论文标题
$γ$ - 射线光线核的准周期振荡
Quasi-periodic oscillations in the $γ$-ray light curves of bright active galactic nuclei
论文作者
论文摘要
在活性银河核（AGN）的光曲线中检测准周期振荡（QPO）可以提供对这些系统供电的超质量黑洞（SMBHS）物理学的见解，并可以代表SMBH二元组的存在的签名，并在SMBH Binaries的存在中存在基本的约束，从而在SmbH smbh vessece neccy nescee nocee nocee nocese nocese nocese nocese nockece nocese nocese vessece incocee nocese nocese nockece nocese nocese nocese nocese vesse nocese vesse nocese nocese vesse nocese。长期QPO的识别，其特征是以几个月到几年的阶段为特征，这特别具有挑战性，只能通过提供无偏见的，连续的天体物理物体的光曲线来实现。 Fermi-Lat卫星由于其监视观察策略，是这样一个目标的理想工具。在这里，我们旨在识别费米 - 拉特目录中最明亮的AGN的$γ$ ray灯库中的QPO。我们分析了35个最亮的费米 - 拉特AGN的光曲线，包括从费米任务开始（2008年8月）到2021年4月的数据，其能量从100 meV到300 GEV。研究了7天和30天的两次binnings。然后使用连续小波变换对准周期特征进行搜索。通过具有相同功率谱密度和概率分布功能与原始光曲线的人造光曲线的蒙特卡洛模拟对结果的重要性进行了测试。然后，将其在查看效果的效果中纠正，并作为后审判提供。我们用候选QPO确定了24种类星体。我们的几个候选人与文献中先前的主张相吻合，即：PKS 0537-441，S5 0716+714，MRK 421，B2 1520+31和PKS 2247-131。我们所有的候选人都是短暂的。在类星体S5 1044+71中观察到了最重要的多年QPO，大约1100天。这是第一次在这里报告。
The detection of quasi-periodic oscillations (QPOs) in the light curves of active galactic nuclei (AGNs) can provide insights into the physics of the super-massive black-holes (SMBHs) powering these systems and could represent a signature of the existence of SMBH binaries, setting fundamental constraints on SMBH evolution in the Universe. The identification of long term QPOs, characterized by periods on the order of several months to years, is particularly challenging and can only be achieved via all-sky monitoring instruments that provide unbiased, continuous light-curves of astrophysical objects. The Fermi-LAT satellite, thanks to its monitoring observing strategy, is an ideal instrument for such a goal. Here, we aim to identify QPOs in the $γ$-ray light-curves of the brightest AGNs within the Fermi-LAT catalog. We analyzed the light curves of the 35 brightest Fermi-LAT AGNs, including data from the beginning of the Fermi mission (August 2008) to April 2021, with energies from 100 MeV to 300 GeV. Two time binnings were investigated, 7 and 30 days. The search for quasi-periodic features was then performed using the continuous wavelet transform. The significance of the result was tested via Monte Carlo simulations of artificial light curves with the same power spectral density and probability distribution function as the original light curves. The significances were then corrected for the look-elsewhere effect and provided as post-trials. We identified 24 quasars with candidate QPOs. Several of our candidates coincide with previous claims in the literature, namely: PKS 0537-441, S5 0716+714, Mrk 421, B2 1520+31, and PKS 2247-131. All our candidates are transient. The most significant multi-year QPO, with a period of about 1100 days, was observed in the quasar S5 1044+71. It is reported here for the first time.
