An Observational Study of Primeval Galaxies and Primeval Quasars

星系和类星体的形成和演化是现代天体物理学的重要问题之一。这个问题也与观测宇宙学有关。为了探索原始星系和类星体是什么，我们使用了欧洲航天局（ESA）发射的红外空间天文台（ISO），在7、90和175微米进行了非常深的观测。7微米深度的调查致力于寻找隐藏的尘埃星系，而90和175微米的调查则致力于寻找隐藏的尘埃类星体。利用Keck 10米射电望远镜、James Clerk麦克斯韦（JCMT）射电望远镜和VLA射电干涉仪对ISO探测到的100多个源进行了跟踪观测。我们已经发现了一些高红移的尘埃星系。这进一步证实了早期宇宙中尘埃天体的存在，并对星系和类星体形成的研究产生了很大的影响。

One of the most important problems in the modern astrophysics is the formation and evolution of galaxies and quasars. This problem is also related to the observational cosmology. Recent progress in the observational instruments for various wavelengths has been enabling us to investigate this problem.In order to explore what primeval galaxies and quasars are, we have used the Infrared Space Observatory (ISO) launched by ESA (European Space Agency) and performed very deep surveys at 7, 90, and 175 micron. The 7 micron deep survey is dedicated to the search for hidden dusty galaxies while the 90 and 175 micron surveys are dedicated to that for hidden dusty quasars. We then found more than 100 sources in these surveys.Using the Keck 10-m telescope, James Clerk Maxwell (JCMT) radio telescope, and the VLA radio interferometer, we have made follow-up observations of the sources detected by ISO. We have found some dusty galaxies at high redshift. This reinforces the existence of dusty objects in the early universe and has given the very big impact on the research of galaxy and quasar formation.