利用TESS重新研究耀变体PKS 0735+178的中微子事件时期
Revisiting neutrino event epochs for the blazar PKS 0735+178 with TESS
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中文总结 AI 辅助
本文利用TESS观测耀变体PKS 0735+178的周级耀发，分析其光学光变特性，探讨该源光学变异性与同期中微子事件的可能关联，为其光学流量行为提出物理场景。
中文摘要 AI 辅助
本文呈现了对耀变体PKS 0735+178的光学光变曲线变异性分析结果，该源处于周级耀发状态，由凌日系外行星巡天卫星（Transiting Exoplanet Survey Satellite，TESS）在三个扇区中观测获得。本研究中的TESS观测与一个知名的中微子发射阶段重合，该阶段由四个不同的中微子天文台在窄时间窗口内的多个时期探测到。我们将耀发的上升段和衰减段进行分段，分别分析了它们的流量分布、超额方差、变时标和功率谱密度（power spectral density，PSD）。该源表现出约25%的升高的超额方差，具有多模态流量分布（上升段相干，衰减段畸变）。变时标分析显示衰减时标远快于上升时标，且功率谱密度呈现出功率谱斜率的名义变化。我们讨论了光学变异性与中微子事件之间可能存在的联系，并结合先前发现的射电波段结果简要解释了观测到的光学流量行为的可能物理场景。
英文摘要
We present here the results of the optical light curve variability analysis of the blazars PKS 0735+178, in weeks-scale flare state, observed in three sectors with the Transiting Exoplanet Survey Satellite (TESS). The TESS observations in this study coincide with a well-known neutrino emission phase detected with four different neutrino observatories at multiple epochs in a narrow time window. We segmented the rising and decaying parts of the flare and individually analyzed their flux distribution, excess variance, variability timescale, and the power spectral density (PSD). The source displayed an elevated excess variance of ~25%, with a multi-modal flux distribution (coherent in the rising and distorted in the decaying phase). The variability timescale analysis highlights a much faster decay than the rising scale, and the PSDs depict a nominal change in the power spectral slope. We discuss a likely connection in the optical variations and the neutrino events, and briefly explain a possible physical scenario for the observed optical flux behavior in view of previously discovered radio-band results.
