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Spectroscopic Study of Galaxy Formation and Evolution in the Early Universe

早期宇宙星系形成和演化的光谱研究

基本信息

批准号：
07044080
负责人：
MAIHARA Toshinori
金额：
$ 3.97万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07044080/
关键词：
cosmology galaxy protogalaxy infrared AGN high redshift spectroscopy galactic nucleus 高赤外偏移

项目摘要

The primary purpose of the project is to obtain information on the evolutionary process of protogalaxies at fairly early stages in the so-called high redshift Universe. The radiation of such target objects is mostly shifted to near-infrared from the original ultraviolet and optical bands, so that infared observations is in particular important. We therefore conducted high sensitivity spectrophotometries towards a couple of high-z galaxies, as well as AGN-type objects exploiting the OH-airglow suppressed spectrograph which has been developed in Kyoto University and attached to the 2.2m telescope in the Mauna Kea observatory, Hawaii. In the observations made during the period of this project we obtained very peculiar spectra of objects in the redshit range from 2 to 3 or more, showing strong emission lines, such as H-alpha, [OIII], and [NeII]. One of the extreme objects has been found to have a ratio of the [OIII] line emission energy relative to that in the photometric H-passband as hig … More h as 75 percent, which is suggestive that even galaxies in the earliest stage are already contaminated by metalic elements, or are very actively producing metal-rich interstellar gaseous components. We have also observed a dust-enshrouded quasar and a dumped Ly-alpha quasar, both of which are pressumably in the early evolutionary stage born in protogalaxies.We have carried out spectroscopic observations of the central regions of nearby active galactic nuclei as well, such as NGC1068 and NGC7319, using the newly developed near-infrared spectrograph and the microlens-based optical spectrometer, attached to telescopes in the Mauna Kea as well as in the Mt.Lemmon observatory. The optical observations reveal a dynamical infall motion of gases in the central vicinity. On the other hand, the infrared spectra have shown the presence of organic compositions in the form of solid grains in the central molecular torus. These findings provide information to model evolution of active galaxies in terms of the origin of dense molecular gas and its chemical history. Less

该项目的主要目的是获取有关所谓高红移宇宙中相当早期的原星系演化过程的信息。此类目标物体的辐射大多从原来的紫外和光学波段转移到近红外，因此红外观测就显得尤为重要。因此，我们利用京都大学开发的 OH 气辉抑制光谱仪，对几个高 z 星系以及 AGN 型天体进行了高灵敏度分光光度测量，该光谱仪已在京都大学开发，并附在夏威夷莫纳克亚天文台的 2.2 m 望远镜上。在该项目期间进行的观测中，我们获得了 2 到 3 或更多红光范围内非常奇特的物体光谱，显示出强发射线，例如 H-alpha、[OIII] 和 [NeII]。人们发现其中一个极端天体的[OIII]线发射能量相对于光度H通带的发射能量之比高达75%，这表明即使是最早期的星系也已经被金属元素污染，或者正在非常活跃地产生富含金属的星际气体成分。我们还观测到了一个被尘埃笼罩的类星体和一个被倾倒的Ly-α类星体，这两个类星体很可能是在原星系中诞生的早期演化阶段。我们还利用新研制的近红外光谱仪和基于微透镜的光谱仪，对NGC1068和NGC7319等附近活动星系核的中心区域进行了光谱观测。光学光谱仪，连接到莫纳克亚山和莱蒙山天文台的望远镜。光学观测揭示了中心附近气体的动态流入运动。另一方面，红外光谱显示中心分子环中存在固体颗粒形式的有机成分。这些发现为根据致密分子气体的起源及其化学历史来模拟活跃星系的演化提供了信息。较少的