Six-Year Optical Monitoring of the Bl Lacertae Object 1es 0806+52.4

Man, Zhongyi; Zhang, Xiaoyuan; Wu, Jianghua; Xu, Zhiyong; Yuan, Qirong

doi:10.1088/0004-6256/148/6/110

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…This trend has been confirm by a number of authors for different blazars (e.g. Wu et al 2012;Gupta et al 2012;Dai et al 2013;Man et al 2014). The trend, however, may lead to the special color behavior as discussed in the next section.…”

Section: Intra-day Variabilitysupporting

confidence: 74%

Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution

Man¹,

Zhang²,

Wu³

et al. 2016

Mon. Not. R. Astron. Soc.

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We have monitored the BL Lacertae object S5 0716+714 simultaneously in the B, R and I bands on three nights in November 2014. The average time resolution is quite high (73s, 34s, 58s for the filters B, R and I), which can help us trace the profile of the variation and search for the short inter-band time delay. Intra-day variability was about 0.1 mag on the first two nights and more than 0.3 mag on the third. A bluerwhen-brighter color behavior was found. An clear loop path can be seen on the colormagnitude diagram of the third night, revealing possible time delays between variations at high and low energies. It is the first time that the intra-day spectral hysteresis loop has been found so obviously in the optical band. We used the interpolated crosscorrelation function method to further confirm the time delay and calculated the values of lag between light curves at different wavelengths on each night. On the third night, variations in the R and B bands is approximately 1.5 minutes lagging behind the I band. Such optical time delay is probably due to the interplay of different processes of electrons in the jet of the blazar.

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Section: Intra-day Variabilitysupporting

confidence: 74%

Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution

Man¹,

Zhang²,

Wu³

et al. 2016

Mon. Not. R. Astron. Soc.

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“…3FGL J0809.8+5218: This source is a known TeV BL Lac object (Acciari et al 2009) and its long term optical monitoring has been studied by Man et al (2014). They did not find any significant INOV during the period spanned over ∼6 years.…”

Section: Discussion On Individual Sourcesmentioning

confidence: 95%

Intra-night Optical Variability Monitoring of Fermi Blazars: First Results from 1.3 m J. C. Bhattacharya Telescope

Paliya

Stalin

Ajello

et al. 2017

ApJ

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We report the first results obtained from our campaign to characterize the intranight-optical variability (INOV) properties of Fermi detected blazars, using the observations from the recently commissioned 1.3 m J C Bhattacharya telescope (JCBT). During the first run, we were able to observe 17 blazars in the Bessel R filter for ∼137 hrs. Using C and scaled F -statistics, we quantify the extent of INOV and derive the duty cycle (DC) which is the fraction of time during which a source exhibits a substantial flux variability. We find a high DC of 40% for BL Lac objects and the flat spectrum radio quasars are relatively less variable (DC ∼ 15%). However, when estimated for blazars sub-classes, a high DC of ∼59% is found in low synchrotron peaked (LSP) blazars, whereas, intermediate and high synchrotron peaked objects have a low DC of ∼11% and 13%, respectively. We find evidences about the association of the high amplitude INOV with the γ-ray flaring state. We also notice a high polarization during the elevated INOV states (for the sources that have polarimetric data available), thus supporting the jet based origin of the observed variability. We plan to enlarge the sample and utilize the time availability from the small telescopes, such as 1.3 m JCBT, to strengthen/verify the results obtained in this work and those existed in the literature.

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“…Gopal-Krishna et al (2011) monitored this blazar on 4 nights but didn't find IDV on any night. Quasi-simultaneous multicolor observations of 1ES 0806+524 were performed from 2005 December to 2011 February by Man et al (2014) and they found a strong BWB trend on long timescales, but no variation on IDV timescales.…”

Section: Introductionmentioning

confidence: 99%

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

Pandey

Gupta

Kurtanidze

et al. 2020

ApJ

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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 eighteen 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 (V RI) spectral energy distributions of 1ES 0806+524. We discuss different possible mechanisms responsible for blazar variability on diverse timescales.

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Six-Year Optical Monitoring of the Bl Lacertae Object 1es 0806+52.4

Cited by 3 publications

References 48 publications

Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution

Simultaneous optical monitoring of BL Lacertae object S5 0716+714 with high temporal resolution

Intra-night Optical Variability Monitoring of Fermi Blazars: First Results from 1.3 m J. C. Bhattacharya Telescope

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

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