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The Detection of Possible Quasiperiodic Oscillations in the BL Lac 4FGL J2139.4−4235

dc.contributor.authorYunlu Gong
dc.contributor.authorQuangui Gao
dc.contributor.authorXiaopan Li
dc.contributor.authorMin Yuan
dc.contributor.authorTingfeng Yi
dc.contributor.authorHuaizhen Li
dc.contributor.authorLonghua Qin
dc.contributor.authorHaitao Yang
dc.contributor.authorHaiyan Yang
dc.contributor.authorPengfei Zhang
dc.contributor.authorJun Fang
dc.contributor.authorLi Zhang
dc.contributor.otherDepartment of Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; lizhang@ynu.edu.cn, fangjun@ynu.edu.cn
dc.contributor.otherDepartment of Physics, Yuxi Normal University , Yuxi 653100, People's Republic of China ; qggao@yxnu.edu.cn
dc.contributor.otherCollege of Physics and Information Engineering, Zhaotong University , Zhaotong 657000, People's Republic of China
dc.contributor.otherSchool of Mathematics and Statistics, Xianyang Normal University , Xianyang 712000, People's Republic of China
dc.contributor.otherPhysics Department, Yunnan Normal University , Kunming 650092, People's Republic of China
dc.contributor.otherDepartment of Physics, Yuxi Normal University , Yuxi 653100, People's Republic of China ; qggao@yxnu.edu.cn
dc.contributor.otherDepartment of Physics, Yuxi Normal University , Yuxi 653100, People's Republic of China ; qggao@yxnu.edu.cn
dc.contributor.otherCollege of Physics and Information Engineering, Zhaotong University , Zhaotong 657000, People's Republic of China
dc.contributor.otherCollege of Physics and Information Engineering, Zhaotong University , Zhaotong 657000, People's Republic of China
dc.contributor.otherDepartment of Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; lizhang@ynu.edu.cn, fangjun@ynu.edu.cn
dc.contributor.otherDepartment of Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; lizhang@ynu.edu.cn, fangjun@ynu.edu.cn
dc.contributor.otherDepartment of Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; lizhang@ynu.edu.cn, fangjun@ynu.edu.cn
dc.date.accessioned2025-10-09T04:39:06Z
dc.date.available2025-10-09T04:39:06Z
dc.date.issued01-01-2024
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad83ca
dc.identifier.urihttp://digilib.fisipol.ugm.ac.id/repo/handle/15717717/40746
dc.description.abstractWe present periodicity search analyses on the long-term γ -ray light curve of the BL Lacertae object 4FGL J2139.4−4235 observed by the Fermi Large Area Telescope, over a period of more than 15 yr, from 2008 August 4 to 2023 December 10. To determine the quasiperiodic oscillation (QPO) behavior of 4FGL J2139.4−4235 in the 0.3–300 GeV energy range, we used four methods, namely the Lomb–Scargle periodogram, the weighted wavelet z-transform, the phase dispersion minimization, and the autoregressive integrated moving average model. A Monte Carlo simulation technique is used to evaluate the significance level of the QPO signal. Significant levels above 3.5 σ were detected in the γ -ray light curve at about 650 days QPO, which is presented throughout the observation period. Interestingly, there was some correlation between the three bands in the discrete correlation function method calculations, which may be an indication that the variability trends between the three bands are similar. We explore the possible physical models and show that a supermassive binary black hole system or a jet helical motion model seem to be reasonable explanations for the potential QPO behavior.
dc.language.isoEN
dc.publisherIOP Publishing
dc.subject.lccAstrophysics
dc.titleThe Detection of Possible Quasiperiodic Oscillations in the BL Lac 4FGL J2139.4−4235
dc.typeArticle
dc.description.keywordsActive galaxies
dc.description.keywordsBL Lacertae objects
dc.description.keywordsAstronomy data analysis
dc.description.keywordsPeriod search
dc.description.doi10.3847/1538-4357/ad83ca
dc.title.journalThe Astrophysical Journal
dc.identifier.e-issn1538-4357
dc.identifier.oaioai:doaj.org/journal:b78f61f5bc844a1fb77110d0a4ea19f8
dc.journal.infoVolume 976, Issue 1


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