Quasars Probing Quasars

类星体 探测类星体

• 批准号: 1010004
• 负责人: Jason Prochaska
• 金额: $ 48.4万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1010004&HistoricalAwards=false
• 关键词: Quasars; Probing

The purpose of this project is to research problems on the intergalactic medium (IGM), quasar evolution, and galaxy formation by analyzing the spectra of close quasar pairs. The existing dataset, comprised of over 100 pairs, enables a wide range of exploration in this grant period, including 1) Investigating the thermal history of the IGM at redshifts of 2 to 3; 2) Providing the first robust measure of the transverse proximity effect on scales of a few hundred kpc to several Mpc; and 3) Studying the physical state of the halo interstellar medium in the massive, high-redshift galaxies that host luminous quasars. The program will assess the chemical abundances, ionization state, density, and kinematics of the gas at impact parameters of tens to hundreds of kpc from bright, redshift 2 to 4 quasars. These observations will inform the processes of massive galaxy formation and the nature of quasar feedback at high redshift.Broader impacts of the work include training of undergraduate students recruited from a Hispanic Serving Institution, graduate students, and a postdoc, and public outreach activities.

本项目的目的是通过分析近距离类星体对的光谱来研究星系际介质、类星体演化和星系形成等问题。 现有的数据集，包括超过100对，使广泛的探索，在这个赠款期间，包括1）调查的热历史的IGM在红移2至3; 2）提供了第一个强大的措施，横向邻近效应的规模从几百千秒差距到几个百万秒差距; 3）研究存在发光类星体的大质量高红移星系中晕星际介质的物理状态。 该计划将评估来自明亮的红移2至4类星体的气体在数十至数百kpc的撞击参数下的化学丰度，电离状态，密度和运动学。这些观测将告知大规模星系形成的过程和类星体反馈的性质在高红移。更广泛的影响的工作包括从西班牙裔服务机构招募的本科生，研究生和博士后的培训，以及公共宣传活动。