Numerical Simulation of Nebulae with Implications for Galactic Chemical Evolution

星云数值模拟对银河化学演化的影响

• 批准号: 9319034
• 负责人: Gary Ferland
• 金额: $ 30.01万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-05-15 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9319034&HistoricalAwards=false
• 关键词: Numerical; Simulation; Nebulae; Implications; Galactic

9319034 Ferland Emission line regions define the end points of stellar evolution and are present in the most luminous objects in the universe (the distant quasars). Detailed understanding of this gas requires reference to large- scale numerical simulations. This project will continue developing a computer program which simulates the physical conditions within a non-equilibrium plasma and predicts its spectrum. Several broad problems in active galactic nuclei, H II regions, and classical novae will be investigated . The emission line clouds of high redshift quasars have metallicities approaching 10 times solar, similar to those found in the cores of massive galaxies at similar epochs, and this metallicity correlates with luminosity and/or redshift. This work will probe galactic chemical evolution at large redshift. A second area to be investigated will involve an attempt to understand physical conditions within galactic H II regions and surrounding photodissociation regions. This will lead to a more complete understanding of measurements of galactic abundance gradients. Another area will be classical novae, to better constrain the mass and abundances of the ejecta, and thereby their contribution to galactic nucleosynthesis. ******

小行星9319034 发射线区域定义了恒星演化的终点， 宇宙中的天体（遥远的类星体）。 对这种气体的详细了解需要参考大规模的数值模拟。 该项目将继续开发一个计算机程序， 在非平衡等离子体的物理条件，并预测其光谱。 在活动星系核，氢II区，和经典新星几个广泛的问题将被调查。 高红移类星体的发射线云的金属丰度接近太阳的10倍，类似于 那些在类似时期的大质量星系核心中发现的，这种金属丰度与 亮度和/或红移。 这项工作将探测大红移的星系化学演化。 第二 一个要研究的领域将包括试图了解银河系H II内的物理条件 区域和周围的光解离区域。 这将有助于更全面地了解 银河丰度梯度的测量。 另一个领域将是经典新星，以更好地限制 喷出物的质量和丰度，从而它们对星系核合成的贡献。 ******