EAPSI: Understanding ion-atom collisions in our Galaxy

EAPSI：了解银河系中的离子原子碰撞

• 批准号: 1414807
• 负责人: Renata Cumbee
• 金额: $ 0.51万
• 依托单位: Cumbee Renata S
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1414807&HistoricalAwards=false
• 关键词: EAPSI; Understanding; ion; atom; collisions

In order to improve our understanding of astrophysical objects in our galaxy, it is important to have models of the various processes that occur. Reliable models of X-ray emission due to a process called charge exchange (CX), a collision between an ion and a neutral atom or molecule, are currently of limited availability. Detailed knowledge of the emission spectra due to CX between ions and neutral hydrogen (H) and helium (He) are necessary to predict the resulting X-ray energy dependent spectra which we observe. This research will use explicit CX calculations produced by three astrophysically important collision systems. These calculations will then be benchmarked to measurements done by Dr. Hajime Tanuma's group at Tokyo Metropolitan University. Then, with collaborators at RIKEN, Osaka University, and Kyoto University, the calculated CX spectra will be compared to X-ray observations of the Cygnus Loop, a supernova remnant, using observations from the Japanese telescope Suzaku. This will give us insight into the processes occurring within the Cygnus Loop and other supernova remnants. This project will have a direct impact on advancing our understanding of atomic collisions and X-ray emission in various regions of our galaxy.CX is a fundamental process in atomic physics which has recently been attributed to the X-ray spectra of various astrophysical environments within our Solar System, supernova remnants, starburst galaxies, and extragalactic cooling flows. When both ions and neutrals are present, CX is one process that can occur which may dominate the ion emission spectra. This research will use explicit CX calculations produced by the astrophysically important collision systems of Fe{15+}, Fe{16+}, and Ne{8+} with He{+} to produce the X-ray emission spectra. This charge exchange data will then be used to model the Cygnus Loop, a supernova remnant that is currently not well understood in the X-ray regime. This NSF EAPSI award is funded in collaboration with the Japan Society for the Promotion of Science.

为了提高我们对银河系中天体物理物体的理解，重要的是要有各种发生过程的模型。目前，由于离子与中性原子或分子之间的碰撞-电荷交换(CX)过程而产生的X射线发射的可靠模型是有限的。对离子与中性氢(H)和氦(He)之间的CX发射光谱的详细了解是预测我们观察到的X射线能量依赖谱所必需的。这项研究将使用三个天体物理上重要的碰撞系统产生的显式CX计算。然后，这些计算将与东京大都会大学田间哈吉博士的团队所做的测量结果相比较。然后，与理化学研究所、大阪大学和京都大学的合作者一起，计算出的CX光谱将与使用日本Suzaku望远镜的观测结果对天鹅座环的X射线观测进行比较。天鹅座环是超新星遗迹。这将使我们深入了解天鹅座环路和其他超新星遗迹内发生的过程。这项计划将直接影响我们对银河系不同区域的原子碰撞和X射线发射的理解。CX是原子物理学中的一个基本过程，最近被归因于我们太阳系内各种天体物理环境、超新星遗迹、恒星爆发星系和银河系外冷却流动的X射线光谱。当离子和中性离子同时存在时，CX是一个可能发生的过程，它可能主导离子发射光谱。这项研究将使用Fe{15+}、Fe{16+}和Ne{8+}与He{+}的重要天体物理碰撞系统产生的显式CX计算来产生X射线发射光谱。这些电荷交换数据将被用来模拟天鹅座环，这是一种超新星遗迹，目前在X射线系统中还没有被很好地理解。该NSF EAPSI奖是与日本科学促进会合作资助的。