DES meets Gaia: discovery of strongly lensed quasars from a multiplet search
DES meets Gaia: discovery of strongly lensed quasars from a multiplet search
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DES 遇见盖亚：通过多重态搜索发现强透镜类星体
DOI：
10.1093/mnras/sty1419
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发表时间：
2018
影响因子：
4.8
通讯作者：
Treu, T
中科院分区：
文献类型：
--
作者：
Agnello, A;Lin, H;Kuropatkin, N;Buckley-Geer, E;Anguita, T;Schechter, P L;Morishita, T;Motta, V;Rojas, K;Treu, T
我们报告了第一批强透镜类星体的发现、光谱确认和第一个透镜模型，这些类星体是在DES足迹上WISE和GAIA-DR1的联合搜索中发现的。他们的爱因斯坦半径范围在≈2.0角秒到≈0.4角秒之间。其中两个(WGD2038-4008，RA=20：38：02.65，Dec.=−40：08：14.64；WGD2021-4115，RA=20：21：39.45，Dec.=−41：15：57.11)也证实了偏转红移。四像透镜WGD2038-4008源和偏转器红移分别为0.777±0.001和0.230±0.002，偏转器半径Reff≈为3.4角秒，恒星质量和扩展的等光线形状变化。简单的透镜模型产生爱因斯坦半径RE=(1.30±0.04)角秒，轴比q=0.75±0.1(与星光相容)和相当大的剪切椭圆度简并。双像透镜WGD2021-4115ZS=1.390±0.001，ZL=0.335±0.002，爱因斯坦半径RE=(1.1±0.1)角秒，但需要更高分辨率的成像才能准确地分离偏转镜和微弱的类星体图像。J0146-1133、J0150-4041、J0235-2433、J0245-0556、J0259-2338和J0508-2748等6种透镜的简并模型与本文所示的相似。
We report the discovery, spectroscopic confirmation, and first lens models of the first, strongly lensed quasars from a combined search in WISE and Gaia-DR1 over the DES footprint. Their Einstein radii span a range between ≈2.0 arcsec and ≈0.4 arcsec. Two of these (WGD2038-4008, RA = 20:38:02.65, Dec. = −40:08:14.64; WGD2021-4115, RA = 20:21:39.45, Dec. = −41:15:57.11) also have confirmed deflector redshifts. The four-image lens WGD2038-4008, with source and deflector redshiftss= 0.777 ± 0.001 andzl= 0.230 ± 0.002, respectively, has a deflector with radiusReff≈ 3.4 arcsec, stellar mass, and extended isophotal shape variation. Simple lens models yield Einstein radiiRE= (1.30 ± 0.04) arcsec, axis ratioq= 0.75 ± 0.1 (compatible with that of the starlight) and considerable shear-ellipticity degeneracies. The two-image lens WGD2021-4115 haszs= 1.390 ± 0.001 andzl= 0.335 ± 0.002, and Einstein radiusRE= (1.1 ± 0.1) arcsec, but higher-resolution imaging is needed to accurately separate the deflector and faint quasar image. Analogous lens model degeneracies hold for the other six lenses (J0146-1133, J0150-4041, J0235-2433, J0245-0556, J0259-2338, and J0508-2748) shown in this paper.