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Title:
A 700 Year-old Pulsar in the Supernova Remnant Kesteven 75
Authors:
Gotthelf, E. V.; Vasisht, G.; Boylan-Kolchin, M.; Torii, K.
Affiliation:
AA(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027; , ), AB(Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109; ), AC(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027; , ), AD(Space Utilization Research Program, Tsukuba Space Center, National Space Development Agency of Japan, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan; )
Publication:
The Astrophysical Journal, Volume 542, Issue 1, pp. L37-L40. (ApJL Homepage)
Publication Date:
10/2000
Origin:
UCP
ApJ Keywords:
Stars: Pulsars: Individual: Alphanumeric: PSR J1846-0258, Stars: Individual: Alphanumeric: AX J184624.5-025828, Stars: Neutron, Stars: Supernovae: Individual: Name: Kesteven 75, X-Rays: General
DOI:
10.1086/312923
Bibliographic Code:
2000ApJ...542L..37G

Abstract

Since their discovery 30 years ago, pulsars have been understood to be neutron stars born rotating rapidly (~10-100 ms). These neutron stars are thought to be created in supernova explosions involving massive stars, which give rise to expanding supernova remnants (SNRs). With over 220 Galactic SNRs known and over 1200 radio pulsars detected, it is quite surprising that few associations between the two populations have been identified with any certainty. Here we report the discovery of a remarkable 0.3 s X-ray pulsar, PSR J1846-0258, associated with the supernova remnant Kes 75. With a characteristic age of only 723 yr, consistent with the age of Kes 75, PSR J1846-0258 is the youngest pulsar yet discovered and is being rapidly spun down by torques from a large magnetic dipole with a strength of ~=5×1013 G, just above the so-called quantum critical field. PSR J1846-0258 resides in this transitional regime where the magnetic field is hypothesized to separate the regular pulsars from the so-called magnetars. PSR J1846-0258 is evidently a rotation-powered pulsar like the Crab; however, its period, spin-down rate, and spin-down energy-to-X-ray luminosity conversion efficiency are each an order of magnitude greater, likely the consequence of its extreme magnetic field.
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