Characteristics of Emission Non-nulling Pulsars Through Simulation  

作　　者：Rai Yuen 

机构地区：[1]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [2]Xinjiang Key Laboratory of Radio Astrophysics,Chinese Academy of Sciences,Urumqi 830011,China [3]Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Nanjing 210008,China [4]SIfA,School of Physics,University of Sydney,Sydney,NSW2006,Australia

出　　处：《Research in Astronomy and Astrophysics》2024年第4期91-102,共12页天文和天体物理学研究（英文版）

基　　金：supported by the National SKA Program of China No.2020SKA0120200;the National Key Program for Science and Technology Research and Development No.2022YFC2205201;the National Natural Science Foundation of China(NSFC,grant Nos.12288102,12041303,and 12041304);the Major Science and Technology Program of Xinjiang Uygur Autonomous Region No.2022A03013-2;the open program of the Key Laboratory of Xinjiang Uygur Autonomous Region No.2020D04049。

摘　　要：We investigate the population and several properties of radio pulsars whose emission does not null(non-nulling)through simulation of a large pulsar sample.Emission from a pulsar is identified as non-nulling if(i)the emission does not cease across the whole pulse profile,and(ii)the emission is detectable.For(i),we adopt a model for switching in the plasma charge density,and emission persists if the charge density is non-zero.For(ii),we assume that detectable emission originates from source points where it is emitted tangentially to the magnetic field-line and parallel to the line-of-sight.We find that pulsars exhibiting non-nulling emission possess obliquity angles with an average of 42°.5,and almost half the samples maintain a duty cycle between 0.05 and 0.2.Furthermore,the pulsar population is not fixed but dependent on the obliquity angle,with the population peaking at 20°.In addition,three evolutionary phases are identified in the pulsar population as the obliquity angle evolves,with the majority of samples having an obliquity angle between 20°and 65°.Our results also suggest that emission from a pulsar may evolve between nulling and non-nulling during its lifetime.

关 键 词：radiation mechanisms:non THERMAL stars:neutron (stars:)pulsars:general 

分 类 号：P14[天文地球—天体物理]