Quasars and the Early Evolution of Massive Galaxies

类星体和大质量星系的早期演化

• 批准号: 0305833
• 负责人: Jack Baldwin
• 金额: $ 25.38万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0305833&HistoricalAwards=false
• 关键词: Quasars; Early; Evolution; Massive; Galaxies

AST-0305833BaldwinQuasar emission lines offer a way to trace the strongly evolving physical conditions in the central regions of young massive galaxies. The gas in the Broad Emission Line Region (BELR) should reveal the chemical evolution in the host galaxy from which it has fallen, and the observed emission lines are not sensitive to the unknown structure of this region. The BELR line strengths also reflect directly the rate of dynamical evolution in the center of the host galaxy. The brightness of these lines means they can be measured precisely even out to quite large redshifts, but they have been hard to interpret. The PI will further check the interpretation methods he has been developing for some years, and will run numerical experiments to determine the best lines to use and to calibrate the use of iron abundances as a chronometer, as well as to understand the true uncertainties in the derived properties of BELRs. Armed with those results, optimized observations will obtain high quality spectra of a carefully selected sample, and derive parameters that can directly reveal early evolution at the centers of massive galaxies.The PI will set up a strong public outreach program through the Abrams Planetarium at Michigan State, using a flashy, continuously running presentation with this research as a background, to inform the thousands of annual visitors about cosmology, the birth of galaxies, and the origin of the chemical elements. With this as a basis it should be possible to produce a more widely distributed planetarium show that will reach an even broader audience.

AST-03058333BaldWinquasar发射线提供了一种追踪年轻大型星系中央区域中强烈不断发展的身体状况的方法。宽发射线区域（BELR）中的气体应揭示其掉落的宿主星系中的化学演化，并且观察到的发射线对该区域的未知结构不敏感。 BELR线强度还直接反映了宿主星系中心的动力学演化速率。 这些线的亮度意味着它们可以精确地测量到相当大的红移，但很难解释。 PI将进一步检查他已经开发了几年的解释方法，并将运行数值实验，以确定最佳的使用线，并校准铁丰度用作计时量表，并了解BELR的衍生性质中的真正不确定性。 通过这些结果武装，优化的观察结果将获得一个经过精心选择的样本的高质量光谱，并得出可以直接揭示大型星系中心的早期进化。PI将通过密歇根州的艾布拉姆斯（Abrams Planetarium）在密歇根州的艾布拉姆（Abrams PlaneTarium）中建立一个强大的公共宣传计划，使用一场浮华，与该研究的一年一度的访问者一起，访问了一年一度的访问者，这些杂志的访问者和访问者均经过一年的访问，以供访问一年一度的流浪者。化学元素。 以此为基础，应该可以产生更广泛的分布的天文馆表演，以吸引更广泛的受众。