Near Infrared Deep Survey for Investigation of both Dark Age of the Universe and Cosmic Reionization

为了研究宇宙早期的黑暗时代和宇宙再电离，我们利用高红移氢莱曼α发射观测了非常年轻的星系和红移z bbb80的活动星系核。为此，我们的团队一直在为8.2米的斯巴鲁望远镜开发一种新的近红外成像仪和光谱仪；多目标红外照相机和摄谱仪。该仪器已经完成并开放供公开使用。MOIRCS具有宽视场，4 arcmin x 7 arcmin。这是迄今为止8米级望远镜中最宽的红外相机。考虑到斯巴鲁望远镜非常高的图像质量，MOIRCS必须是世界上最强大、最高效的红外仪器。为了探测高红移氢莱曼α发射，我们制作了1.1微米至2.3微米的新型近红外窄带滤光片。这些窄带滤波器允许我们检测z = 9到18的莱曼α发射体。已知最远的L…More man α辐射源位于z = 6.96。这个天体是在光学窗口通过窄带滤光片巡天发现的。这些非常年轻的星系的存在鼓励我们对z = 7以外的莱曼α发射体进行深入的调查。我们的目标领域是GOODS- north和GOODS- south （GOODS =由哈勃太空望远镜和美国宇航局推动的大天文台起源深度调查）。这两个区域是由哈勃太空望远镜上的高级巡天相机（ACS）拍摄的。此外，到目前为止，许多大型望远镜设施已经在各种波长上进行了后续观测。哈勃超深场也位于GOODS-South。因此，这些领域是任何近红外深测计划最有前途的领域。我们已经获得了GOODS-North的非常深的近红外宽带图像。我们还在GOODS-South中获得了光学多带滤波图像。在GOODS-South， ISAAC在智利的8.2米超大望远镜上获得了非常深的近红外图像。因此，我们准备在斯巴鲁望远镜上使用我们的新型近红外窄带滤光片和MOIRCS进行非常深入的成像调查。由于MOIRCS自2006年以来已经准备好使用，但需要进行许多技术测试观察来检查总体性能。因此，到今年3月，我们没有任何观测时间使用新的近红外窄带滤光片。我们计划在即将到来的观测学期在斯巴鲁望远镜上使用我们的新滤光片。由于MOIRCS仍然是最大的近红外仪器，我们希望在不久的将来能够找到z = 7以外的非常高的红移Lyman α发射器。少

In order to investigate both the dark age and the cosmic reionization in early universe, we aim to observe very young galaxies and active galactic nuclei at redshift z > 8 by using highly-redshifted hydrogen Lyman alpha emission. For this purpose, our team has been developing a new near infrared imager and spectrograph for the 8.2 m Subaru Telescope; MOIRCS = Multi Object Infrared Camera and Spectrograph. This instrument has been already completed and opened for open use observations. MOIRCS has a wide field of view, 4 arcmin x 7 arcmin. This is the widest IR camera for such 8m class telescopes so far. Taking account of very high image quality of the Subaru Telescope, MOIRCS must be the most powerful and efficient IR instrument around the world.In order to detect highly redshifted hydrogen Lyman alpha emission, we have made new NIR narrowband filters from 1.1 micron to 2.3 micron. These narrowband filters allow us to detect Lyman alpha emitters from z = 9 to 18. The most distant know L … More yman alpha emitter is located at z = 6.96. This object was found by a narrowband filter survey in the optical window. The presence of such very young galaxies encourage us to make deep surveys for Lyman alpha emitters beyond z = 7.Our target fields are GOODS-North and GOODS-South (GOODS = Great Observatories Origins Deep Survey promoted by Hubble Space Telescope and NASA). These two fields have been imaged with the Advanced Camera for Surveys (ACS) on Hubble Space Telescope. Moreover, follow-up observations by many large telescope facilities at various wavelengths have been already made by now The Hubble Ultra Deep Field is also located in GOODS-South. Therefore, these fields are most promising fields for any NIR deep survey programs. We have already obtained very deep NIR broadband images of GOODS-North. We have also obtained optical multi-band filter images in GOODS-South. In the GOODS-South, very deep NIR images obtained with ISAAC on the 8.2m Very Large Telescope in Chile. Therefore, we are ready to make very deep imaging surveys with our new NIR narrowband filters with MOIRCS on the Subaru Telescope.Since the MOIRCS was ready for use since 2006, but many technical test observations were necessary to check the total performance. Therefore, we did not have any observing time to use our new NIR narrowband filters by this March. We are planning to use our new filters in the coming observation semester on the Subaru Telescope. Since MOIRCS is still the greatest NIR instrument, we hope that we will be able to find very high-redshift Lyman alpha emitters beyond z = 7 in near future. Less