变脸耀变体B2 1420+326 (OQ 334)中的伽马射线准周期振荡
Gamma-ray Quasi-periodic Oscillations in the Changing Look Blazar B2 1420+326 (OQ 334)
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中文总结 AI 辅助
该研究在变脸耀变体B2 1420+326的费米-拉特光变曲线中探测到周期约10-13天的瞬态准周期振荡,并探讨了其可能的物理机制。
中文摘要 AI 辅助
在费米-拉特(Fermi-LAT)伽马射线光变曲线中,从2026年1月1日至8月25日,我们报告了变脸耀变体B2 1420+326中探测到的周期约为10-13天的瞬态准周期振荡(QPOs)。该源大约在2026年5月7日进入耀发状态,并持续到2026年8月中旬左右,在此期间它表现出强烈的QPO特征。我们使用了标准技术,包括加权小波Z变换分析、广义Lomb-Scargle周期图和相位色散最小化,来搜索并确认这些发现。在耀发之前,该源表现出类似周期性的轻度阻尼振荡特征,阻尼时标约为20天。基于探测到的QPO的周期时标和性质,我们讨论了观测到的显著特征可能的物理机制。
英文摘要
In the Fermi-LAT gamma-ray light curve from January 1 to August 25, 2026, of the changing look blazar B2 1420+326, we report here the detection of transient quasi-periodic oscillations (QPOs) of period ranging around 10-13 d. The source entered the flare state around May 7, 2026, and lasted till around mid-August, 2026 during which it depicted strong QPO signatures. We utilized standard techniques, including weighted wavelet Z-transform analysis, generalized Lomb-Scargle periodogram, and phase dispersion minimization, to search for and confirm these findings. Prior to the flare, the source displayed a mild damped oscillatory feature of similar periodicity with a damping timescale of around 20 d. Based on the period timescale and nature of the QPOs detected, we discuss possible physical mechanisms for the observed salient features.
发表机构
- Aryabhatta Research Institute of Observational Sciences (ARIES)(阿亚巴塔观测科学研究所)
- Indian Institute of Astrophysics(印度天体物理研究所)
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