发表机构
University of Liège; Indian Institute for Space science and Technology (IIST); Instituto Argentino de Radioastronomía; Peking University; Chalmers University of Technology（列日大学; 印度空间科学与技术学院; 阿根廷射电天文学研究所; 北京大学; 查尔姆斯理工大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文探讨自由-自由吸收对粒子加速碰撞风双星射电频谱的观测偏差，指出该吸收掩盖同步辐射特征，限制确定此类系统中粒子加速器真实比例的能力。
AI 中文摘要
对参与粒子加速的双星及更高重数系统中的大质量恒星的研究，是大质量恒星物理、激波物理和银河宇宙射线天体物理学交叉领域的一个关键课题。从观测角度来看，射电测量是我们通过其同步辐射射电发射来识别这些系统的主要工具。在迄今已知的54个此类系统中，除两个外，其余均是通过其非热射电发射发现的。然而，识别这些系统并非易事。主要挑战在于自由-自由吸收，它可能掩盖同步辐射特征并阻碍探测。本文总结了我们对这些系统理解的最新进展，特别关注自由-自由吸收引入的强烈观测偏差。这种偏差显著限制了我们确定碰撞风双星中粒子加速器真实比例的能力。
英文摘要
The study of massive stars in binary and higher-multiplicity systems that participate in particle acceleration is a key topic at the crossroads of massive star physics, shock physics, and galactic cosmic ray astrophysics. From an observational perspective, radio measurements are our pri- mary tool for identifying these systems through their synchrotron radio emission. Out of the 54 such systems known to date, all but two have been discovered via their non-thermal radio emission. However, identifying these systems is not straightforward. The main challenge lies in free-free absorption, which can obscure the synchrotron signature and hinder detection. This paper summarizes recent developments in our understanding of these systems, with a particular focus on the strong observational bias introduced by free-free absorption. This bias significantly limits our ability to determine the true fraction of particle accelerators among colliding-wind binaries.
Comments9 pages, 3 figures, to appear in the Proceedings of the 4th BINA workshop "Moving forward with the Indo-Belgian cooperation in Astronomy", accepted for publication in the Bulletin of the Liège Royal Society of Sciences
