Early Accretion Onset in Long-Period Isolated Pulsars

Abstract

We model long-term magneto-rotational evolution of isolated neutron stars with long initial spin periods. This analysis is motivated by the recent discovery of young long-period neutron stars observed as periodic radio sources: PSR J0901-4046, GLEAM-X J1627-52, and GPM J1839-10. Our calculations demonstrate that for realistically rapid spin-down during the propeller stage all isolated neutron stars with velocities $\lesssim100$ km s$^{-1}$ are able to reach the stage of accretion from the interstellar medium within a few billion years. If neutron stars with long initial spin periods form a relatively large fraction of all Galactic neutron stars then the number of isolated accretors is sufficiently larger than it has been predicted by previous studies.Comment: 12 pages, 2 figures, submitted to PAS