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《天文和天体物理学研究(英文版)》 2014-01
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Braking PSR J1734–3333 with a possible fall-back disk

Xiong-Wei Liu;Ren-Xin Xu;Guo-Jun Qiao;Jin-Lin Han;Hao Tong;School of Physics,China West Normal University;School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University;National Astronomical Observatories,Chinese Academy of Sciences;Xinjiang Astronomical Observatory,Chinese Academy of Sciences;  
The very small braking index of PSR J1734–3333, n = 0.9 ± 0.2, chal- lenges the current theories of braking mechanisms in pulsars. We present a possible interpretation that this pulsar is surrounded by a fall-back disk and braked by it. A modified braking torque is proposed based on the competition between the magnetic energy density of the pulsar and the kinetic energy density of the fall-back disk. With this torque, a self-similar disk can fit all the observed parameters of PSR J1734–3333 with natural initial values of parameters. In this regime, the star will evolve to the re- gion having anomalous X-ray pulsars and soft gamma repeaters in the P ˙P diagram in about 20 000 years and stay there for a very long time. The mass of the disk around PSR J1734–3333 in our model is about 10M⊕, similar to the observed mass of the disk around AXP 4U 0142+61.
【Fund】: Supported by the National Natural Science Foundation of China
【CateGory Index】: P145.6
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