Discovery of Multiply Imaged Galaxies behind the Cluster and Lensed Quasar SDSS J1004+4112
Discovery of Multiply Imaged Galaxies behind the Cluster and Lensed Quasar SDSS J1004+4112
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DOI：
10.1086/452633
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
K. Sharon;E. Ofek;Graham P. Smith;T. Broadhurst;D. Maoz;C. Kochanek;M. Oguri;Y. Suto;N. Inada;E. Falco
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文献类型：
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作者：
K. Sharon;E. Ofek;Graham P. Smith;T. Broadhurst;D. Maoz;C. Kochanek;M. Oguri;Y. Suto;N. Inada;E. Falco
我们在哈勃太空望远镜的红移z = 0.68星团图像中发现了三个多重成像的星系，这些星团负责大间距四透镜类星体SDSS J1004+4112。利用Keck I 10米望远镜，已经确定了其中两个系统的光谱红移。最遥远的透镜星系，在z = 3.332处，至少形成了四幅图像，并且爱因斯坦环的面积是透镜QSO图像的爱因斯坦环的3.1倍，在z = 1.74处，由于更大的源距离。对于第二个多次成像的星系，我们在红移z = 2.74处确定了Lyα的发射。星系团的质量分布可以从最亮的星系团星系的中心附近（在那里我们观察到径向弧和透镜类星体的第五幅图像）到最高红移星系的爱因斯坦半径，~110 kpc。我们的初步模拟表明，质量近似于一个椭圆体，其平均投影对数梯度为≃-0.5。该系统对于在以前未测试过的红移范围内直接测量世界模型具有潜在的用途。
We have identified three multiply imaged galaxies in Hubble Space Telescope images of the redshift z = 0.68 cluster responsible for the large-separation quadruply lensed quasar, SDSS J1004+4112. Spectroscopic redshifts have been secured for two of these systems using the Keck I 10 m telescope. The most distant lensed galaxy, at z = 3.332, forms at least four images, and an Einstein ring encompassing 3.1 times more area than the Einstein ring of the lensed QSO images at z = 1.74, due to the greater source distance. For a second multiply imaged galaxy, we identify Lyα emission at a redshift of z = 2.74. The cluster mass profile can be constrained from near the center of the brightest cluster galaxy, where we observe both a radial arc and the fifth image of the lensed quasar, to the Einstein radius of the highest redshift galaxy, ~110 kpc. Our preliminary modeling indicates that the mass approximates an elliptical body, with an average projected logarithmic gradient of ≃-0.5. The system is potentially useful for a direct measurement of world models in a previously untested redshift range.