Optical variability of the TeV blazar 1ES 0806+524 on diverse timescales
We report the results of our optical (VRI) photometric observations of the TeV blazar 1ES 0806+524 on 153 nights during 2011-2019 using seven optical telescopes in Europe and Asia. We investigated the variability of the blazar on intraday as well as on long-term timescales. We examined 18 intraday l...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2020 February 13
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| In: |
The astrophysical journal
Year: 2020, Jahrgang: 890, Heft: 1 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ab698e |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4357/ab698e
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| Verfasserangaben: | Ashwani Pandey, Alok C. Gupta, Sofia O. Kurtanidze, Paul J. Wiita, G. Damljanovic, R. Bachev, Jin Zhang, O.M. Kurtanidze, A. Darriba, R.A. Chigladze, G. Latev, M.G. Nikolashvili, S. Peneva, E. Semkov, A. Strigachev, S.N. Tiwari, and O. Vince |
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| 520 | |a We report the results of our optical (VRI) photometric observations of the TeV blazar 1ES 0806+524 on 153 nights during 2011-2019 using seven optical telescopes in Europe and Asia. We investigated the variability of the blazar on intraday as well as on long-term timescales. We examined 18 intraday light curves for flux and color variations using the most reliable power-enhanced F-test and the nested ANOVA test. Only on one night was a small, but significant, variation found, in both V-band and R-band light curves. The V−R color index was constant on every one of those nights. Flux density changes of around 80% were seen over the course of these eight years in multiple bands. We found a weighted mean optical spectral index of 0.639 ± 0.002 during our monitoring period by fitting a power law () in 23 optical (VRI) spectral energy distributions of 1ES 0806+524. We discuss different possible mechanisms responsible for blazar variability on diverse timescales. | ||
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