Two Transient Quasi-periodic Oscillations in γ-Ray Emission from the Blazar S4 0954+658
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...
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| Veröffentlicht in: | The Astrophysical journal 2023-06, Vol.949 (2), p.39 |
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| creator | Gong, Yunlu Tian, Shiting Zhou, Liancheng Yi, Tingfeng Fang, Jun |
| description | 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 >5
σ
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 ∼3.5
σ
, 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. |
| doi_str_mv | 10.3847/1538-4357/acca7b |
| format | Article |
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σ
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 ∼3.5
σ
, 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.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/acca7b</identifier><language>eng</language><publisher>Philadelphia: The American Astronomical Society</publisher><subject>Active galactic nuclei ; Analytical methods ; Astrophysics ; Blazars ; Gamma emission ; Gamma rays ; Jets ; Light curve ; Period search ; Quasi-Periodic Oscillations</subject><ispartof>The Astrophysical journal, 2023-06, Vol.949 (2), p.39</ispartof><rights>2023. The Author(s). Published by the American Astronomical Society.</rights><rights>2023. The Author(s). Published by the American Astronomical Society. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c445t-6ba24296cdff264b45a77f4628b49c913c4ce64f0f689134ac180f018357039c3</citedby><cites>FETCH-LOGICAL-c445t-6ba24296cdff264b45a77f4628b49c913c4ce64f0f689134ac180f018357039c3</cites><orcidid>0000-0001-8043-0745 ; 0000-0003-3326-2173 ; 0000-0001-8920-0073</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/1538-4357/acca7b/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>314,776,780,860,2096,27901,27902,38867,53842</link.rule.ids></links><search><creatorcontrib>Gong, Yunlu</creatorcontrib><creatorcontrib>Tian, Shiting</creatorcontrib><creatorcontrib>Zhou, Liancheng</creatorcontrib><creatorcontrib>Yi, Tingfeng</creatorcontrib><creatorcontrib>Fang, Jun</creatorcontrib><title>Two Transient Quasi-periodic Oscillations in γ-Ray Emission from the Blazar S4 0954+658</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>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 >5
σ
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 ∼3.5
σ
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σ
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 ∼3.5
σ
, 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.</abstract><cop>Philadelphia</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-4357/acca7b</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0001-8043-0745</orcidid><orcidid>https://orcid.org/0000-0003-3326-2173</orcidid><orcidid>https://orcid.org/0000-0001-8920-0073</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Active galactic nuclei Analytical methods Astrophysics Blazars Gamma emission Gamma rays Jets Light curve Period search Quasi-Periodic Oscillations |
| title | Two Transient Quasi-periodic Oscillations in γ-Ray Emission from the Blazar S4 0954+658 |
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