Long-term BVR I monitoring of PKS 2155-304 finds significant multi-timescale variability, spectral hardening, a 2023 flare, weak optical-X-ray correlations, and no significant short-term quasi-periodicity once red noise is modelled.
Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714
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abstract
In this paper, we report results of our near-infrared (NIR) photometric variability studies of the BL Lacertae object S5 0716+714. NIR photometric observations spread over 7 nights during our observing run April 2-9, 2007 at 1.8 meter telescope equipped with KASINICS (Korea Astronomy and Space Science Institute Near Infrared Camera System) and J, H, and Ks filters at Bohyunsan Optical Astronomy Observatory (BOAO), South Korea. We searched for intra-day variability, short term variability and color variability in the BL Lac object. We have not detected any genuine intra-day variability in any of J, H, and Ks passbands in our observing run. Significant short term variability ~ 32.6%, 20.5% and 18.2% have been detected in J, H, Ks passbands, respectively, and ~ 11.9% in (J-H) color.
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PKS 2155-304: Long-Term Optical Photometric Monitoring and Variability Analysis
Long-term BVR I monitoring of PKS 2155-304 finds significant multi-timescale variability, spectral hardening, a 2023 flare, weak optical-X-ray correlations, and no significant short-term quasi-periodicity once red noise is modelled.