Infrared Spectroscopy of Distant Forming Galaxies

斯巴鲁望远镜的第一代仪器之一--氢气辉光抑制器及其摄像部分(思科)是这两年来发展起来的。特别是研制了安装在思科公司滤光轮上的用于无狭缝多目标光谱模式的增格棱镜，并通过在日本的测试观测对其性能进行了测试。对这一新概念观测过程的测试结果总结如下：利用安装在三中红外模拟器望远镜上的思科公司的无缝式多目标光谱模式，成功地探测到了遥远类星体的氢发射线。通过实际获取的图像对该观测模式的性能进行了验证，斯巴鲁望远镜的空间分辨率对该观测模式非常重要，因为图像的大小会影响光谱分辨率目录。我们可以证实望远镜令人惊叹的性能(最小图像尺寸为0.2弧秒，尽管…望远镜的缺陷更多)，这表明无狭缝多目标光谱模式的性能比我们预期的更优越。这种观察模式的总效率(包括探测器的量子效率)约为30%。与通常光学设计非常复杂的其他红外光谱仪相比，这是非常高的价值。根据这些试验观测的结果，这种观测模式的预期极限星等为21 MAG(波长=2.1微米，S/N=5)。截至今年夏天的工程期内，预定的观测目标是几个射电星系的周围区域，如B30731*438和B30939*381，以及选定的空白区域，如斯巴鲁深场。将通过探测高红移的氢发射线来探测遥远的正在形成的星系团。通过这些观测，将发现常规多色探测技术无法识别的新的高红移星系团，并将利用红外无狭缝多目标光谱这一新概念观测技术来研究遥远宇宙中星系的形成过程。较少

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