Milliarcsecond Core Size Dependence of the Radio Variability of Blazars
Milliarcsecond Core Size Dependence of the Radio Variability of Blazars
复制标题
耀变体射电变异性的毫角秒核心尺寸依赖性
DOI：
10.1017/s1743921323000777
复制
发表时间：
2022
期刊：
影响因子：
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通讯作者：
H. Vedantham
中科院分区：
文献类型：
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作者：
Po;Jun Yi Koay;S. Matsushita;C. Hwang;T. Hovatta;S. Kiehlmann;W. Max;Tim Pearson;A. Readhead;R. Reeves;H. Vedantham
摘要研究耀变体射电变化的时间尺度从几个月到几年提供了信息的亚秒差距尺度结构的喷流，和中央活动星系核的物理。在这项研究中，我们专注于通过欧文斯谷射电天文台Blazar监测计划在15 GHz观测到的1158个blazar的射电变率，这些源已经被观察到大约每周两次超过十年。我们调查的变异幅度和时间尺度的依赖性，使用一个简单的模型拟合的结构功能，上毫角秒射电核心尺寸测量甚长基线干涉。最紧凑的源表现出更大的变化幅度和更短的变化时间尺度比更广泛的来源，这可以解释的光旅行时间的影响。
Abstract Studying blazar radio variability on timescales ranging from months to years provides information on the sub-parsec-scale structures of the jets, and the physics of the central active galactic nuclei. In this study, we focus on the radio variability of 1158 blazars observed at 15 GHz through the Owens Valley Radio Observatory Blazar Monitoring Program, where these sources have been observed about twice a week for over a decade. We investigate the dependence of the variability amplitudes and timescales, derived using a simple model fit to the structure function, on the milliarcsecond radio core sizes measured by Very Long Baseline Interferometry. The most compact sources exhibit larger variability amplitudes and shorter variability timescales than the more extended sources; this could be explained by light travel-time effects.