Polarization variability of blazars in the optical emission

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysics and Space Science Pub Date : 2024-04-03 DOI:10.1007/s10509-024-04293-8
Yu-Hai Yuan, Guan-Zhu Ding, Feng-Jie Wu
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Abstract

Polarization studies in blazars are effective tools for analyzing the emission composition and the relativistic jet. In this work, we collected photometric and polarization data from the Steward Observatory Blazar Monitoring Program and performed the following studies. (1) Among the 10 target sources, 8 sources exhibit correlations between the polarization variability (\(P\)) and \(V\)-lightcurves (\(F_{V}\)). (2) When we use the multiorder power law function to fit \(P\) and \(F_{V}\), we obtain several parameters, including the brightening timescale (\(\Delta T_{b}\)) and the dimming timescale (\(\Delta T_{d}\)). In the brightening stage, \(\Delta T_{P|b}\) and \(\Delta T_{F|b}\) were correlated, with a correlation coefficient of \(r=0.45\), and a chance probability of \(p=0.30\%\). In the dimming stage, \(\Delta T_{P|d}\) and \(\Delta T_{F|d}\) exhibited weak correlations. (3) To analyze the origin of the polarization, we study the dependence of polarization on spectral index.

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光学发射中炽星的偏振变化
对炽星的偏振研究是分析发射成分和相对论喷流的有效工具。在这项工作中,我们从Steward天文台的类星体监测计划中收集了测光和偏振数据,并进行了以下研究。(1)在10个目标源中,有8个源的偏振变率(\(P\))和\(V\)-光曲线(\(F_{V}\))之间存在相关性。(2) 当我们使用多阶幂律函数来拟合\(P\)和\(F_{V}\)时,我们得到了几个参数,包括增亮时间尺度(\(\Delta T_{b}\))和减弱时间尺度(\(\Delta T_{d}\))。在变亮阶段,\(\Delta T_{P|b}\)和\(\Delta T_{F|b}\)是相关的,相关系数为\(r=0.45\),概率为\(p=0.30%\)。在调光阶段,\(\Delta T_{P|d}\)和\(\Delta T_{F|d}\)表现出弱相关性。(3) 为了分析极化的起源,我们研究了极化对光谱指数的依赖性。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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