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切仑科夫线状辐射与类星体的宽发射线起源探讨
引用本文:刘当波,袁爱芳,孟宪茹,单增罗布,尤峻汉.切仑科夫线状辐射与类星体的宽发射线起源探讨[J].天文学报,2009,50(4).
作者姓名:刘当波  袁爱芳  孟宪茹  单增罗布  尤峻汉
作者单位:1. 上海交通大学物理系粒子物理宇宙学研究所,上海,200240
2. 西藏大学理学院物理系宇宙线研究所,拉萨,850000
基金项目:国家自然科学基金,高校博士点科研基金,国家重点基础研究发展计划,教育部科学技术研究重点项目 
摘    要:当具有各向同性速度分布的相对论电子穿过稠密气体区,或者轰击稠密气体区的表面时,切仑科夫效应将会产生1种特殊的原子或离子发射线,称做切仑科夫线状发射.这一预言在光学波段已由实验室的实验所证实.研究指出了切仑科夫线状辐射在类星体和赛弗特1星系的宽发射线研究中的重要性,利用此新机制有可能解决类星体研究中的一些重大且长期没有解决的疑惑.例如宽氢线之间存在的反常强度比,特别是反常Lyα/Lyβ强度比的问题.并且进一步估计了相对论电子穿过宇宙气体时所产生的各种效应的能耗的数量级,并对各种能耗进行比较,证实了切仑科夫线状发射机制在类星体和塞弗特1型星系中的有效性.

关 键 词:辐射机制  一般  线  形成  星系  类星体  赛弗特  黑洞物理

Cerenkov Line-like Radiation and the Origin of Broad Lines in Quasars
LIU Dang-bo,YUAN Ai-fang,MENG Xian-ru,DANZENG Luo-bu,YOU Jun-han.Cerenkov Line-like Radiation and the Origin of Broad Lines in Quasars[J].Acta Astronomica Sinica,2009,50(4).
Authors:LIU Dang-bo  YUAN Ai-fang  MENG Xian-ru  DANZENG Luo-bu  YOU Jun-han
Abstract:When the thermal relativistic electrons with isotropic distribution of velocities move through a dense gas region, or impinge upon the surface of a dense cloud of gas, the Cerenkov effect will produce peculiar atomic or ionic emission lines, which is called as the "Cerenkov line-like radiation". This prediction has been verified by the laboratory experiments in the optical waveband. In this paper, the importance of the Cerenkov line-like radiation in the research on broad emission lines in quasars and Seyfert 1 galaxies is pointed out. By using this mechanism, some long standing and significant puzzles in study of quasars can be solved. Furthermore, the magnitude orders of energy losses due to various effects when a relativistic electron moving through the cosmic gas are estimated and compared with each other to prove the effectiveness of the new mechanism in quasars.
Keywords:Radiation Mechanism:General  Line:Formation  Galaxies:Quasars  Seyfert  Black Hole Physics
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