Pulsar spin-velocity alignment from single and binary neutron star progenitors - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




Pulsar spin-velocity alignment from single and binary neutron star progenitors - Astrophysics > Solar and Stellar Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The role of binary progenitors of neutron stars in the apparent distributionof space velocities and spin-velocity alignment observed in young pulsars isstudied. A Monte-Carlo synthesis of pulsar population from single and binarystars with different assumptions about the NS natal kick model directiondistribution, amplitude, and kick reduction in binary progenitors whichexperienced mass exchange due to Roche lobe overflow with initial masses on themain sequence from the range 8-11 $M \odot$ is performed. The calculatedspin-velocity alignment distributions are compared with observational dataobtained from radio polarization measurements. The observed space velocity ofpulsars is found to be mostly shaped by the natal kick velocity form and itsamplitude; the fraction of binaries is not important here for reasonably largekicks. The distribution of kick direction relative to the spin axis during theformation of a NS is found to affect strongly the spin-velocity correlation ofpulsars. Comparison with observed pulsar spin-velocity angles favours asizeable fraction of binary progenitors and the kick-spin angle $\sim5-20^\circ$. The form of the initial binary mass ratio distribution does notaffect our results.



Author: A.G. Kuranov 1, S.B. Popov 1, K.A. Postnov 1,2 1-Sternberg Astronomical Institute, 2-Department of Physics Moscow State Universit

Source: https://arxiv.org/







Related documents