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Cosmic Rays in super Bubbles

超级气泡中的宇宙射线

基本信息

批准号：
286923936
负责人：
Professor Dr. Reinhard Schlickeiser
金额：
--
依托单位：
Institut für Theoretische Physik IV: Weltraum- und Astrophysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/286923936?language=en
关键词：
Cosmic Rays super Bubbles

项目摘要

A century-long standing problem in astrophysics is to explain how cosmic rays are accelerated to relativistic energies and how they diffuse in their host galaxy. Notable progress has been made on their production in supernova remnants, but the recent discovery in gamma rays, with the Fermi satellite, of a cocoon of fresh and energetic cosmic rays in the Cygnus X superbubble has disclosed an important new facet of the problem : what is the impact on particle (re-)acceleration and diff usion of the large level of turbulence generated in the superbubble medium by the activity of the numerous massive stars ? Can this turbulent phase signi cantly modify our current views on cosmic-ray transport in the Galaxy because most cosmic-ray sources are to be found in active star-forming regions ? In this project, we propose to compare two superbubbles, the few-million-year old, bursting Cygnus X bubble and the older, less energetic Orion-Eridanus superbubble near the Sun. We propose to combine our expertise on cosmic-ray transport/acceleration, on gamma -ray observations of cosmic rays, and on multi-wavelength observations of the interstellar conditions prevailing in these bubbles, in order to test a new acceleration mechanism and to revisit the impact of the turbulent bubble medium on diff erent observational cosmic-ray diagnostics, Galactic-wide and locally in the Local Superbubble.

天体物理学一个世纪以来的问题是解释宇宙射线是如何被加速到相对论能量的，以及它们是如何在宿主星系中扩散的。在超新星遗迹中产生它们方面已经取得了显著的进展，但是最近费米卫星在伽马射线中发现了天鹅座X超级气泡中的新鲜和高能宇宙射线茧，揭示了问题的一个重要的新方面：对颗粒的影响（再）由众多大质量恒星的活动在超气泡介质中产生的大尺度湍流的加速和差异？由于大多数宇宙射线源都是在活跃的恒星形成区发现的，这种湍流阶段是否会显著地改变我们目前对银河系中宇宙射线传输的看法？在这个项目中，我们建议比较两个超级气泡，一个是几百万年前破裂的天鹅座X气泡，另一个是太阳附近较老、能量较低的猎户座-波江座超级气泡。我们建议联合收割机结合我们在宇宙射线传输/加速，宇宙射线的伽马射线观测，以及这些气泡中占主导地位的星际条件的多波长观测方面的专业知识，以测试新的加速机制，并重新审视湍流气泡介质对不同观测宇宙射线诊断的影响，银河系范围内和本地超级气泡。