Support for the Gravitational Lens Interpretation of SBS 0909+532
Support for the Gravitational Lens Interpretation of SBS 0909+532
复制标题
支持 SBS 0909 532 的引力透镜解释
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
L. Goicoechea
中科院分区：
文献类型：
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作者：
A. Oscoz;M. Serra;E. Mediavilla;J. Buitrago;L. Goicoechea
SBS 0909+ 532 A，B是一个双星系统，由一个类星体和一个较暗的成分组成，到目前为止，光谱学上还没有解析出来。4.2米威廉赫歇尔望远镜在良好视宁度（FWHM= 1 '）下拍摄的光谱将A和B分量分开，表明两者都是具有相同红移（z=1.377）和相同光谱的类星体。因此，这支持SBS 0909+532的引力透镜解释。Mg II λλ2796，2803双峰在两个分量的相同红移（z=0.83）处的吸收中被发现，尽管最暗的一个的等效宽度是3倍强。我们讨论的可能性，这些吸收功能产生的光度不明透镜星系。我们还观测到另一个双星系统Q1222+226，最近报道它是一个引力透镜类星体。两个分量的光谱比较表明，Q1222+226实际上是由一个类星体和一颗星星组成的。
The system SBS 0909+532A, B is a double consisting of a quasar and a fainter component that was, until now, spectroscopically unresolved. Spectra taken in good seeing conditions (FWHM=1') with the 4.2 m William Herschel Telescope separate the A and B components, showing that both are quasars with the same redshift, z=1.377, and identical spectra. Consequently, this supports the gravitational lens interpretation of SBS 0909+532. The Mg II λλ2796, 2803 doublet is found in absorption at the same redshift (z=0.83) in both components, although the equivalent width of the faintest one is 3 times stronger. We discuss the possibility that these absorption features arise from the photometrically unidentified lensing galaxy. We have also observed another double system, Q1222+226, which was recently reported to be a gravitationally lensed quasar. Comparison of the spectra of both components indicates that Q1222+226 is in fact composed of a quasar and a star.