NDLI: The space velocities of radio pulsars

Content Provider	Springer Nature Link
Author	Logiv, A. A. Nikitina, E. B. Malov, I. F.
Copyright Year	2016
Abstract	Known models proposed to explain the high space velocities of pulsars based on asymmetry of the transport coefficients of different sorts of neutrinos or electromagnetic radiation can be efficient only in the presence of high magnetic fields (to 10$^{16}$ G) or short rotation periods for the neutron stars (of the order of 1 ms). This current study shows that the observed velocities are not correlated with either the pulsar periods or their surface magnetic fields. The initial rotation periods are estimated in a model for the magnetedipolar deceleration of their spin, aßsuming that the pulsar ages are equal to their kinematic ages. The initial period distribution is bimodal, with peaks at 5 ms and 0.5 s, and similar to the current distribution of periods. It is shown that asymmetry of the pulsar electromagnetic radiation is insufficient to give rise to additional acceleration of pulsars during their evolution after the supernova explosion that gave birth to them. The observations testify to deceleration of the motion, most likely due to the influence of the interstellar medium and interactions with nearby objects. The time scale for the exponential decrease in the magnetic field τ $_{ D }$ and in the angle between the rotation axis and magnetic moment τ $_{ ß }$ are estimated, yielding τ $_{ β }$ = 1.4 million years. The derived dependence of the transverse velocity of a pulsar on the angle between the line of sight and the rotation axis of the neutron star corresponds to the expected dependence for acceleration mechanisms associated with asymmetry of the radiation emitted by the two poles of the star.
Starting Page	193
Ending Page	203
Page Count	11
File Format	PDF
ISSN	10637729
Journal	Astronomy Reports
Volume Number	60
Issue Number	2
e-ISSN	15626881
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-02-17
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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