BL Lac天体 0735+178:类星体 3C147 VLBA偏振观测的偏振校准源(英文)  

BL LAC OBJECT 0735+178: A POLARIMETRIC CALIBRATOR FOR VLBA OBSERVATION OF QUASAR 3C147

作　　者：张海燕[1] 南仁东[2] 平劲松[1] 

机构地区：[1]北京师范大学天文学系,北京100875 [2]中国科学院北京天文台,北京100012

出　　处：《北京师范大学学报（自然科学版）》2000年第4期473-476,共4页Journal of Beijing Normal University(Natural Science)

基　　金：Project Supported by NSFC!(19973010)

摘　　要：为确定类星体 3C147的绝对偏振位置角 ,利用美国 VL BA对 BL L ac天体 0 735+178进行 5GHz波段偏振观测 ,得到源 0 .0 0 1″尺度高质量偏振图像 .结果显示 0 735+178具有核 -喷流结构 ,其喷流延伸达0 .0 1″,位置角约 65°,其中核部分偏振度为 2 .4 % ,喷流部分偏振较强 ,为 56% ,喷流中的磁场与喷流方向接近一致 .利用 BL L ac天体 0 735+178做偏振校准源 ,详细介绍了在 VLThe BL Lacerta Object 0735+178 was observed with VLBA at 5 GHz on May 1st, 1995 to determine the absolute polarization position angle of the quasar 3C147. High quality polarization maps at 5 GHz on milliarcsecond scales are presented, and show the source to be resolved with a core jet structure extending about 10×10 -3 (″) in position angle about 65°. The core is moderately polarized( m ≈2 4%), and jet component was more strongly polarized( m ≈56%). The magnetic field in the jet appeared to be roughly aligned with the jet direction. The procedure for determining the absolute position angle of sources of VLBI polarimetry observation is introduced in details using the BL Lac 0735+178.

关 键 词：偏振观测 目标源 偏振校准源 天文学 

分 类 号：P161.3[天文地球—天文学]