Evolving into Magnetars from Normal Pulsars with a Low Braking Index  

作　　者：陈文聪 

机构地区：[1]Department~of Physics and Information Engineering, Shangqiu Normal University, Shangqiu 476000

出　　处：《Chinese Physics Letters》2009年第5期277-280,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10873011, and the Program for Science and Technology Innovation Talents in the Universities of the Henan Province.

摘　　要：Anomalous x-ray pulsars （AXPs） and soft gamma-ray repeaters （SCRs） are believed to be candidates for magnetars, and they are powered by the decay of ultra-strong magnetic fields of〉 1014 C. From the modified spin-down relation of pulsars P ∝P^2-n, we find that the Vela pulsar would evolve into the classes of magnetars under some assumptions that pulsars lose their rotational energy only by magnetic dipole radiation and the braking index is a constant. Our rough calculation indicates that only pulsars with n - 1.3 - 1.6 can evolve into magnetars. Pulsars like Vela with a low braking index may be the progenitors of AXPs and SCRs. Regarding the mechanism evolved into magnetars, we suggest that pulsars＇ surface magnetic field component may be increased by frequent glitches.Anomalous x-ray pulsars （AXPs） and soft gamma-ray repeaters （SCRs） are believed to be candidates for magnetars, and they are powered by the decay of ultra-strong magnetic fields of〉 1014 C. From the modified spin-down relation of pulsars P ∝P^2-n, we find that the Vela pulsar would evolve into the classes of magnetars under some assumptions that pulsars lose their rotational energy only by magnetic dipole radiation and the braking index is a constant. Our rough calculation indicates that only pulsars with n - 1.3 - 1.6 can evolve into magnetars. Pulsars like Vela with a low braking index may be the progenitors of AXPs and SCRs. Regarding the mechanism evolved into magnetars, we suggest that pulsars＇ surface magnetic field component may be increased by frequent glitches.

分 类 号：P145.6[天文地球—天体物理] U463.5[天文地球—天文学]