Long-term optical and radio variability analysis of BL Lacertae 2200+420
Long-term optical and radio variability analysis of BL Lacertae 2200+420
复制标题
DOI：
10.1007/s11433-013-5310-3
复制
发表时间：
2014-01
期刊：
影响因子：
--
通讯作者：
Hongtao Wang
中科院分区：
文献类型：
--
作者：
Hongtao Wang
基于Metsahovi观测计划的22 GHz和37 GHz射电光变曲线，以及已发表的BVRI波段的光学光变曲线和“全球Blazar望远镜”（WEBT）档案，采用离散相关方法分析了BL Lacertae的22 GHz、37 GHz和光学波段（B、V、R、I）之间的时间延迟。结果表明，22 GHz、37 GHz和光学波段（B、V、R、I）之间存在较强的零滞后相关性。37 GHz比R频段落后11个月。研究了BVRI波段间亮度和色指数的相关性以及37 ~ 22 GHz波段间亮度和光谱指数的相关性。结果显示出一个明显的蓝时，更明亮的趋势。
Based on the radio light curves in 22 GHz and 37 GHz from the Metsahovi monitoring program and the optical light curves in BVRI bands from previously published results and the “Whole Earth Blazar Telescope” (WEBT) archives, we analyze the time delay among 22 GHz, 37 GHz and optical bands (B, V, R, I) of BL Lacertae by means of discrete correlation method. The results suggest there exist strong correlation among 22 GHz, 37 GHz and optical bands (B, V, R, I) with zero-lag. The 37 GHz lags behind R band by 11 months. The correlation of brightness and color index among BVRI bands, brightness and spectral index between 37 GHz and 22 GHz are also investigated. The results show a clear trend of bluer-when-brighter.