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

Li, Xiao-Pan; Cai, Yan; Yang, Haiyan; Lähteenmäki, A.; Tornikoski, M.; Tammi, J.; Suutarinen, Sofia; Yang, Hai-Tao; Luo, Yong; Wang, Lisha

doi:10.1093/mnras/stad008

Cited by 4 publications

(2 citation statements)

References 90 publications

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“…In such a scenario, taking the spin parameter a s = 0.9 and the BH mass M = 2.3 × 10 8 M e (Becerra González et al 2021), the timescale of the two QPOs places the emission region in the range from 10 to 15 r g . Because the accretion disks are warped, the QPO phenomenon could be the result of jet precession, therefore resulting in a period of thousands of years (Bhatta 2018;Liska et al 2018;Li et al 2023). Such a long timescale does not seem to apply to this case.…”

Section: Conclusion and Discussionmentioning

confidence: 97%

Two Transient Quasi-periodic Oscillations in γ-Ray Emission from the Blazar S4 0954+658

Gong

Tian

Zhou

et al. 2023

ApJ

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In this work, we report periodicity search analyses in the gamma-ray light curve of the blazar S4 0954+658 in monitoring undertaken by the Fermi Large Area Telescope. Four analytical methods and a tool are adopted to detect any periodic flux modulation and corresponding significance level, revealing: (i) a quasi-periodic oscillation (QPO) of 66 days with a significance level of >5σ spanning over 600 days from 2015 to 2016 (MJD 57,145–57,745), resulting in continuous observation of nine cycles, which is one of the longest cycles discerned in blazar gamma-ray light curves; (ii) a possible QPO of 210 days at a moderate significance of ∼3.5σ, which lasted for over 880 days from 2020 to 2022 (MJD 59,035–59,915) and for four cycles. In addition, we discuss several physical models to explain the origin of the two transient QPOs and conclude that a geometrical scenario involving a plasma blob moving helically inside the jet can explain the timescale of the QPO.

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Section: Conclusion and Discussionmentioning

confidence: 97%

Two Transient Quasi-periodic Oscillations in γ-Ray Emission from the Blazar S4 0954+658

Gong

Tian

Zhou

et al. 2023

ApJ

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“…The PSRESP model has been frequently utilized to define PSDs of AGN periodograms using Monte Carlo simulations (e.g., Chatterjee et al 2008;Max-Moerbeck et al 2014;Bhatta et al 2016;Ait Benkhali et al 2020;Bhatta 2021;Goyal et al 2022;Li et al 2023a). In order to evaluate which model PSD has the highest likelihood of accurately representing the source PSD, the binned source periodogram is fitted with a variety of model PSDs with test parameters.…”

Section: Power Spectral Density Analysismentioning

confidence: 99%

A Quasi-periodic Oscillation of ∼4.6 yr in the Radio Light Curves of Blazar PKS 0607-157

Yang

Cai

et al. 2023

Res. Astron. Astrophys.

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We present periodicity search analyses on the long-term radio light curves at 4.8, 8, and 14.5 GHz of the blazar PKS 0607–157 observed by the University of Michigan Radio Astronomical Observatory (UMRAO) telescope. The highly variable radio emissions are approximately distributed as a log-normal probability distribution function. The Power Spectral Density for the radio light curves can be well characterized by a power-law model. Using the Weighted Wavelet Z-transform and Lomb-Scargle periodogram methods, significant Quasi-periodic Oscillation (QPO) of ~4.6 years in the radio light curve has been observed above the 3σ confidence level, which presents an interesting case among blazar QPO phenomena. We explore three plausible physical models to explain the observed QPOs: a supermassive binary black hole (SMBBH) system, Lense–Thirring precession of the disk and helical motion of plasma blobs within the jet.

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Transient quasi-periodic oscillations in the gamma-ray light curves of bright blazars

Chen,

Yu,

Huang

et al. 2024

Monthly Notices of the Royal Astronomical Society

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Transient quasi-periodic oscillations (QPOs) are extremely interesting observational phenomena. However, the precise physical mechanisms leading to their generation are still hotly debated. We performed a systematic search for transient QPO signals using Weighted Wavelet Z-transforms on the gamma-ray light curves of 134 bright blazars with peak flux exceeding 1 × 10−6 ph cm−2 s−1 as monitored by Fermi-LAT. Artificial light curves were generated from the power spectral density and probability distribution functions of the original light curves to assess the significance level of transient QPO. We discuss several physical mechanisms that produce transient QPOs, with the helical jet model providing the best explanation. This study identified four new transient QPO events. Interestingly, repetitive transient QPOs are observed in PKS 0537-441, and nested transient QPOs are detected in PKS 1424−41. Additionally, we find that transient QPOs tend to occur in the flare state of the blazar. Finally, we estimate the incidence of transient QPO events to be only about 3 per cent.

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

Cited by 4 publications

References 90 publications

Two Transient Quasi-periodic Oscillations in γ-Ray Emission from the Blazar S4 0954+658

Two Transient Quasi-periodic Oscillations in γ-Ray Emission from the Blazar S4 0954+658

A Quasi-periodic Oscillation of ∼4.6 yr in the Radio Light Curves of Blazar PKS 0607-157

Transient quasi-periodic oscillations in the gamma-ray light curves of bright blazars

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