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: 0965694
• 负责人: Cindy Gulis
• 金额: $ 19.85万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0965694&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的光和星系的活性核如何通过白层间气体传播。 他们将注意力集中在宇宙历史上大约十亿年的时期，当时中性层间气体被星系的紫外线电离。 为了计算气体和暗物质如何组合以制造星系，该组将使用流体动力学模拟。 他们将开发并完善计算，以预测星系何时应形成恒星或发展活性核。 然后，将使用Li博士的3维辐射转移代码来跟踪从星系中出现的光子。 该代码将得到改进，以处理Lyman-Alpha光子，电离和非常小的尘土晶粒的效果。 该小组将生成大型的高红移星系和类星体的模拟目录，这些目录描述了它们从X射线到毫米波长的发射，并在21cm和Lyman Alpha中包括氢管。两名研究生将通过参加研究来接受培训。 新的辐射转移代码和模拟目录将提供给天文学界。 这些目录总结了我们关于星系如何生长的理论的预测。 该小组和其他人将通过将目录与当前和计划对遥远星系进行深入的深度调查进行比较来测试这些理论。 Li博士和Abel博士都在公共宣传方面拥有强大记录的机构工作，该项目将产生有吸引力的静止图像和电影，以说明有关银河形成的当前想法。