Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray
We performed variability analysis of the multiwavelength light curves (LCs) for the flat-spectrum radio quasar PKS 0727-11. Using the generalized Lomb–Scargle periodogram, we identified a possible quasiperiodic oscillation (QPO) of ~168.6 days (persisted for six cycles, with a significance of 3.8 σ...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ada775 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1823860999642415104 |
|---|---|
| author | Yuncai Shen Tingfeng Yi Vinit Dhiman Lisheng Mao Liang Dong |
| author_facet | Yuncai Shen Tingfeng Yi Vinit Dhiman Lisheng Mao Liang Dong |
| author_sort | Yuncai Shen |
| collection | DOAJ |
| description | We performed variability analysis of the multiwavelength light curves (LCs) for the flat-spectrum radio quasar PKS 0727-11. Using the generalized Lomb–Scargle periodogram, we identified a possible quasiperiodic oscillation (QPO) of ~168.6 days (persisted for six cycles, with a significance of 3.8 σ ) in the γ -ray LC during the flare period (MJD 54687–55738). It is the first time that periodic variations have been detected in this source, and further supported by other methods: weighted wavelet z -transform, phase dispersion minimization, REDFIT, autoregressive integrated moving average model, and structure function analysis. Cross-correlation analysis shows that there is a strong correlation between multiband light variations, indicating that γ -ray and radio flares may originate from the same disturbance, and the distance between the emission regions of γ -ray and radio flares is calculated based on the time lag. We demonstrate that QPO arising from the non-ballistic helical jet motion driven by the orbital motion in a supermassive binary black hole is a plausible physical explanation. In this scenario, the estimated mass of the primary black hole is M ∼ 3.66 × 10 ^8 –5.79 × 10 ^9 M _⊙ . |
| format | Article |
| id | doaj-art-f45f739e17f546a385e0bb8e2a38bffa |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-f45f739e17f546a385e0bb8e2a38bffa2025-02-10T07:56:48ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980115310.3847/1538-4357/ada775Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-RayYuncai Shen0Tingfeng Yi1https://orcid.org/0000-0001-8920-0073Vinit Dhiman2Lisheng Mao3https://orcid.org/0000-0002-2720-3604Liang Dong4Key Laboratory of Colleges and Universities in Yunnan Province for High-energy Astrophysics, Department of Physics, Yunnan Normal University , Kunming 650500, People’s Republic of China ; yitingfeng@ynnu.edu.cnKey Laboratory of Colleges and Universities in Yunnan Province for High-energy Astrophysics, Department of Physics, Yunnan Normal University , Kunming 650500, People’s Republic of China ; yitingfeng@ynnu.edu.cn; Yunnan Province China-Malaysia HF-VHF Advanced Radio, Astronomy Technology International Joint Laboratory, Yunnan Observatories , Chinese Academy of Sciences, Kunming 650011, People’s Republic of China; Guangxi Key Laboratory for the Relativistic Astrophysics, Guangxi University , Nanning 530004, People’s Republic of ChinaDepartment of Astronomy, School of Physics and Astronomy, Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University , Kunming 650091, People’s Republic of ChinaKey Laboratory of Colleges and Universities in Yunnan Province for High-energy Astrophysics, Department of Physics, Yunnan Normal University , Kunming 650500, People’s Republic of China ; yitingfeng@ynnu.edu.cnYunnan Province China-Malaysia HF-VHF Advanced Radio, Astronomy Technology International Joint Laboratory, Yunnan Observatories , Chinese Academy of Sciences, Kunming 650011, People’s Republic of ChinaWe performed variability analysis of the multiwavelength light curves (LCs) for the flat-spectrum radio quasar PKS 0727-11. Using the generalized Lomb–Scargle periodogram, we identified a possible quasiperiodic oscillation (QPO) of ~168.6 days (persisted for six cycles, with a significance of 3.8 σ ) in the γ -ray LC during the flare period (MJD 54687–55738). It is the first time that periodic variations have been detected in this source, and further supported by other methods: weighted wavelet z -transform, phase dispersion minimization, REDFIT, autoregressive integrated moving average model, and structure function analysis. Cross-correlation analysis shows that there is a strong correlation between multiband light variations, indicating that γ -ray and radio flares may originate from the same disturbance, and the distance between the emission regions of γ -ray and radio flares is calculated based on the time lag. We demonstrate that QPO arising from the non-ballistic helical jet motion driven by the orbital motion in a supermassive binary black hole is a plausible physical explanation. In this scenario, the estimated mass of the primary black hole is M ∼ 3.66 × 10 ^8 –5.79 × 10 ^9 M _⊙ .https://doi.org/10.3847/1538-4357/ada775BlazarsFlat-spectrum radio quasars |
| spellingShingle | Yuncai Shen Tingfeng Yi Vinit Dhiman Lisheng Mao Liang Dong Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray The Astrophysical Journal Blazars Flat-spectrum radio quasars |
| title | Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray |
| title_full | Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray |
| title_fullStr | Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray |
| title_full_unstemmed | Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray |
| title_short | Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray |
| title_sort | multiwavelength variability analysis of the blazar pks 0727 11 an 168 day quasiperiodic oscillation in the γ ray |
| topic | Blazars Flat-spectrum radio quasars |
| url | https://doi.org/10.3847/1538-4357/ada775 |
| work_keys_str_mv | AT yuncaishen multiwavelengthvariabilityanalysisoftheblazarpks072711an168dayquasiperiodicoscillationinthegray AT tingfengyi multiwavelengthvariabilityanalysisoftheblazarpks072711an168dayquasiperiodicoscillationinthegray AT vinitdhiman multiwavelengthvariabilityanalysisoftheblazarpks072711an168dayquasiperiodicoscillationinthegray AT lishengmao multiwavelengthvariabilityanalysisoftheblazarpks072711an168dayquasiperiodicoscillationinthegray AT liangdong multiwavelengthvariabilityanalysisoftheblazarpks072711an168dayquasiperiodicoscillationinthegray |