Gravitationally lensed quasars in Gaia – IV. 150 new lenses, quasar pairs, and projected quasars
Gravitationally lensed quasars in Gaia – IV. 150 new lenses, quasar pairs, and projected quasars
复制标题
盖亚 IV 中的引力透镜类星体。
DOI：
10.1093/mnras/stac3721
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发表时间：
2022
影响因子：
4.8
通讯作者：
Shajib, A.
中科院分区：
文献类型：
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作者：
Lemon, C.;Anguita, T.;Auger-Williams, M. W.;Courbin, F.;Galan, A.;McMahon, R.;Neira, F.;Oguri, M.;Schechter, P.;Shajib, A.
我们在本系列论文 III 之后报告了使用 GaiaData Release 2 观测选择的 175 个透镜状类星体候选者的光谱跟踪。系统包括 86 个已确认的透镜类星体和基于成像和/或类似光谱的另外 17 个可能的透镜类星体。我们还确认了 11 个预计的类星体对和 11 个物理类星体对，而 25 个系统被保留为未分类的类星体对——具有相同红移的类星体对，它们可能是不同的类星体或潜在的透镜类星体。特别有趣的天体包括八个四重成像类星体，其中两个具有 BAL 源，一个明显的三重成像类星体，以及一个双透镜 LoBaL 类星体。这些新镜头的光源红移和图像分离范围分别为 0.65–3.59 和 0.78–6.23 角秒。我们将已知的透镜状类星体群与图像间隔在 1 到 4 角秒之间的更新的模拟目录进行比较，显示出非常好的匹配 atz< 1.5。 Atz> 1.5，仅预测数量的 47% 是已知的，其中 56% 的缺失镜头的图像间隔低于 1.5 角秒。缺失的较高红移、小间隔系统将具有较暗的透镜星系，部分原因是本工作中出现的未分类类星体对和可能的透镜，它们需要更深入的成像。在 11 个新报告的预计类星体对中，有 5 个的撞击参数低于 10 kpc，几乎使此类系统的数量增加了两倍，可以通过吸收研究探测类星体宿主星系的最内部区域。我们还报告了通过搜索发现的四个新的透镜星系，其源红移范围为 0.62 到 2.79。
We report the spectroscopic follow-up of 175 lensed quasar candidates selected usingGaiaData Release 2 observations following Paper III of this series. Systems include 86 confirmed lensed quasars and a further 17 likely lensed quasars based on imaging and/or similar spectra. We also confirm 11 projected quasar pairs and 11 physical quasar pairs, while 25 systems are left as unclassified quasar pairs – pairs of quasars at the same redshift, which could be either distinct quasars or potential lensed quasars. Especially interesting objects include eight quadruply imaged quasars of which two have BAL sources, an apparent triple, and a doubly lensed LoBaL quasar. The source redshifts and image separations of these new lenses range between 0.65–3.59 and 0.78–6.23 arcsec, respectively. We compare the known population of lensed quasars to an updated mock catalogue at image separations between 1 and 4 arcsec, showing a very good match atz< 1.5. Atz> 1.5, only 47 per cent of the predicted number are known, with 56 per cent of these missing lenses at image separations below 1.5 arcsec. The missing higher redshift, small-separation systems will have fainter lensing galaxies, and are partially explained by the unclassified quasar pairs and likely lenses presented in this work, which require deeper imaging. Of the 11 new reported projected quasar pairs, 5 have impact parameters below 10 kpc, almost tripling the number of such systems, which can probe the innermost regions of quasar host galaxies through absorption studies. We also report four new lensed galaxies discovered through our searches, with source redshifts ranging from 0.62 to 2.79.