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

Li, Xiaopan; Yang, Haiyan; Cai, Yan; Song, X. Y.; Yang, Hai-Tao; Shan, Yu-Qiong

doi:10.1088/1674-4527/ace091

Cited by 2 publications

(1 citation statement)

References 79 publications

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“…For example, the QPO of PKS 0607-157 in the radio band [7] and PKS 0405-385 in the γ-ray light curve [8]. Month-like QPOs can be explained by the helical structure in the jet [9].…”

Section: Introductionmentioning

confidence: 99%

Optical Quasi-Periodic Oscillation of Blazar PKS 1440-389 in the TESS Light Curve

Lu,

Yi,

Tang

et al. 2024

Universe

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We report the results of time series analysis of blazar PKS 1440-389, observed by the Transiting Exoplanet Survey Satellite (TESS) in two sectors. We find that the source has a quasi-periodic oscillation (QPO) of about 3.1 days for sector 11 and around 3.7 days for sector 38 in the optical band. We use two methods to assess the QPO and its confidence level: Lomb–Scargle periodogram and weighted wavelet Z-transforms. We explore various potential explanations for these rapid quasi-periodic variations and propose that their source most likely resides within the innermost region of the accretion disk. Within this framework, we estimate the mass of the central black hole of this blazar. We obtain black hole masses of 6.65 × 108M⊙ (Schwarzschild black hole) and 4.22 × 109M⊙ (maximally rotating Kerr black hole), with a main period of 3.7 days. Finally, we utilize the kink instability model to explain the QPO.

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“…For example, the QPO of PKS 0607-157 in the radio band [7] and PKS 0405-385 in the γ-ray light curve [8]. Month-like QPOs can be explained by the helical structure in the jet [9].…”

Section: Introductionmentioning

confidence: 99%

Optical Quasi-Periodic Oscillation of Blazar PKS 1440-389 in the TESS Light Curve

Lu,

Yi,

Tang

et al. 2024

Universe

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A radio quasi-periodic oscillation in the blazar PKS J2156−0037

Mao,

Zhang

2024

Monthly Notices of the Royal Astronomical Society

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The detection of quasi-periodic oscillations (QPOs) in blazar light curves is crucial for understanding their nature and fundamental physical processes. PKS J2156−0037 (z = 0.495), a blazar monitored by the Owens Valley Radio Observatory (OVRO) 40-m radio telescope, is the subject of this study. We searched for the presence of QPOs in the publicly available 15 GHz light curve of PKS J2156−0037, spanning 2008 January to 2020 January. We employed four well-established methods (the Jurkevich method, the generalized Lomb–Scargle periodogram, the weighted wavelet Z–transform, and the REDFIT method) that offer complementary strengths for robust periodicity detection. A consistent and statistically significant QPO signal was detected with a periodicity of around 611 d (at least 4.26σ local significance) and a global significance exceeding 99.83 per cent (or 2.92σ) based on Monte Carlo simulations with 105 simulated light curves (assuming underlying red noise processes). This is the first reported detection of such a variability feature in this object. The possible physical mechanisms responsible for radio QPOs in blazars are discussed briefly.

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

Cited by 2 publications

References 79 publications

Optical Quasi-Periodic Oscillation of Blazar PKS 1440-389 in the TESS Light Curve

Optical Quasi-Periodic Oscillation of Blazar PKS 1440-389 in the TESS Light Curve

A radio quasi-periodic oscillation in the blazar PKS J2156−0037

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