THE RADIO TIME-DELAY IN THE DOUBLE QUASAR 0957+561

被引：76
|
作者：
LEHAR, J [1 ]
HEWITT, JN [1 ]
ROBERTS, DH [1 ]
BURKE, BF [1 ]
机构：
[1] BRANDEIS UNIV,DEPT PHYS,WALTHAM,MA 02254
来源：
ASTROPHYSICAL JOURNAL | 1992年 / 384卷 / 02期
关键词：
GRAVITATIONAL LENSING; QUASARS; INDIVIDUAL; (0957+561);
D O I：
10.1086/170887
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Gravitational lens models for the double quasar 0957 + 561 predict that there should be a time delay of roughly 1 year between the arrival of wave fronts from the two images. In order to measure this delay, we have been monitoring the flux densities at lambda = 6 cm of 0957 + 561A and 0957 + 561B since 1979. We present the flux curves of the two images constructed from the VLA data, which are accurate to 2% of the image flux densities. The VLA data are best fitted by a time delay of 1.40 +/- 0.1 yr (513 +/- 40 days, A leading), with a magnification ratio (B/A) of 0.697 +/- 0.003. The error estimates were obtained through Monte Carlo methods, and include 68% of the simulated solutions.
引用
收藏
页码：453 / 466
页数：14
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