The physics of jets and compact stars during stellar evolution: Theoretical and computational investigations

恒星演化过程中喷流和致密恒星的物理学：理论和计算研究

• 批准号: 261428-2012
• 负责人: Ouyed, Rachid
• 金额: $ 1.46万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=507309
• 关键词: physics; jets; compact; stars; during

ASTROPHYSICAL JETS: These are long, highly collimated flows, with two back-to-back jets streaming away from their central source/object. They are seen in newly born stars, compact objects (like black holes or micro-quasars), active galactic nuclei, and are associated to gamma-ray bursts, the most energetic events in the Universe. Despite their different physical scales, jets have strong morphological similarities, but questions like - what physics do they share? - or - can we find a universal mechanism of acceleration and collimation that operates in all scales? - remain a matter of debate. We employ high-performance computational studies (in 3 Dimensions) of jets from young stars carried out to unprecedented resolution and simulation scales of hundreds of Astronomical Units -- allowing for the first time a one-to-one comparison to Hubble Space Telescope observations of jets. Our goal is to study their ejection, acceleration mechanisms using the codes and visualizations tools we built and, to confront models of jets against observed jet properties. Ultimately, this work could lead to an understanding of the physics of jets and their role in the formation of stars and galaxies.

天体物理喷流：这些喷流是长的、高度准直的流，有两个背对背的喷流从其中心源/物体流出。 它们存在于新生恒星、致密天体（如黑洞或微类星体）、活跃星系核中，并与伽马射线暴（宇宙中最活跃的事件）有关。尽管它们的物理尺度不同，但喷流在形态上有很强的相似性，但问题是——它们有什么共同的物理原理？ - 或者 - 我们能否找到一种适用于所有尺度的通用加速和准直机制？ - 仍然是一个有争议的问题。 我们对年轻恒星的喷流进行了高性能计算研究（3维），以前所未有的分辨率和数百个天文单位的模拟规模进行研究——首次允许与哈勃太空望远镜对喷流的观测进行一对一的比较。我们的目标是使用我们构建的代码和可视化工具来研究它们的弹射、加速机制，并将喷气机模型与观察到的喷气机特性进行对比。最终，这项工作可能会让人们了解喷流的物理学及其在恒星和星系形成中的作用。