Infrared Spectroscopy of Distant Forming Galaxies

作为斯巴鲁望远镜第一代仪器之一的oh -气辉抑制器及其摄像机部分（CISCO）是经过两年多的研制而成的。特别研制了安装在CISCO公司滤光轮上，用于无缝隙多物光谱模式的曾格棱镜，并通过在日本的试验观测对其性能进行了测试。这个新概念观测程序的试验结果总结如下。利用安装在日本三高红外模拟望远镜上的CISCO无狭缝多目标光谱模式，成功探测到一颗遥远类星体的氢发射谱线。利用实测图像验证了该观测模式的性能。斯巴鲁望远镜的空间分辨率对于这种观测模式非常重要，因为图像大小会影响光谱分辨率目录。我们可以确认望远镜的惊人性能（尽管望远镜有更多的缺陷，但最小图像尺寸为0.2弧秒），这表明无缝隙多目标光谱模式的性能比我们预期的要优越。这种观测方式的总效率（包括探测器的量子效率）约为30%。这与通常光学设计非常复杂的其他红外光谱仪相比具有显著的高价值。从这些测试观测结果来看，该观测模式的预期极限星等为21等（λ =2.1, S/N=5）。工程期间计划的观测目标到今年夏天是几个射电星系的周围区域，如B3 0731*438和B3 0939*381，以及选定的空白区域，如斯巴鲁深场。遥远的星系团将通过探测高红移氢发射线来观测。通过这些观测将发现通常的多色探测技术无法识别的新的高红移星团，并将通过“红外无缝隙多目标光谱”的新概念观测技术来研究遥远宇宙中星系的形成过程。少

The OH-airglow suppressor, one of the first generation instruments of Subaru telescope, and its camera section (CISCO) have been developed for these two years. In particular, the Zenger prism which was installed in the filter wheel of CISCO and used for the slitless multi-object spectroscopy mode was manufactured, and then, tested its performance through the test observation in Japan. The summary of the test results for this new-concept observing procedure are as follows.The hydrogen emission line of a distant quasar was detected successfully by the slitless multiobject spectroscopy mode of CISCO mounted on the IR simulator telescope in Mitaka. The performance of this observing mode was demonstrated by using real obtained image.The spatial resolution of the Subaru telescope is very important for this observing mode, because the image size affects the spectral resolution directory. We could confirm the amazing performance of the telescope (the minimum image size of 0.2 arcsec despite th … More e imperfection of the telescope), indicating more superior performance of the slitless multi-object spectroscopy mode than we expected.The total efficiency of this observing mode (including the quantum efficiency of the detector) is about 30%. This is significantly high value comparing with the other infrared spectrograph which usually have very complicated optical design. The expected limiting magnitude of this observing mode is 21mag (lambda=2.1mum, S/N=5) from the results of these test observations.The scheduled observing targets during the engineering term up to this summer are the surrounding areas of several radio galaxies such as B3 0731*438 and B3 0939*381, and the selected blank fields such as Subaru Deep Fields. The distant cluster of forming galaxies will be surveyed by detecting the high-redshifted hydrogen emission lines. New high-redshift clusters which could not identified by usual multi-color detection technique will be discovered through these observations, and the galaxy forming process in the distant universe will be investigated by the new-concept observing technique of "infrared slitless multi-object spectroscopy". Less