The Long-term and Intraday Variabilities of the BL Lac Object OJ287 at 5 GHz

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.

关键词： AGN OJ287 AGN variability long-term IDV

作者: L. CUi H. G. Song X. Liu

作者单位: Urumqi Observatory, National Astronomical Observatories, CAS, 4o-s South Beijing Road, Urumqi 890011 Urumqi Observatory, National Astronomical Observatories, CAS, 4o-s South Beijing Road, Urumqi 890011

会议类型: 国际会议

会议名称: The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)

会议地点: 昆明

会议语种:英文

页码: 212-213

在线出版日期: 2008-08-03（万方平台首次上网日期，不代表论文的发表时间）