论文标题
PKS的多波长变化现象0735+178在不同的时间尺度上
Multi-wavelength Variation Phenomena of PKS 0735+178 on Diverse Timescale
论文作者
论文摘要
Bl Lac对象PKS 0735+178在先前的研究中显示出一些复杂的多波长变化现象，尤其是其颜色行为。发现蓝光的蓝光，红色的布莱特和成年行为都是PKS 0735+178的长期趋势。在这项工作中，我们收集了PKS 0735+178的长期多波长数据，并在日内时间表上进行了多色光学监测。在一晚上检测到盘中的变异性。从长时间的时间尺度上，在$ r $和$γ$ ray乐队之间发现了可能的22天时间滞后。互相关分析的结果在盘中和长时间尺度上都表现出强烈的相关性。但是，在长期$γ$ ray和$ r $ band光曲线之间仅发现了一个温和的相关性，这可以通过$γ$ ray和光学排放的不同排放机制来解释。 PKS 0735+178在$γ$ -Ray频段中表现出明显的艰难时期，这与长期和日内时间表上观察到的光蓝光趋势时观察到的光学蓝光趋势是一致的。我们发现，在活跃状态下，特别是对于历史低国家，HWB和BWB趋势将得到增强。这种现象表明PKS 0735+178的特殊活动依赖性颜色行为，并且可以通过喷射发射模型对其进行很好的解释。
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 $γ$-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 $γ$-ray and $R$-band light curves, which could be interpreted by the different emission mechanisms of the $γ$-ray and optical emissions. PKS 0735+178 showed a significant harder-when-brighter in the $γ$-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.
