Correlation between pulsar glitch and emission

摘要

Pulsar glitches are sudden increases in the spin frequency, which are believed to be caused by the abrupt transfer of angular momentum from the interior superfluid to the crust of neutron star. These events offer an opportunity of investigating the interior structure of pulsars. Observations with Nanshan Radio telescope show that the observational features of glitches are varied and their post-glitch behaviors show different decay. In addition, twelve glitches in five pulsars are detected to show multi exponential terms in one decay process, implying that fast decay could be missed due to the observation gap. For the latest Vela glitch in 2016, the coupling parameter has a value of 0.08 due to a long waiting time, therefor the core superfluid is probably not involved in this event. There are evidence to support the correlations between pulsar glitch and emission. We detected PSR B2035+36 to undergo a glitch with a frequency increase of ?v ~ 12.4(5) nHz around MJD 52950. The post-glitch behavior is unusual, where the spin-down rate increase persistently over 800 d after the glitch. Besides, the pulse profile became narrower and the pulsar began to switch between two emission modes. It indicates that there should be a connection between magnetospheric behavior and glitch activity.