Discovery of a Strongly Lensed Galaxy at z=3.9 behind a z=0.83 Galaxy Cluster
Discovery of a Strongly Lensed Galaxy at z=3.9 behind a z=0.83 Galaxy Cluster
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DOI：
10.1093/pasj/57.6.877
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发表时间：
2005-06
影响因子：
2.3
通讯作者：
K. Umetsu;Masayuki Tanaka;T. Kodama;I. Tanaka;T. Futamase;N. Kashikawa;T. Hoshi
中科院分区：
文献类型：
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作者：
K. Umetsu;Masayuki Tanaka;T. Kodama;I. Tanaka;T. Futamase;N. Kashikawa;T. Hoshi
根据斯巴鲁望远镜上的暗物相机和光谱仪的观测，我们在一个遥远的富星系团的背景中发现了三幅z=3.9星系的引力透镜图像，并进行了光谱确认。我们建立了一个简单的透镜模型的星团质量分布的基础上，Jee等人，S弱透镜质量估计从深，高分辨率图像的先进相机在哈勃太空望远镜上的调查。该透镜模型可以同时考虑观测到的图像构型和位于临界曲线附近的较近对的流量比。这三幅图像的奇偶性也符合透镜假说。由于这个星系由于放大而明显红移(i�∼23.7)，因此它是一个很好的高红移目标，我们可以基于多波长成像和光谱对其进行广泛和详细的研究。
We report on the discovery and spectroscopic confirmation of three gravitationally-lensed images of a galaxy at z =3 .9 in the background of a distant, rich cluster of galaxies at z =0 .83, on the basis of observations with Faint Object Camera And Spectrograph on the Subaru telescope. We construct a simple lens model of the cluster mass distribution based on Jee et al.’s weak lensing mass estimates from deep, high-resolution images by Advanced Camera for Surveys on the Hubble Space Telescope. The lens model can account simultaneously for the observed image configuration and the flux ratio of the closer pair located close to the critical curve. The parities of the three images are also consistent with the lensing hypothesis. Since this galaxy is apparently bright (i � ∼ 23.7) for its redshift due to magnification, it serves as a good high-redshift target on which we can make extensive and detailed studies based on multi-wavelength imaging and spectroscopy.