Revisiting radio variability of the blazar 3C 454.3
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909428345733120 |
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| author | Tripathi, Ashutosh Gupta, Alok C. Smith, Krista Lynne Wiita, Paul J. Aller, Margo F. Volvach, Alexandr E. Lähteenmäki, Anne Aller, Hugh D. Tornikoski, Merja Volvach, Larisa N. |
| author_facet | Tripathi, Ashutosh Gupta, Alok C. Smith, Krista Lynne Wiita, Paul J. Aller, Margo F. Volvach, Alexandr E. Lähteenmäki, Anne Aller, Hugh D. Tornikoski, Merja Volvach, Larisa N. |
| contents | We examine lengthy radio light curves of the flat spectrum radio galaxy 3C 454.3 for possible quasi-periodic oscillations (QPOs). The data used in this work were collected at five radio frequencies, 4.8, 8.0, 14.5, 22.0, and 37.0 GHz between 1979--2013 as observed at the University of Michigan Radio Astronomical Observatory, Crimean Astrophysical Observatory, and Aalto University Mets{ä}hovi Radio Observatory. We employ generalized Lomb-Scargle periodogram and weighted wavelet transform analyses to search for periodicities in these light curves. We confirm a QPO period of $\sim$ 2000 day to be at least 4$σ$ significant using both methods at all five radio frequencies between 1979 and 2007, after which a strong flare changed the character of the light curve. We also find a $\sim$~600 day period which is at least 4$σ$ significant, but only in the 22.0 and 37.0 GHz light curves. We briefly discuss physical mechanisms capable of producing such variations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_10771 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Revisiting radio variability of the blazar 3C 454.3 Tripathi, Ashutosh Gupta, Alok C. Smith, Krista Lynne Wiita, Paul J. Aller, Margo F. Volvach, Alexandr E. Lähteenmäki, Anne Aller, Hugh D. Tornikoski, Merja Volvach, Larisa N. High Energy Astrophysical Phenomena We examine lengthy radio light curves of the flat spectrum radio galaxy 3C 454.3 for possible quasi-periodic oscillations (QPOs). The data used in this work were collected at five radio frequencies, 4.8, 8.0, 14.5, 22.0, and 37.0 GHz between 1979--2013 as observed at the University of Michigan Radio Astronomical Observatory, Crimean Astrophysical Observatory, and Aalto University Mets{ä}hovi Radio Observatory. We employ generalized Lomb-Scargle periodogram and weighted wavelet transform analyses to search for periodicities in these light curves. We confirm a QPO period of $\sim$ 2000 day to be at least 4$σ$ significant using both methods at all five radio frequencies between 1979 and 2007, after which a strong flare changed the character of the light curve. We also find a $\sim$~600 day period which is at least 4$σ$ significant, but only in the 22.0 and 37.0 GHz light curves. We briefly discuss physical mechanisms capable of producing such variations. |
| title | Revisiting radio variability of the blazar 3C 454.3 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2412.10771 |