Quasi-periodic behaviour in the radio and gamma-ray light curves of blazar PKS 1510-089

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-03
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
4893-4901
Series
Monthly Notices of the Royal Astronomical Society, Volume 519, issue 4
Abstract
We explore the possible quasi-periodic oscillations (QPOs) of the blazar PKS 1510−089, utilizing the ∼38-yr Metsähovi flux density observations at 37 GHz and over 10-yr Fermi Large Area Telescope observations in the 0.1–300 GeV energy range. Both the flux distributions of the radio and γ-ray light curves suggest a lognormal distribution, and power spectral densities of both light curves can be well represented by a bending power-law model. Comparing the results from the weighted wavelet Z-transform and Lomb–Scargle periodogram approaches, a quasi-period of 1330 ± 55 d at a 99.80 per cent (>3σ) significance against the red noise background is observed in the radio light curve, whereas no similar modulation is seen in the γ-ray light curve. We briefly discuss the research actuality of blazar QPO phenomena and explain the observed radio QPO as the result of Keplerian motion in a supermassive binary black hole system and periodic modulation induced by the Lense–Thirring precession of the innermost portions of theaccretion disc.
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Keywords
BL Lacertae objects: general, BL Lacertae objects: individual: PKS 1510-089, Galaxies: active
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Citation
Li , XP , Cai , Y , Yang , HY , Lahteenmaki , A , Tornikoski , M , Tammi , J , Suutarinen , S , Yang , H-T , Luo , YH & Wang , LS 2023 , ' Quasi-periodic behaviour in the radio and gamma-ray light curves of blazar PKS 1510-089 ' , Monthly Notices of the Royal Astronomical Society , vol. 519 , no. 4 , pp. 4893-4901 . https://doi.org/10.1093/mnras/stad008