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Results of a Long-Term Optical Variability Study of 11 Quasars and VRI Photometry of Comparison Stars

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2024)

European Southern Observ | Bulgarian Acad Sci

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Abstract
We present the results of a 15-yr long-term optical monitoring of 11 quasars conducted with the 2-m Ritchey-Chretien-Coude and the 50/70 cm Schmidt telescopes at the Rozhen National Astronomical Observatory, Bulgaria. Our observations are performed with standard Johnson-Cousins $VRI$ band filters and for each quasar we present a set of comparison standard stars that can be used for monitoring of objects in these fields (including finding charts for the stars identification). The variability and periodicity of each quasar are analysed individually and discussed. The physical properties of each quasar, such as their classification, redshift, and radio structures, are also discussed based on previous literature. Damped random walk model shows the best or the second best fit to the light curves of all objects. However, in six cases periodic models provide comparably good fits and make these six objects a valuable addition to the growing sample of quasars with periodic flux variation. They will be suitable for further investigation of the hitherto unclear mechanisms that give rise to this variability pattern. Our results provide important insights into the long-term variability and physical properties of quasars, which can further deepen our understanding of the nature and evolution of active galaxy nuclei.
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quasars: supermassive black holes,galaxies: photometry
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要点】:本文通过对11个类星体进行长达15年的光学监测,分析了它们的变异性及周期性,提出了阻尼随机游走模型和周期模型在类星体光变曲线拟合中的有效性,为研究活动星系核的性质和演化提供了重要见解。

方法】:研究使用了标准的Johnson-Cousins $VRI$波段滤镜,在保加利亚Rozhen国家天文台的2米Ritchey-Chretien-Coude和50/70厘米Schmidt望远镜上进行观测。

实验】:经过15年的观测,实验分析了每个类星体的变异性与周期性,并基于先前的文献讨论了它们的物理属性,如分类、红移和射电结构;研究结果显示阻尼随机游走模型为大多数类星体光变曲线提供了最佳或次佳拟合,而六个类星体的光变曲线则显示出了周期性特征,为探究光变机制提供了新的样本。