Modeling Star Formation in the Milky Way; Precision Updates to Cloudy Numerical Models

银河系恒星形成模型；

• 批准号: 1910687
• 负责人: Marios Chatzikos
• 金额: $ 45.46万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1910687&HistoricalAwards=false
• 关键词: Modeling; Star; Formation; Milky; Way

Astronomers test their understanding of our Universe by numerical models of observations. These models use measurements from Earth-bound labs, combined with many astronomical observations, to learn the properties of gas in star-forming clouds. The investigators' overarching goal is to improve their modeling program, called Cloudy, so they can faithfully simulate Nature. When the simulation is accurate, astronomers can deduce the temperature, density and chemical makeup of these distant clouds. The planned improvements to the investigators' program will increase the accuracy of chemical and quantum models to yield more accurate understanding of our Milky Way galaxy. The results of the investigators' model improvements will also increase our understanding of galaxies at great distances from the Earth. The investigators will modernize methods for including the wealth of quantum measurements used by the program. Currently the program uses simplifying assumptions for modeling the continuum-to-line emission ratio, and the transfer of continua, including dust properties. The investigators will more accurately implement the equations for level populations. In terms of the treatment of radiative transfer, Cloudy self-consistently models the physics of optical pumping by background continua, free- and bound-electron scattering, and grain emission and absorption. Alongside this research activity, this project involves a strong outreach component. Lexington, KY is home to a significant Hispanic population. They are underrepresented in STEM disciplines. Building on an ongoing program, the investigators will introduce these students to Science. The investigators will present their research at high schools and host an annual "Festival del Espacio" event on their campus open to students, their parents, and teachers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

天文学家通过观测的数值模型来检验他们对宇宙的理解。 这些模型使用来自地球实验室的测量结果，结合许多天文观测，以了解恒星形成云中气体的性质。 研究人员的首要目标是改进他们的建模程序，称为Cloudy，这样他们就可以忠实地模拟自然。 当模拟准确时，天文学家可以推断出这些遥远云层的温度，密度和化学成分。对研究人员计划的改进将提高化学和量子模型的准确性，以更准确地了解我们的银河系。 研究人员模型改进的结果也将增加我们对距离地球很远的星系的了解。 研究人员将使方法现代化，以包括该计划使用的大量量子测量。 目前，该计划使用简化的假设建模的连续到线的排放比，和连续的传输，包括灰尘的属性。研究人员将更准确地实现水平种群的方程。在辐射传输的治疗方面，多云自洽模型的物理背景连续，自由和束缚电子散射，晶粒发射和吸收的光泵。除了这项研究活动，该项目还包括一个强有力的外联部分。列克星敦，肯塔基州是一个重要的西班牙裔人口。他们在STEM学科中的代表性不足。 在一个正在进行的项目的基础上，研究人员将向这些学生介绍科学。研究人员将在高中展示他们的研究，并在校园内举办一年一度的“Festival del Espacio”活动，向学生、家长和教师开放。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

X-Ray Spectroscopy in the Microcalorimeter Era 4: Optical Depth Effects on the Soft X-Rays Studied with Cloudy

微热量计时代 4 的 X 射线光谱：阴天研究的软 X 射线的光学深度效应

• DOI: 10.3847/1538-4357/ac7eb9
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: Chakraborty, Priyanka;Ferland, Gary J.;Chatzikos, Marios;Fabian, Andrew C.;Bianchi, Stefano;Guzmán, Francisco;Su, Yuanyuan
• 通讯作者: Su, Yuanyuan

Recent Updates to the Gas-phase Chemical Reactions and Molecular Lines in CLOUDY: Their Effects on Millimeter and Submillimeter Molecular Line Predictions

• DOI: 10.3847/1538-4357/ac7789
• 发表时间: 2022-06
• 期刊: The Astrophysical Journal
• 作者: G. Shaw;G. Ferland;M. Chatzikos

Self consistent grain depletions and abundances II: Effects on strong-line diagnostics of extragalactic H ii regions

自相一致的颗粒消耗和丰度 II：对河外 H ii 区域强线诊断的影响

• DOI: 10.1093/mnras/stad322
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Gunasekera, Chamani M;Ji, Xihan;Chatzikos, Marios;Yan, Renbin;Ferland, Gary
• 通讯作者: Ferland, Gary

Self-consistent grain depletions and abundances I: the Orion Nebula as a test case

自洽的颗粒损耗和丰度 I：猎户座星云作为测试案例

• DOI: 10.1093/mnras/stac022
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Gunasekera, Chamani M.;Ji, Xihan;Chatzikos, Marios;Yan, Renbin;Ferland, Gary
• 通讯作者: Ferland, Gary

Recent Updates of Gas-phase Chemical Reactions and Molecular Lines of SiS in CLOUDY

云中 SiS 气相化学反应和分子谱线的最新进展

• DOI: 10.3847/2515-5172/acc1ea
• 发表时间: 2023
• 期刊: Research Notes of the AAS
• 作者: Shaw, Gargi;Ferland, Gary;Chatzikos, M.
• 通讯作者: Chatzikos, M.