Revisiting Quasi-periodic Modulation in γ-Ray Blazar PKS 2155-304 with Fermi Pass 8 Data

Zhang, Peng-Fei; Yan, Dahai; Liao, Neng-Hui; Wang, Jiancheng

doi:10.3847/1538-4357/835/2/260

Cited by 64 publications

(40 citation statements)

References 32 publications

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“…Possible γ-ray QPOs have been reported for several blazars (e.g., Sandrinelli et al 2014;Ackermann et al 2015;Sandrinelli et al 2016aSandrinelli et al , 2016bSandrinelli et al , 2017Zhang et al 2017aZhang et al , 2017b. However, the significance of the claimed QPOs is not very high.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…In PKS 2155-304, the periods of optical and γ-ray quasi-periodic variabilities are different (Sandrinelli et al 2014). In PKS 0426-380, no optical quasi-periodic variability is found (Zhang et al 2017b). The lack of optical and X-ray quasi-periodic variabilities may be because the optical/X-ray and γ-ray emissions originate from different regions.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…blazar emission model in which optical, X-ray, and γ-ray emissions are assumed to be produced in the same region (Zhang et al 2017b). …”

Section: Summary and Discussionmentioning

confidence: 99%

“…So far, the Large Area Telescope (LAT; Atwood et al 2009) on board Fermi has collected gamma-rays for over 8 years. The possible quasiperiodic variabilities of blazars with periods of ∼2-3 yr have been reported in γ-ray fluxes of several blazars (e.g., Sandrinelli et al 2014;Ackermann et al 2015;Sandrinelli et al 2016aSandrinelli et al , 2016bSandrinelli et al , 2017Zhang et al 2017aZhang et al , 2017b. In particular, PKS 2155-304 has been reported to have a significance of ∼4σ (Zhang et al 2017b).…”

Section: Introductionmentioning

confidence: 99%

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A γ-ray Quasi-periodic Modulation in the Blazar PKS 0301–243?

Zhang

Yan

Zhou

et al. 2017

ApJ

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We report a nominally high-confidence γ-ray quasi-periodic modulation in the blazar PKS 0301-243. For this target, we analyze its Fermi-LAT Pass 8 data from 2008 August to 2017 May. Two techniques, i.e., maximum likelihood optimization and exposure-weighted aperture photometry, are used to build the γ-ray light curves. Then, both the Lomb-Scargle periodogram and the weighted wavelet Z-transform are applied to the light curves to search for period signals. A quasi-periodicity with a period of 2.1±0.3 yr appears at the significance level of s5 , although it should be noted that this putative quasi-period variability is seen in a data set that is barely four times longer. We speculate that this γ-ray quasi-periodic modulation may be evidence of a binary supermassive black hole.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Summary and Discussionmentioning

confidence: 99%

“…blazar emission model in which optical, X-ray, and γ-ray emissions are assumed to be produced in the same region (Zhang et al 2017b). …”

Section: Summary and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A γ-ray Quasi-periodic Modulation in the Blazar PKS 0301–243?

Zhang

Yan

Zhou

et al. 2017

ApJ

Self Cite

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“…However, in AGNs, the periodicity is relatively rare. Some detections or evidences for periodic variabilities in optical, X-ray, and/or gamma-ray emission of AGN have been reported in the literature (Kidger et al 1992;Valtonen et al 2006;Ackermann et al 2015;Reis et al 2012;Zhang et al 2017a;Covino et al 2017). In X-rays, a significant transient QPO has been detected in NLS1 galaxy RE J1034+396 (Gierliński et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Two Transient X-Ray Quasi-periodic Oscillations Separated by an Intermediate State in 1H 0707-495

Zhang

Liao

et al. 2018

ApJ

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In the narrow-line Seyfert 1 galaxy 1H 0707-495, recently a transient quasi-periodic oscillation (QPO) signal with a frequency of ∼ 2.6 × 10 −4 Hz has been detected at a high statistical significance. Here, we reanalyze the same set of XMM-Newton data observed on 2008 February 4 with the WeightedWavelet Z-transform (WWZ) method. In addition to confirming the previous findings, we also find another QPO signal with a frequency of ∼ 1.2 × 10 −4 Hz in a separated X-ray emission phase at the significance level of ∼ 3.7σ. The signal is also found fitting an auto-regressive model though at a lower significance. The frequency ratio between these two signals is ∼ 2 : 1. The analysis of other XMMNewton measurements of 1H 0707-495 also reveals the presence of the ∼ 2.6 × 10 −4 Hz (∼ 1.2 × 10 −4Hz) QPO signal on 2007 May 14 (2010 September 17) at the significance level of ∼ 4.2σ (∼ 3.5σ). The QPO frequency found in this work follows the f QP O − M BH relation reported in previous works spanning from stellar-mass to supermassive black holes. This is the first time to observe two separated transient X-ray QPO signals in active galactic nuclei (AGNs), which sheds new light on the physics of accreting supermassive black holes.

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Detection of quasi‐periodic oscillations in γ‐ray and optical light curves of the BL Lac 4FGL J0650.7 + 2503

Gong

Yang

et al. 2021

Astron Nachr

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In this work, we have assembled the long-term variability data of the blazar 4FGL J0650.7 + 2503 in the γ-ray and the optical bands, spanning about 11.9 and 8.6 years, respectively. The light curves are then analyzed by using Lomb-Scargle Periodogram, Weighted Wavelet Z-transform, Jurkevich and discrete correlation function techniques, and the results reveal two possible timescales of quasi-periodic oscillation: 500 ± 37 days for γ-ray and 330 ± 20 days for optical.To explore the origin of the γ-ray, we investigated between the optical and γ-ray band correlations, and found that the correlation between the two bands is very significant. This correlation can be reasonably explained by the lepton self-synchro-Compton model. Based on the supermassive binary black hole system model, we estimate the primary black hole mass M ∼ 8.5 × 10 8 M ⊙ .

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Revisiting Quasi-periodic Modulation in γ-Ray Blazar PKS 2155-304 with Fermi Pass 8 Data

Cited by 64 publications

References 32 publications

A γ-ray Quasi-periodic Modulation in the Blazar PKS 0301–243?

A γ-ray Quasi-periodic Modulation in the Blazar PKS 0301–243?

Two Transient X-Ray Quasi-periodic Oscillations Separated by an Intermediate State in 1H 0707-495

Detection of quasi‐periodic oscillations in γ‐ray and optical light curves of the BL Lac 4FGL J0650.7 + 2503

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