences of the colored noise, after reviewing earlier QPO claims of PKS 1510-089.

• # Author Affiliations

1. College of Physics and Information Engineering, Zhaotong University, Zhaotong 657000, China.
2. Faculty of Civil Engineering and Mechanics/Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China.

• # Journal of Astrophysics and Astronomy

Volume 44, 2023
All articles
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