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

大红移宇宙的准恒星天体 (QSO) 研究

• 批准号: 8715070
• 负责人: Franklin Briggs
• 金额: $ 27.4万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-15 至 1992-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8715070&HistoricalAwards=false
• 关键词: Quasi; Stellar; Object; QSO; Investigations

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.

高红移类星体将被用来研究分布， 宇宙早期的物质状态 辐射 穿过星系间的气体。 的 星系中的气体可以通过研究吸收 类星体光谱的谱线。 无线电和光学观测 波长和理论分析和模拟将进行 以提高我们对星系演化阶段的理解， 红移从1.8到4。 该研究将包括详细的 调查已被确定的特定物体， 特别关注和新的调查工作，以回答统计 同时也为后续工作提供了新的对象。 主要目标是完成对一个人口群体的研究， 类星体吸收系统， 其特征是严重阻尼的莱曼α氢线， 似乎是星系盘的前身 搜索将是 是由恒星发出的辐射形成的 负责生产重元素。 星星发出 电离辐射，它被转换成莱曼α 中性氢（HI）层。 因此，电离通量是 集中在莱曼α线，随后逃逸 并且可以在光谱中被检测到。 阻尼系统中灰尘的调查，流体动力学模拟 坍缩到“HI盘”的过程，以及对 附近的盘星系和红移21厘米波长的氢 将采用线路吸收系统。