| Title: | Periodic gamma-ray modulation of the blazar PG 1553+113 confirmed by Fermi-LAT and multiwavelength observations |
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| Authors: | ID Abdollahi, S. (Author)
ID Baldini, L. (Author)
ID Barbiellini, G. (Author)
ID Bellazzini, R. (Author)
ID Berenji, B. (Author)
ID Bissaldi, E. (Author)
ID Blandford, R. D. (Author)
ID Bonino, R. (Author)
ID Bruel, P. (Author)
ID Zaharijas, Gabrijela (Author), et al. |
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| Files: |  https://iopscience.iop.org/article/10.3847/1538-4357/ad64c5
 Abdollahi_2024_ApJ_976_203.pdf (2,22 MB)
MD5: 2BE6FF0BA33450A6F978E075DE9B43C0
https://iopscience.iop.org/article/10.3847/1538-4357/ad64c5
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Abstract
A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in ∼7 yr of data from the Fermi Large Area Telescope. After 15 yr of Fermi sky-survey observations, doubling the total time range, we report >7 cycle gamma-ray modulation with an estimated significance of 4σ against stochastic red noise. Independent determinations of oscillation period and phase in the earlier and the new data are in close agreement (chance probability <0.01). Pulse timing over the full light curve is also consistent with a coherent periodicity. Multiwavelength new data from Swift X-Ray Telescope, Burst Alert Telescope, and UVOT, and from KAIT, Catalina Sky Survey, All-Sky Automated Survey for Supernovae, and Owens Valley Radio Observatory ground-based observatories as well as archival Rossi X-Ray Timing Explorer satellite-All Sky Monitor data, published optical data of Tuorla, and optical historical Harvard plates data are included in our work. Optical and radio light curves show clear correlations with the gamma-ray modulation, possibly with a nonconstant time lag for the radio flux. We interpret the gamma-ray periodicity as possibly arising from a pulsational accretion flow in a sub-parsec binary supermassive black hole system of elevated mass ratio, with orbital modulation of the supplied material and energy in the jet. Other astrophysical scenarios introduced include instabilities, disk and jet precession, rotation or nutation, and perturbations by massive stars or intermediate-mass black holes in polar orbit. |
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| Keywords: | gamma rays, AGNs |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.01.2024 |
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| Year of publishing: | 2024 |
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| Number of pages: | str. 1-18 |
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| Numbering: | Vol. 976, no. 2, [article no.] 203 |
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| PID: | 20.500.12556/RUNG-9765  |
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| COBISS.SI-ID: | 222101763 |
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| ISSN: | 0004-637X |
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| UDC: | 52 |
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| ISSN on article: | 1538-4357 |
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| eISSN: | 1538-4357 |
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| DOI: | 10.3847/1538-4357/ad64c5 |
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| NUK URN: | URN:SI:UNG:REP:ZMC4CPDT |
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| Publication date in RUNG: | 13.01.2025 |
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| Views: | 263 |
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| Downloads: | 6 |
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