The snapshot survey - A search for gravitationally lensed quasars with the Hubble Space Telescope
The snapshot survey - A search for gravitationally lensed quasars with the Hubble Space Telescope
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快照巡天——用哈勃太空望远镜寻找引力透镜类星体
DOI：
10.1086/171060
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
B. Yanny
中科院分区：
文献类型：
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作者：
J. Bahcall;D. Maoz;R. Doxsey;D. Schneider;N. Bahcall;O. Lahav;B. Yanny
在系统地尝试寻找由引力透镜产生的多重成像类星体的新例子时，哈勃太空望远镜的行星相机通过两个滤光片对来自明确样本的高光度类星体进行了 89 次短曝光。大约 30 个类星体的有用高分辨率图像已经产生。没有一个类星体显示出由于引力透镜而产生多幅图像的证据。模拟表明，可以检测到亮度比高达几个数量级的多幅图像，图像间隔几乎等于0.1英寸。这些结果与较低分辨率的地面勘测和当前的理论预测进行了比较。快照勘测发现了天文台性能中的几个工程问题，其中一些已经得到纠正。特别是，我们发现大型望远镜的指向误差和漂移率主要是由于在观测时缺乏对恒星像差的校正造成的。仅仅使用陀螺仪进行指向和跟踪，简要讨论了可能较低的固有陀螺仪漂移率对未来观测的影响。
In a systematic attempt to find new examples of multiply imaged quasars that are the result of gravitational lensing, 89 short exposures, through two filters, of high-luminosity quasars from a well-defined sample have been obtained with the Hubble Space Telecope's Planetary Camera. Useful high-resolution images of approximately 30 quasars have resulted. None of the quasars show evidence of multiple images due to gravitational lensing. Simulations show that multiple images with brightness ratios of up to several magnitudes would have been detected, down to image separations of almost-equal-to 0.1". These results are compared with lower resolution ground-based surveys and current theoretical predictions. The Snapshot Survey has uncovered several engineering problems in the observatory's performance, some of which have already been corrected. In particular, we find that the large telescope pointing errors and drift rates are primarily the result of the lack of correction for stellar aberration when pointing and tracking are performed solely with gyroscopes. The implications of the possibly low intrinsic gyro drift rate on future observations are briefly discussed.