The long-term and intraday variabilities of the BL Lac object OJ287 at 5 GHz

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	The long-term and intraday variabilities of the BL Lac object OJ287 at 5 GHz
	Cui, Lang 1,2; Song, HuaGang 2; Liu, Xiang 2
	2009
会议日期	August 3-6, 2008
会议地点	Kunming, Yunnan, China
关键词	AGN: OJ287 AGN: variability long-term IDV
页码	212-213
国家	China
英文摘要	In this paper, we use the databases of the university of Michigan Radio Astronomy Observatory (UMRAO) and the Very Large Array (VLA) at 5.0 GHz to analyze the radio light curve of BL Lac object OJ287 by both the power spectrum method and the structure function method. By analyzing several decades data, we find a new quasi-periodicity of 2.3 ± 0.1 yr in its light curves.We also carried out IntraDay Variability (IDV) observations at 5.0 GHz with the Urumqi 25m radio telescope from late 2006, to study the IDV properties of OJ287. We detected an IDV of 1.9 ± 0.6% on average in the source.We discussed the 2.3 yr quasi-periodic variability and the IDV of OJ287, which are both likely caused by intrinsic activities of the source.
源文献作者	Shuang Nan Zhang ; Yan Li ; Qing Juan Yu
产权排序	1
会议录	APRIM 2008: Proceedings of the 10th Asian-Pacific Regional IAU Meeting
会议录出版者	National Observatories of China Press
语种	英语
URL标识	查看原文
内容类型	会议论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4164]
专题	星系宇宙学研究团组
作者单位	1.Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 2.Urumqi Observatory, National Astronomical Observatories, CAS, 40-5 South Beijing Road, Urumqi 830011, China;
推荐引用方式 GB/T 7714	Cui, Lang,Song, HuaGang,Liu, Xiang. The long-term and intraday variabilities of the BL Lac object OJ287 at 5 GHz[C]. 见:. Kunming, Yunnan, China. August 3-6, 2008.