首页|Characteristics of Emission Non-nulling Pulsars Through Simulation

Characteristics of Emission Non-nulling Pulsars Through Simulation

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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.

radiation mechanisms:nonthermalstars:neutron(stars:)pulsars:general

Rai Yuen

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Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China

Xinjiang Key Laboratory of Radio Astrophysics,Chinese Academy of Sciences,Urumqi 830011,China

Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Nanjing 210008,China

SIfA,School of Physics,University of Sydney,Sydney,NSW 2006,Australia

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National SKA Program of ChinaNational Key Program for Science and Technology Research and DevelopmentNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Major Science and Technology Program of Xinjiang Uygur Autonomous Regionopen program of the Key Laboratory of Xinjiang Uygur Autonomous RegionOperation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility InstrumentsMinistry of Finance of China(MOF)CAS

2020SKA01202002022YFC22052011228810212041303120413042022A03013-22020D04049

2024

10.1088/1674-4527/ad2ee0

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(4)