切仑科夫线状辐射与类星体的宽发射线起源探讨

Cerenkov Line-like Radiation and the Origin of Broad Lines in Quasars

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.

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. ~rthermore, 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.