AO 0235+164: rapid flux variations caused by relativistic aberration effects

被引：0
|
作者：
Qian, SJ
Kraus, A
Witzel, A
Krichbaum, TP
Zensus, JA
机构：
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[2] Beijing Astron Observ, Natl Astron Observ, Beijing 100012, Peoples R China
来源：
ASTRONOMY & ASTROPHYSICS | 2000年 / 357卷 / 01期
关键词：
radio continuum : galaxies; radiation mechanisms : non-thermal; galaxies : BL Lacertae objects : individual : AO 0235+164;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
An unusual event of rapid flux density variations (with a timescale of similar to 4 days) observed at 1.49, 4.86 and 8.44 GHz in the highly variable BL Lac object AO 0235+164 is analysed. The distinct properties of the burst are: (I) the flux density reached its maximum at 1.49 GHz earlier than at 4.86 and 8.44 GHz; (2) the duration of the burst decreased with decreasing frequency; (3) the variability amplitude increased with decreasing frequency. This behaviour is different from that of normal radio outbursts in blazars and cannot be explained easily with known models. We investigate the spectral evolution of the burst and suggest that the burst may be caused by relativistic aberration effects when a thin-shock moves with a large Lorentz factor (Gamma greater than or similar to 25) along slightly curved magnetic field lines in the jet.
引用
收藏
页码：84 / 90
页数：7
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