三重翻转：Jackpot引力透镜后面z~6处的第三个多重成像源
A Triple Rollover: A third multiply-imaged source at z~6 behind the Jackpot gravitational lens
摘要：
利用MUSE进行了5小时的自适应光学辅助观测，我们在z=0.222的透镜星系J 0946 +1006（“Jackpot”）后面发现了一个红移为5.975的双成像Ly α源。源分离意味着爱因斯坦半径约为2.5角秒。结合两个先前已知的爱因斯坦环在这个透镜（半径1.4角秒在z = 0.609和2.1角秒在z ~ 2.4），这个系统现在是一个独特的星系尺度的三源平面透镜。我们表明，现有的透镜模型为J 0946 +1006成功地映射到一个共同点上的z=5.975源平面的两个新观察到的图像。新的源将提供对透镜和先前已知的两个源中的质量分布的进一步约束。第三个源还探测了两个新的距离标度因子，它们对宇宙的宇宙学参数很敏感。我们发现，检测到一个新的多重成像发射线源在这个深度的观测并不意外;其他已知镜头的类似数据应该揭示了宇宙学和其他应用的多图像平面系统的更大样本。
英文摘要：
UUsing a five-hour adaptive-optics-assisted observation with MUSE, we have identified a doubly-imaged Ly alpha source at redshift 5.975 behind the z=0.222 lens galaxy J0946+1006 ('the Jackpot'). The source separation implies an Einstein radius of ~2.5 arcsec. Combined with the two previously-known Einstein rings in this lens (radii 1.4 arcsec at z = 0.609 and 2.1 arcsec at z ~ 2.4), this system is now a unique galaxy-scale triple-source-plane lens. We show that existing lensing models for J0946+1006 successfully map the two new observed images to a common point on the z=5.975 source plane. The new source will provide further constraints on the mass distribution in the lens and in the two previously known sources. The third source also probes two new distance scaling factors which are sensitive to the cosmological parameters of the Universe. We show that detection of a new multiply imaged emission-line source is not unexpected in observations of this depth; similar data for other known lenses should reveal a larger sample of multiple-image-plane systems for cosmography and other applications.
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