Cosmic ray production and transport in astrospheres

天体中宇宙射线的产生和传输

• 批准号: 232615537
• 负责人: Dr. Klaus Scherer
• 金额: --
• 依托单位: Zentrum für Astronomie und Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/232615537?language=en
• 关键词: Cosmic; ray; production; transport; astrospheres

One paradigm concerning galactic cosmic ray spectra is that they are created in violent events, like supernova explosions. Recently, we have demonstrated that Sun-like stars can contribute to the lower energy range of the cosmic ray proton spectrum, by creating so-called anomalous cosmic rays (ACRs) in their outer astrospheres from originally interstellar neutral atoms. The main goal of this proposal is to continue and extend this approach, i.e. to model, based on observations, astrospheres (interstellar bubbles) and their ACR production for cool (F,G,K, and M) as well as for hot (O and B) stars located in different interstellar environments. Thus, we will, for the first time, quantify the contribution of cool stars to the low energy (GeV) range of cosmic rays, and give a quantitative estimate for the middle energy (TeV) range produced in astrospheres (interstellar bubbles) of hot stars. To do so, we will for the first time, incorporate not only cooling and heating terms in the energy equation of hot stars, but also consider the mass,- momentum-, and energy loading in the Euler equations self-consistently. For the latter the ionization reactions, like charge exchange between different atoms and ions, as well as the electron impact and photoioniziation will be included into the BoPo-code. Thus after modeling the large scale structure of astropheres, we will self-consistently determine the large scale anomalous cosmic ray flux and its leakage into the interstellar medium. The proposed research is timely, because it offers explanations to the recent observations of single ionized H3 regions, as well as the origin of cosmic rays in the TeV range. Such observations were recently made by the large area telescopes, like IceCube among others, and gamma-ray observatories.As an inherent result of the model we will provide the cosmic ray and neutral hydrogen fluxes inside the astrospheres of cool stars, possibly hosting exoplanets in habitable zones. All results will be made available on a public server at the Ruhr-Universität Bochum.

关于银河系宇宙射线光谱的一个范例是，它们是在剧烈的事件中产生的，比如超新星爆炸。最近，我们已经证明，类太阳恒星可以通过从最初的星际中性原子在其外部天体层中产生所谓的异常宇宙射线（ACR）来贡献宇宙射线质子谱的较低能量范围。该提案的主要目标是继续和扩展这种方法，即根据观测结果，对位于不同星际环境中的冷（F、G、K和M）恒星和热（O和B）恒星的天体层（星际气泡）及其ACR产生进行建模。因此，我们将首次量化冷恒星对宇宙射线低能（GeV）范围的贡献，并对热恒星的天体层（星际气泡）中产生的中能（TeV）范围进行定量估计。 为了做到这一点，我们将第一次，不仅纳入热恒星的能量方程中的冷却和加热项，而且还考虑欧拉方程中的质量，动量和能量负载自洽。对于后者，电离反应，如不同原子和离子之间的电荷交换，以及电子碰撞和光电离将包括在BoPo代码中。因此，在模拟了大尺度天体结构之后，我们将自洽地确定大尺度异常宇宙线通量及其向星际介质的泄漏。这项研究是及时的，因为它为最近对单个电离H3区域的观测以及TeV范围内宇宙射线的起源提供了解释。这些观测是最近由大面积望远镜，如冰立方等，和伽马射线天文台。作为一个固有的结果模型，我们将提供宇宙射线和中性氢通量内的冷恒星，可能托管系外行星在可居住区的天体层。所有结果将在鲁尔大学波鸿的公共服务器上公布。

项目成果

Lyman-alpha Radiation Pressure in the Heliosphere: Results from a 3D Monte Carlo Radiative Transfer Simulation

日光层中的莱曼-α 辐射压力：3D 蒙特卡罗辐射传输模拟的结果

• DOI: 10.1088/1742-6596/642/1/012007
• 发表时间: 2015
• 期刊: Journal of Physics: Conference Series
• 作者: B. Fayock;G. P. Zank;J. Heerikhuisen;C. R. Gilbert;K. Scherer
• 通讯作者: K. Scherer

The IBEX ribbon as a signature of the inhomogeneity of the local interstellar medium

IBEX 带作为局部星际介质不均匀性的标志

• DOI: 10.1051/0004-6361/201322064
• 发表时间: 2014
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: H. Fichtner;K. Scherer;F. Effenberger;J. Zønnchen;N. Schwadron;D. J. McComas;David J.
• 通讯作者: David J.

Heliosheath Processes and the Structure of the Heliopause: Modeling Energetic Particles, Cosmic Rays, and Magnetic Fields

• DOI: 10.1007/s11214-017-0354-8
• 发表时间: 2016-12
• 期刊: Space Science Reviews
• 影响因子: 10.3
• 作者: N. Pogorelov;H. Fichtner;A. Czechowski;A. Lazarian;B. Lembége;J. A. Roux;Marius Potgieter;K. Scherer;E. Stone;R. D. Strauss;T. Wiengarten;P. Wurz;G. Zank;Ming Zhang

Ionization rates in the heliosheath and in astrosheaths - Spatial dependence and dynamical relevance

日鞘和星鞘中的电离率 - 空间依赖性和动力学相关性

• DOI: 10.1051/0004-6361/201321151
• 发表时间: 2014
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: K. Scherer;H. Fichtner;H. J. Fahr;M. Bzowski;S. E. S.Ferreira
• 通讯作者: S. E. S.Ferreira

Origin of the Differential Fluxes of Low-energy Electrons in the Inner Heliosheath

日鞘内低能电子微分通量的起源

• DOI: 10.3847/2041-8213/aa8def
• 发表时间: 2017
• 期刊: The Astrophysical Journal Letters
• 作者: H. J. Fahr;S. M. Krimigis;H. Fichtner;K. Scherer;A. Sylla;S. E. S. Ferreira;M. S. Potgieter
• 通讯作者: M. S. Potgieter