Frequency dependence in the emission from subpulse drifting pulsars

作     者：韩晓红 Rai Yuen Xiao-Hong Han;Rai Yuen

作者机构：Xinjiang Astronomical ObservatoryChinese Academy of SciencesUrumqi 830011China Key Laboratory of Radio AstronomyChinese Academy of SciencesUrumqi 830011China SIfASchool of PhysicsUniversity of SydneySydneyNSW 2006Australia 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2021年第21卷第9期

页      面：153-162页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(grant Nos.U1838109,11873080 and 12041301) the open program of the Key Laboratory of Xinjiang Uygur Autonomous Region under grant No.2020D04049 the 2018 Project of Xinjiang Uygur Autonomous Region of China for Flexibly Fetching in Upscale Talents partly supported by Xiaofeng Yang’s Xinjiang Tianchi Bairen project CAS Pioneer Hundred Talents Program 

主　　题：radiation mechanisms:non-thermal pulsar:general 

摘      要：We investigate relations in the emission properties as revealed by drifting subpulses detected at different observing frequencies based on the method that incorporates the rotating carousels in pulsar magnetospheres of multiple emission *** emission state is associated with particular emission properties as determined by the drifting subpulses at a particular frequency,and different emission states obtained at different frequencies reveal the variation of emission properties across the emission *** method allows the determination of the essential radio emission properties such as the relative emission height,subpulse number,charge density and the plasma flow relative to corotation in an emission region for a particular *** apply the method to seven pulsars that exhibit subpulse drifting along single drift-band at 326 MHz and 1429 *** results show that drifting subpulses observed at different frequencies correspond to particular emission states suggesting that the pulsar emission properties are frequency *** show that emission follows the frequency-to-radius mapping for pulsars with obliquity angle?30°regardless of the sign and magnitude of the *** pulsars with long rotation periods in our sample,the circulation time for the plasma to revolve once around the magnetosphere relative to corotation increases as the rotation period increases at both frequencies,but exhibits irregularity for pulsars with short rotation *** results suggest that evolution of the obliquity angles in subpulse drifting pulsars is from large to small,and the emission region tends to be’thicker’in younger pulsars.