Estimate of an environmental magnetic field of fast radio bursts  

作　　者：Wei-Li Lin Zi-Gao Dai 

机构地区：[1]School of Astronomy and Space Science, Nanjing University [2]Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education

出　　处：《Research in Astronomy and Astrophysics》2016年第3期11-16,共6页天文和天体物理学研究（英文版）

基　　金：supported by the National Basic Research Program ("973" Program) of China (Grant No. 2014CB845800);the National Natural Science Foundation of China (Grant No. 11033002)

摘　　要：Fast radio bursts （FRBs） are a type of newly-discovered transient astronomical phenomenon. They have short durations, high dispersion measures and a high event rate. However, due to unknown dis- tances and undetected electromagnetic counterparts at other wavebands, it is difficult to further investigate FRBs. Here we propose a method to study their environmental magnetic field using an indirect method. Starting withdispersion measures and rotation measures （RMs）, we try to obtain the parallel magnetic field component ^-B ││ which is the average value along the line of sight in the host galaxy. Because both RMs and redshifls are now unavailable, we demonstrate the dependence of ^-B ││ on these two separate quantities. This result, if the RM and redshift of an FRB are measured, would be expected to provide a clue towards understanding an environmental magnetic field of an FRB.Fast radio bursts （FRBs） are a type of newly-discovered transient astronomical phenomenon. They have short durations, high dispersion measures and a high event rate. However, due to unknown dis- tances and undetected electromagnetic counterparts at other wavebands, it is difficult to further investigate FRBs. Here we propose a method to study their environmental magnetic field using an indirect method. Starting withdispersion measures and rotation measures （RMs）, we try to obtain the parallel magnetic field component ^-B ││ which is the average value along the line of sight in the host galaxy. Because both RMs and redshifls are now unavailable, we demonstrate the dependence of ^-B ││ on these two separate quantities. This result, if the RM and redshift of an FRB are measured, would be expected to provide a clue towards understanding an environmental magnetic field of an FRB.

关 键 词：radio continuum： general -- pulsars： general -- galaxies： magnetic fields -- Galaxy： structure 

分 类 号：P162[天文地球—天文学]