射电星系喷流准直机制研究进展

Progress in the Study of the Jet Collimation Mechanism of Radio Galaxies

射电星系是射电噪活动星系核(AGN)的一个重要子类,相对论性的射电喷流是其典型的观测特征之一。射电喷流的加速过程、准直机制以及磁场所起的作用一直是天文学家关注的重点。近年来,随着高分辨率VLBI观测技术的发展,利用射电天文观测仪器已经能够探测到AGN核心区域,从而能够研究喷流的内部结构和物理过程。得益于此,天文学家在近邻射电星系喷流准直机制的观测研究方面取得了重大进展。首先介绍了主流的喷流形成模型,之后通过典型的研究案例,对FR-I和FR-II两类射电星系准直机制研究的最新进展进行阐述,最后对射电星系喷流准直机制研究进行了总结和展望。

Radio galaxies are an important subclass of radio-loud active galactic nuclei(AGN),and relativistic radio jets are one of its typical observational features.The acceleration process of radio jets,the collimation mechanism and the role of magnetic field have been studied extensively by astronomers.In recent years,with the development of high-resolution VLBI observational techniques,radio astronomical observations have been able to probe the nuclear region of nearby AGN,which enables the study of the internal structure and physical processes of the jets.As a result,astronomers have made great progress in the observational study of jet collimation mechanisms in nearby radio galaxies.First,several mainstream jet production models are presented,followed by a review of the recent progress in the study of the collimation mechanism of FR-I and FR-II radio galaxies by presenting typical case studies.Finally,we make a summary and give a short prospect for the future study of jet collimation mechanism in radio galaxies.