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Development of Optical Fiber-based Multi-Object Spectrograph for Investigations of Galaxy Formation History

开发用于研究星系形成历史的光纤多目标摄谱仪

基本信息

批准号：
14204016
负责人：
MAIHARA Toshinori
金额：
$ 28.62万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

We have developed a new near-infrared spectrograph capable of measuring spectra of high-redshift galaxies in the multi-object mode and/or in the 2-D mode, for the purpose of investigating systematic spectroscopic studies by survey observations of high-redshift galaxies and quasars. The specifications of the spectrograph are, the wavelength range of 0.8 to 1.8 microns, the multiplicity of 400 in the multi-object mode, and 250 in the 2-D mode (IFU mode). During the period of this developmental work from 2002 to 2004,we have designed and fabricated a prime-focus mechanical/optical unit, a near-infrared spectrograph with newly developed optical components, and a large array detector system. As of March 2004,we have been testing the fiber-slit images of the spectrograph as a whole, and the system will be tested on the Subaru Telescope in the first quarter of FY 2005,and then the spectroscopic observations will be made in the fall of 2005. Along with these developmental works, we have investigated high-redshift object such as normal galaxies, radio galaxies, and quasars, whose data were acquired by the unique near-infrared spectrograph (OHS) as well as the infrared imager (CISCO) at Subaru Telescope. Based on these spectroscopic and photometric data, we found chemical evolution of quasar environment by measuring near-infrared emission lines of metal elements such as Fe and Mg, and also found one or two massive galaxies at a high-redshift region with clear indication of disk feature. On the basis of the above results of developmental and observational works, we plan to continue systematic investigations of the galaxy/quasar evolution in the early universe by utilizing the unique capability of our high multiplicity instrument.

为了通过对高红移星系和类星体的巡天观测进行系统的光谱学研究，我们研制了一台能够在多目标模式和/或二维模式下测量高红移星系光谱的新型近红外光谱仪。光谱仪的规格是，波长范围为0.8至1.8微米，在多目标模式下的多重性为400，在2-D模式（IFU模式）下的多重性为250。在2002年至2004年的开发工作期间，我们设计并制造了一个主聚焦机械/光学单元，近红外光谱仪与新开发的光学元件，和一个大阵列探测器系统。截至2004年3月，我们一直在测试光谱仪的光纤狭缝图像作为一个整体，该系统将在斯巴鲁望远镜上测试在2005财年的第一季度，然后光谱观测将在2005年秋季。沿着这些发展性工作，我们利用斯巴鲁望远镜独特的近红外光谱仪（OHS）和红外成像仪（CISCO）获得了正常星系、射电星系和类星体等高红移天体的观测数据。基于这些光谱和光度数据，通过测量Fe和Mg等金属元素的近红外发射线，我们发现了类星体环境的化学演化，并在高红移区发现了一个或两个具有明显盘状特征的大质量星系。在上述发展和观测工作结果的基础上，我们计划利用我们的高多重性仪器的独特能力，继续系统地研究早期宇宙中的星系/类星体演化。