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<p>We present optical monitoring of the BL Lac object 1ES 0806+524 using the 1.26&#xa0;m National Astronomical Observatory-Guangzhou University Infrared/Optical telescope (NGT) on 13 nights from 22 February to 1 October 2023. We use several methods to analyse the intraday optical variability (IDV), reporting a faint IDV result on one night, and find a maximum magnitude variation of 0.101 ± 0.045 in 35.583 minutes. We analyse the relation between spectral indices (<InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math> <mi>α</mi> </math></EquationSource> <EquationSource Format="TEX">$\alpha $</EquationSource> </InlineEquation>) and flux densities (<InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math> <msub> <mi>F</mi> <mi mathvariant="italic">gri</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$F_{\mathit{gri}}$</EquationSource> </InlineEquation>) on several timescales. On a short-term timescale, the linear correlation between spectral indices and flux densities is weak. A redder-when-brighter (RWB) trend is observed in the <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math> <mi mathvariant="italic">i</mi> </math></EquationSource> <EquationSource Format="TEX">$\mathit{i}$</EquationSource> </InlineEquation> band on an intraday timescale, differing from the typical bluer-when-brighter (BWB) behaviour reported in previous long-term studies. Furthermore, we find complex behaviour, including clockwise and anticlockwise loops, possibly related to electron acceleration and cooling processes in the jet. Time evolution of colour is found on one night, which may be caused by magnetic reconnection. These results provide new insights into the emission from the jet of 1ES 0806+524 in the optical regime.</p>

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Optical monitoring and variability analysis of the blazar 1ES 0806+524

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • W. X. Liu,
  • Q. Z. Zhang,
  • Y. H. Yuan

摘要

We present optical monitoring of the BL Lac object 1ES 0806+524 using the 1.26 m National Astronomical Observatory-Guangzhou University Infrared/Optical telescope (NGT) on 13 nights from 22 February to 1 October 2023. We use several methods to analyse the intraday optical variability (IDV), reporting a faint IDV result on one night, and find a maximum magnitude variation of 0.101 ± 0.045 in 35.583 minutes. We analyse the relation between spectral indices ( α $\alpha $ ) and flux densities ( F gri $F_{\mathit{gri}}$ ) on several timescales. On a short-term timescale, the linear correlation between spectral indices and flux densities is weak. A redder-when-brighter (RWB) trend is observed in the i $\mathit{i}$ band on an intraday timescale, differing from the typical bluer-when-brighter (BWB) behaviour reported in previous long-term studies. Furthermore, we find complex behaviour, including clockwise and anticlockwise loops, possibly related to electron acceleration and cooling processes in the jet. Time evolution of colour is found on one night, which may be caused by magnetic reconnection. These results provide new insights into the emission from the jet of 1ES 0806+524 in the optical regime.