Quasi-Stellar Object (QSO) Investigations of the Universe at Large Redshifts

高红移类星体将被用来研究宇宙早期物质的分布和状态。来自类星体的辐射穿过中间星系中的气体。星系中的气体可以通过研究类星体光谱的吸收线来研究。将对射电和光学波长进行观测，并进行理论分析和模拟，以提高我们对红移从1.8到4的星系演化阶段的理解。这项研究将包括对已被确定为特别感兴趣的特定天体的详细调查，以及为回答统计问题和为后续工作提供新的天体的新调查工作。主要目标是完成对一组类恒星物体(QSO)吸收系统的研究，这些吸收系统的特征是严重受阻的莱曼阿尔法氢线，它们似乎是银河盘的前身。将对恒星发射的辐射进行搜索，这些辐射可能是产生重元素的原因。恒星发出的电离辐射被中性氢(HI)层转化为莱曼阿尔法。因此，电离通量集中在莱曼阿尔法谱线中，该谱线随后逃逸并可能在光谱中被检测到。将对受阻系统中的尘埃进行调查，对坍塌到“HI盘”的流体动力学模拟，以及对附近的盘星系和红移21厘米波长氢线吸收系统的进一步射电调查。

High redshift quasars will be used to study the distribution and state of matter at early epochs of the universe. The radiation from quasars passes through the gas in intervening galaxies. The gas in the galaxies can be studied by studying the absorption lines of the quasar spectrum. Observations at radio and optical wavelengths and theoretical analysis and simulations will be made to improve our understanding of the stages of galaxy evolution at redshifts from 1.8 to 4. The study will include both the detailed investigation of particular objects that have been identified to be of special interest and new survey work to answer statistical questions as well as providing new objects for follow-up work. The principle goal is completion of a study of a population of Quasi-Stellar Object (QSO) absorption systems that are characterized by heavily damped Lyman alpha hydrogen lines, they appear to be the progenitors of galactic disks. A search will be made for radiation emitted by stars that are presumably responsible for the production of heavy elements. The stars emit ionizing radiation which is converted to Lyman alpha by the neutral hydrogen (HI) layer. Thus, the ionizing flux is concentrated in the Lyman alpha line which subsequently escapes and may be detected in the spectrum. Surveys for dust in the damped systems, hydrodynamic simulations of the collapse to "HI disks", and further radio investigations of both nearby disk galaxies and redshifted 21 cm wavelength hydrogen line absorption systems will be carried out.