Collaborative Research: Cosmological All-wavelength Radiative Transfer (CART)

合作研究：宇宙学全波长辐射传输（CART）

• 批准号: 0807075
• 负责人: Tom Abel
• 金额: $ 24.28万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-15 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0807075&HistoricalAwards=false
• 关键词: Collaborative; Research; Cosmological; wavelength; Radiative

This group will investigate how the light of newly-forming galaxies and the active nuclei of galaxies propagates through the intergalactic gas. They focus attention on a period that ended about a billion years into cosmic history, when the neutral intergalactic gas was ionized by the ultraviolet light of galaxies. To calculate how gas and dark matter came together to make the galaxies, the group will use hydrodynamic simulations. They will develop and refine their calculations to predict when a galaxy should form stars, or develop an active nucleus. Then, the photons emerging from the galaxy will be tracked using Dr. Li's 3-dimensional radiative-transfer code. That code will be improved to handle Lyman-alpha photons, ionization, and the effect of very small dust grains. The group will produce large mock catalogs of high-redshift galaxies and quasars that describe their emission from X-ray to millimeter wavelengths, and include the hydrogen lines at 21cm and Lyman alpha. Two graduate students will be trained by participating in the research. The new radiative-transfer code, and the mock catalogs, will be made available to the astronomical community. Those catalogs summarize the predictions of our theories about how galaxies grow. This group and others will test those theories by comparing the catalogs with what is seen in current and planned deep surveys of distant galaxies. Both Dr. Li and Dr. Abel work at institutions with strong records in public outreach, and this project will yield attractive still images and movies to illustrate current ideas about galaxy formation.

该小组将研究新形成的星系和星系活动核的光如何通过星系际气体传播。 他们把注意力集中在宇宙历史结束约10亿年的时期，当时中性星系间气体被星系的紫外线电离。 为了计算气体和暗物质如何聚集在一起形成星系，该小组将使用流体动力学模拟。 他们将发展和完善他们的计算，以预测星系何时形成恒星，或发展一个活跃的核。 然后，利用李博士的三维辐射传输代码，对从星系中发出的光子进行跟踪。 该代码将得到改进，以处理莱曼α光子，电离和非常小的尘埃颗粒的影响。 该小组将制作大量高红移星系和类星体的模拟目录，描述它们从X射线到毫米波长的发射，包括21厘米和莱曼α的氢线。两名研究生将通过参与研究进行培训。 新的辐射转移代码和模拟目录将提供给天文学界。 这些星表总结了我们关于星系如何生长的理论的预测。 这个小组和其他人将通过将这些目录与当前和计划中的遥远星系的深度调查进行比较来测试这些理论。 李博士和阿贝尔博士都在公共宣传方面有着良好记录的机构工作，这个项目将产生有吸引力的静态图像和电影，以说明目前关于星系形成的想法。