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- W4285735858 abstract "BL Lac object PKS 0735+178 showed some complex multi-wavelength variation phenomena in the previous studies, especially for its color behavior. Bluer-when-brighter, redder-when-brighter and achromatic behavior were all found to be possible long-term trends of PKS 0735+178. In this work, we collected the long-term multi-wavelength data of PKS 0735+178, and also performed a multi-color optical monitoring on intraday timescale. The intraday variability was detected on one night. On the long timescale, a possible 22-day time lag was found between the $R$ and $gamma$-ray bands. The results of the cross-correlation analysis exhibited strong correlations between various optical bands on both intraday and long timescale. However, only a mild correlation was found between the long-term $gamma$-ray and $R$-band light curves, which could be interpreted by the different emission mechanisms of the $gamma$-ray and optical emissions. PKS 0735+178 showed a significant harder-when-brighter in the $gamma$-ray band, which is consistent with the observed optical bluer-when-brighter trend on both long-term and intraday timescales. We found that the HWB and BWB trends will be enhanced during the active states, especially for the historical low state. Such phenomenon indicates a special activity-dependent color behavior of PKS 0735+178, and it could be well interpreted by the jet emission model." @default.
- W4285735858 created "2022-07-18" @default.
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- W4285735858 date "2022-07-01" @default.
- W4285735858 modified "2023-10-14" @default.
- W4285735858 title "Multiwavelength Variation Phenomena of PKS 0735+178 on Diverse Timescales" @default.
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- W4285735858 doi "https://doi.org/10.3847/1538-4357/ac7647" @default.
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