Resolution of the Age Discrepancies in Pulsar/SNR Associations

Details Resolution of the Age Discrepancies in Pulsar/SNR Associations Resolution of the Age Discrepancies in Pulsar/SNR Associations

2001-02-02

arxiv.org/abs/astro-ph/0102049v1

Astronomy and Astrophysics

Astrophysics

Six pages and two figures; to appear in the proceedings of the Rome2000 mini workshop on SGRs and AXPs, to be published in Mem

Scientific paper

Pulsars associated with supernova remnants (SNRs) are valuable because they provide constraints on the mechanism(s) of pulsar spin-down. Here we discuss two SNR/pulsar associations in which the SNR age is much greater than the age of the pulsar obtained by assuming pure magnetic dipole radiation (MDR) spin-down. The PSR B1757-24/SNR G5.4-1.2 association has a minimum age of ~40 kyr from proper motion upper limits, yet the MDR timing age of the pulsar is only 16 kyr, and the newly discovered pulsar PSR J1846-0258 in the >2 kyr old SNR Kes 75 has an MDR timing age of just 0.7 kyr. These and other pulsar/SNR age discrepancies imply that the pulsar spin-down torque is not due to pure MDR, and we discuss a model for the spin-down of the pulsars similar to the ones recently proposed to explain the spin-down of soft gamma-ray repeaters and anomalous x-ray pulsars.

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