Discovery of three strongly lensed quasars in the Sloan Digital Sky Survey

Discovery of three strongly lensed quasars in the Sloan Digital Sky Survey
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斯隆数字巡天发现三个强透镜类星体

DOI:
10.1093/mnrasl/sly043
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发表时间:
2018
影响因子:
--
通讯作者:
Lemaux, B C
Lemaux, B C
中科院分区:
--
文献类型:
--
作者:
Williams, P R;Agnello, A;Treu, T;Abramson, L E;Anguita, T;Apostolovski, Y;Chen, G C-F;Fassnacht, C D;Hsueh, J W;Lemaux, B C

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我们目前发现的三个类星体透镜在斯隆数字巡天,选择使用两种新的光度为基础的选择技术。在J 0941 +0518系统中,星系两侧各有一个相距5.46角秒的点光源,其光源和透镜的红移分别为1.54和0.343。J2257+2349的图像显示了在E/S 0星系两侧相隔1.67角秒的两个点源。提取的光谱显示了两个图像相同的类星体atzs= 2.10。SDSS J1640+1045有两个类星体光谱atzs= 1.70,与SDSS和Pan-STARRS图像相吻合,证实了在两个点源之间存在一个星系。我们在后续活动中观察了56个光度选择的透镜候选者,确认了3个新透镜,重新发现了1个已知的透镜,并排除了36个候选者,其中16个仍不确定。这一初步活动表明了纯粹的光度选择技术在寻找透镜类星体方面的力量。
We present the discovery of three quasar lenses in the Sloan Digital Sky Survey, selected using two novel photometry-based selection techniques. The J0941+0518 system, with two point sources separated by 5.46 arcsec on either side of a galaxy, has source and lens redshifts 1.54 and 0.343. Images of J2257+2349 show two point sources separated by 1.67 arcsec on either side of an E/S0 galaxy. The extracted spectra show two images of the same quasar atzs= 2.10. SDSS J1640+1045 has two quasar spectra atzs= 1.70 and fits to the SDSS and Pan-STARRS images confirm the presence of a galaxy between the two point sources. We observed 56 photometrically selected lens candidates in this follow-up campaign, confirming three new lenses, re-discovering one known lens, and ruling out 36 candidates, with 16 still inconclusive. This initial campaign demonstrates the power of purely photometric selection techniques in finding lensed quasars.
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