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Optical variability and colour behaviour of 3C 345
Wu, Jianghua; Zhou, Xu; Ma, Jun; Jiang, Zhaoji
2011-12-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号418期号:3页码:1640-1648
摘要The colour behaviour of blazars is a subject of much debate. One argument is that the BL Lac objects show bluer-when-brighter chromatism while the flat-spectrum radio quasars (FSRQs) display a redder-when-brighter trend. Based on a 3.5-year three-colour monitoring programme, we studied the optical variability and colour behaviour of one FSRQ, 3C 345. There is at least one outburst in this period. The overall variation amplitude is 2.640 mag in the i band. Intranight variability was observed on two nights. The bluer-when-brighter and redder-when-brighter chromatisms were simultaneously observed in this object when using different pairs of passbands to compute the colours. The bluer-when-brighter chromatism is a shared property with the BL Lacs, while the redder-when-brighter trend is likely due to two less variable emission features, the Mg ii line and the blue bump, at short wavelengths. With numerical simulations, we show that some other strong but less variable emission lines in the spectrum of FSRQs may also significantly alter their colour behaviour. Then the colour behaviour of an FSRQ is linked not only to the emission process in the relativistic jet, but also to the redshift, the passbands used for computing the colour and the strengths of the less variable emission features relative to the strength of the non-thermal continuum.
关键词Galaxies: Active Quasars: Individual: 3c 345
DOI10.1111/j.1365-2966.2011.19565.x
收录类别SCI
语种英语
WOS记录号WOS:000298088000015
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8048
专题光学天文研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
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Wu, Jianghua,Zhou, Xu,Ma, Jun,et al. Optical variability and colour behaviour of 3C 345[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,418(3):1640-1648.
APA Wu, Jianghua,Zhou, Xu,Ma, Jun,&Jiang, Zhaoji.(2011).Optical variability and colour behaviour of 3C 345.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,418(3),1640-1648.
MLA Wu, Jianghua,et al."Optical variability and colour behaviour of 3C 345".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 418.3(2011):1640-1648.
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