http://arxiv.org/abs/1604.01231
In a plasma filled magnetosphere, in addition to providing a torque to brake down the pulsar, the magnetosphere will also generate a torque to align the pulsar magnetic and rotational axes. The evolution of pulsar inclination angle in the wind braking model is calculated. In the wind braking model, the oblique pulsar tends to align. The pulsar alignment will also affect the spin-down behavior. Braking index will increase firstly and then decrease as the pulsar evolving from the magneto-dipole radiation dominated case to the wind braking dominated case. Braking index may be larger than $3$ in the early time. And during the following long time, braking index will be always smaller than $3$. This can explain braking index observations of larger than $3$ and smaller than $3$. Besides, the pulsar will evolve downwards straightly to the death valley after pulsar death in the $P-\dot{P}$ diagram. This may explain the observed maximum spinning period of pulsars. And the long-term evolution of pulsars in the wind braking model may link different groups of pulsars and contribute to unification of different kinds of pulsar-like objects. From the rotational evolution point of view, there may be links between high$-$$\dot{P}$ magnetars, X$-$ray dim isolated neutron stars, and low$-$$\dot{P}$ magnetars. The rotation radio transient may be pulsars on the verge of death.
F. Kou, H. Tong and N. Wang
Wed, 6 Apr 16
36/63
Comments: 7 pages, 9 figures, submitted
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