Can Thin Disks Produce Anomalous X-Ray Pulsars?

Details Can Thin Disks Produce Anomalous X-Ray Pulsars? Can Thin Disks Produce Anomalous X-Ray Pulsars?

2003-08-26

arxiv.org/abs/astro-ph/0308455v1

Astrophys.J.599:450-456,2003

Astronomy and Astrophysics

Astrophysics

16 pages, 4 Figures, to be published in Astrophysical Journal Vol. 599, Dec. 10

Scientific paper

10.1086/379193

We investigate whether young neutron stars with fall-back disks can produce Anomalous X-Ray Pulsars (AXPs) within timescales indicated by the ages of associated supernova remnants. The system passes through a propeller stage before emerging as an AXP or a radio pulsar. The evolution of the disk is described by a diffusion equation which has self-similar solutions with either angular momentum or total mass of the disk conserved. We associate these two types of solutions with accretor and propeller regimes, respectively. Our numerical calculations of thin disk models with changing inner radius take into account the super-critical accretion at the early stages, and electron scattering and bound-free opacities with rich metal content. Our results show that, assuming a fraction of the mass inflow is accreted onto the neutron star, the fall-back disk scenario can produce AXPs for acceptable parameters.

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