The First FIRST Gravitationally Lensed Quasar: FBQ 0951+2635
The First FIRST Gravitationally Lensed Quasar: FBQ 0951+2635
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第一个引力透镜类星体：FBQ 0951 2635
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
R. White
中科院分区：
文献类型：
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作者：
P. Schechter;M. Gregg;R. Becker;D. Helfand;R. White
红移z=1.24处的V=16.9类星体FBQ0951+2635在亚角秒视中出现双倍曝光。这两个物体相隔1。“1，亮度相差0.9毫克。VLA观测表明，在相同的间隔和位置角下，射电源是双倍的。用Keck II望远镜拍摄的光谱显示，这两个组分的发射线光谱几乎相同，但吸收线系统略有不同。从这对分量中减去两个恒星点扩散函数，始终得到残留物。根据这第三个天体是延伸的还是点源，它的亮度可能是更亮的类星体成分的1/10，也可能是更亮的1/100。这些观测结果毫无疑问地表明，这两个较亮的天体是同一类星体的引力透镜图像。第三个天体可能是透镜星系，也可能是类星体的第三张图像，但这两种解释都存在严重缺陷。
The V = 16.9 quasar FBQ 0951+2635 at redshift z = 1.24 appears double on CCD exposures taken in subarcsecond seeing. The two objects are separated by 1.″1 and differ in brightness by 0.9 mag. VLA observations show the radio source to be double with the same separation and position angle. Spectra taken with the Keck II Telescope show the two components to have nearly identical emission-line spectra, but with somewhat different absorption-line systems. Subtraction of two stellar point-spread functions from the pair of components consistently leaves a residual object. Depending upon whether this third object is extended or a point source, it may be as much as 1/10 or as little as 1/100 as bright as the brighter QSO component. The observations leave little doubt that the two brighter objects are gravitationally lensed images of the same quasar. The third object might be either the lensing galaxy or a third image of the quasar, but both interpretations have serious shortcomings.