On the origin of hyperfast neutron stars

TL;DR

This paper suggests hyperfast neutron stars originate from symmetric supernovae of high-velocity stars ejected through dynamical encounters in star clusters, which may also produce hypervelocity stars.

Contribution

It introduces a new hypothesis linking hyperfast neutron stars to dynamical ejections of massive stars in star cluster cores.

Findings

Hyperfast neutron stars can result from symmetric supernovae of ejected high-velocity stars.

Star cluster cores can produce hypervelocity stars moving at ~1000 km/s.

The hypothesis connects neutron star origins with star cluster dynamics.

Abstract

We propose an explanation for the origin of hyperfast neutron stars (e.g. PSR B1508+55, PSR B2224+65, RX J0822-4300) based on the hypothesis that they could be the remnants of a symmetric supernova explosion of a high-velocity massive star (or its helium core) which attained its peculiar velocity (similar to that of the neutron star) in the course of a strong three- or four-body dynamical encounter in the core of a young massive star cluster. This hypothesis implies that the dense cores of star clusters (located either in the Galactic disk or near the Galactic centre) could also produce the so-called hypervelocity stars -- the ordinary stars moving with a speed of ~1000 km/s.