SDSS J1650+4251: A New Gravitational Lens
SDSS J1650+4251: A New Gravitational Lens
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SDSS J1650 4251：新型引力透镜
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
L. Reens
中科院分区：
文献类型：
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作者：
N. Morgan;J. Snyder;L. Reens
我们报告说，斯隆数字巡天类星体SDSS J165043.44+425149.3被引力透镜成两幅图像，这是基于基特峰国家天文台的WIYN 3.5米望远镜获得的观测结果。这颗被透镜的类星体，红移为z = 1.547，呈现为两幅相距1的图像。″2，b级震级分别为17.8和20.0。在2010年获得的i波段图像中可以清楚地探测到透镜星系。″3通过点扩散函数减去两个类星体图像。在双类星体的未解析SDSS光谱中也发现了一个强金属线吸收系统，表明透镜红移z = 0.58。这对类星体的UBRI通量比相差很大，从蓝色的8.5:1到红色的5.4:1，相差0.5等，这可能是由于透镜星系的不同变红，一个或两个类星体图像中的微透镜，或者两者的某种组合。需要对这对类星体进行光学监测，特别是在蓝色波长，以确定微透镜效应是否确实重要。假设中间的吸收系统是由于透镜星系造成的，类星体图像之间预测的时间差大约是1个月。
We report that the Sloan Digital Sky Survey quasar SDSS J165043.44+425149.3 is gravitationally lensed into two images, based on observations obtained with the WIYN 3.5 m telescope at the Kitt Peak National Observatory. The lensed quasar, at a redshift of z = 1.547, appears as two images separated by 1.″2 with B-band magnitudes of 17.8 and 20.0. The lensing galaxy is clearly detected in I-band images obtained in 0.″3 seeing after point-spread function subtraction of the two quasar images. A strong metal-line absorption system is also identified in the unresolved SDSS spectrum of the double quasar, suggesting a plausible lens redshift of z = 0.58. The UBRI flux ratios of the pair vary significantly, from 8.5 : 1 in the blue to 5.4 : 1 in the red, a difference of 0.5 mag, and are likely due to differential reddening through the lensing galaxy, microlensing in one or both quasar images, or some combination of the two. Optical monitoring of the quasar pair, particularly at blue wavelengths, will be needed to determine if microlensing is indeed significant. The predicted differential time delay between the quasar images is on the order of 1 month, assuming the intervening absorption system is due to the lensing galaxy.