On the difference in short timescale light variation between the high and low states of BL Lac objects

被引:0
作者
Bai, JM [1 ]
Xie, GZ [1 ]
机构
[1] Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China
关键词
AGN; BL Lac object; light variation; jet;
D O I
10.1016/S0275-1062(99)00073-9
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Combining our data for three BL Lac objects obtained in 1993-1995 with other authors' we note that activity is stronger and short timescale variations more frequent during the high than the low state. We propose that the relativistic jet in the AGN may change its orientation with time, and the high state corresponds to smaller angles of inclination to the line of sight, and the low, to larger angles. This explains the difference in behaviour as well as the new phenomenon discovered in the monitoring by Takalo et al.
引用
收藏
页码:412 / 422
页数:11
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