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; 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.

高红移类星体将用于研究宇宙早期时期的物质分布和状态。 类星体中的辐射在中间的星系中通过气体。 可以通过研究类星体光谱的吸收线来研究星系中的气体。 将进行无线电和光学波长的观察以及理论分析和模拟，以提高我们对红移从1.8到4的星系演变阶段的理解。该研究将包括对已确定的特定兴趣的特定对象的详细研究，以及为特殊兴趣的特定对象和新的调查工作，以回答统计问题以及提供新的对象进行后续工作。 主要目标是完成以严重阻尼的Lyman Alpha氢系的特征的准恒星对象（QSO）吸收系统的研究，它们似乎是银河系磁盘的祖细胞。 将搜索恒星发射的辐射，这些恒星可能是负责重量元素的产生的辐射。 恒星发出电离辐射，该辐射通过中性氢（HI）层转化为Lyman Alpha。 因此，电离通量集中在Lyman alpha系列中，后来逃脱并可以在频谱中检测到。 对阻尼系统中的灰尘进行调查，对“ HI磁盘”的崩溃的流体动力模拟，以及对附近磁盘星系和红移21 cm波长氢线吸收系统的进一步无线电研究。