Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales

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; O. Vince

doi:10.3847/1538-4357/ab698e

Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales

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, O. Vince

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

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 (F ν ∝ ν^-α) in 23 optical (VRI) spectral energy distributions of 1ES 0806+524. We discuss different possible mechanisms responsible for blazar variability on diverse timescales.

Original language	English
Article number	72
Journal	Astrophysical Journal
Volume	890
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab698e
Publication status	Published - 10 Feb 2020
Externally published	Yes

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Pandey, A., Gupta, A. C., Kurtanidze, S. O., Wiita, P. J., Damljanovic, G., Bachev, R., Zhang, J., Kurtanidze, O. M., Darriba, A., Chigladze, R. A., Latev, G., Nikolashvili, M. G., Peneva, S., Semkov, E., Strigachev, A., Tiwari, S. N., & Vince, O. (2020). Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales. Astrophysical Journal, 890(1), Article 72. https://doi.org/10.3847/1538-4357/ab698e

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title = "Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales",

abstract = "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 (F ν ∝ ν-α) in 23 optical (VRI) spectral energy distributions of 1ES 0806+524. We discuss different possible mechanisms responsible for blazar variability on diverse timescales.",

author = "Ashwani Pandey and Gupta, {Alok C.} and Kurtanidze, {Sofia O.} and Wiita, {Paul J.} and G. Damljanovic and R. Bachev and Jin Zhang and Kurtanidze, {O. M.} and A. Darriba and Chigladze, {R. A.} and G. Latev and Nikolashvili, {M. G.} and S. Peneva and E. Semkov and A. Strigachev and Tiwari, {S. N.} and O. Vince",

year = "2020",

month = feb,

day = "10",

doi = "10.3847/1538-4357/ab698e",

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Pandey, A, Gupta, AC, Kurtanidze, SO, Wiita, PJ, Damljanovic, G, Bachev, R, Zhang, J, Kurtanidze, OM, Darriba, A, Chigladze, RA, Latev, G, Nikolashvili, MG, Peneva, S, Semkov, E, Strigachev, A, Tiwari, SN & Vince, O 2020, 'Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales', Astrophysical Journal, vol. 890, no. 1, 72. https://doi.org/10.3847/1538-4357/ab698e

TY - JOUR

T1 - Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales

AU - Pandey, Ashwani

AU - Gupta, Alok C.

AU - Kurtanidze, Sofia O.

AU - Wiita, Paul J.

AU - Damljanovic, G.

AU - Bachev, R.

AU - Zhang, Jin

AU - Kurtanidze, O. M.

AU - Darriba, A.

AU - Chigladze, R. A.

AU - Latev, G.

AU - Nikolashvili, M. G.

AU - Peneva, S.

AU - Semkov, E.

AU - Strigachev, A.

AU - Tiwari, S. N.

AU - Vince, O.

PY - 2020/2/10

Y1 - 2020/2/10

N2 - 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 (F ν ∝ ν-α) in 23 optical (VRI) spectral energy distributions of 1ES 0806+524. We discuss different possible mechanisms responsible for blazar variability on diverse timescales.

AB - 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 (F ν ∝ ν-α) 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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SN - 0004-637X

VL - 890

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 72

ER -

Optical Variability of the TeV Blazar 1ES 0806+524 on Diverse Timescales

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