Pulsating magneto-dipole radiation of a quaking neutron star powered by energy of Alfvn seismic vibrations  

作　　者：Sergey Bastrukov Jun-Wei Yu Ren-Xin Xu Irina Molodtsova 

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China [2]Joint Institute for Nuclear Research, 141980 Dubna, Russia

出　　处：《Research in Astronomy and Astrophysics》2011年第9期1085-1092,共8页天文和天体物理学研究（英文版）

基　　金：supportde by the National Natural Science Foundation of China(Grant Nos.10935001 and 10973002);the National Basic Research Program of China(Grant No.2009CB824800);the John Templeton Foundation

摘　　要：We compute the characteristic parameters of the magneto-dipole radiation of a neutron star undergoing torsional seismic vibrations under the action of Lorentz restoring force about an axis of a dipolar magnetic field experiencing decay. After a brief outline of the general theoretical background of the model of a vibration-powered neutron star, we present numerical estimates of basic vibration and radiation characteristics, such as frequency, lifetime and luminosity, and investigate their time dependence on magnetic field decay. The presented analysis suggests that a gradual decrease in frequencies of pulsating high-energy emission detected from a handful of currently monitored AXP/SGR-like X-ray sources can be explained as being produced by the vibration-powered magneto-dipole radiation of quaking magnetars.We compute the characteristic parameters of the magneto-dipole radiation of a neutron star undergoing torsional seismic vibrations under the action of Lorentz restoring force about an axis of a dipolar magnetic field experiencing decay. After a brief outline of the general theoretical background of the model of a vibration-powered neutron star, we present numerical estimates of basic vibration and radiation characteristics, such as frequency, lifetime and luminosity, and investigate their time dependence on magnetic field decay. The presented analysis suggests that a gradual decrease in frequencies of pulsating high-energy emission detected from a handful of currently monitored AXP/SGR-like X-ray sources can be explained as being produced by the vibration-powered magneto-dipole radiation of quaking magnetars.

关 键 词：neutron stars -- torsion Alfv6n vibrations -- vibration powered radiation -- magnetic field decay -- magnetars 

分 类 号：P162[天文地球—天文学]