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

Aryabhatta Research Institute of Observational Sciences
Deen Dayal Upadhyay Gorakhpur University India
Abastumani Observatory
Heidelberg University
Samtskhe-Javakheti State University
College of New Jersey
University of Belgrade
Bulgarian Academy of Sciences
CAS - National Astronomical Observatories
Kazan Volga Region Federal University
Guangzhou University
American Association of Variable Star Observers
Centro Astronómico de Avila

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

13 Citations (Scopus)

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

@article{c2e3e06b696c469c9a7be3c838d10562,

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",

language = "English",

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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.

UR - https://www.scopus.com/pages/publications/85081556400

U2 - 10.3847/1538-4357/ab698e

DO - 10.3847/1538-4357/ab698e

M3 - Article

AN - SCOPUS:85081556400

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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