Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.3215g&link_type=abstract
American Astronomical Society, HEAD Meeting #5, #32.15; Bulletin of the American Astronomical Society, Vol. 32, p.1238
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the discovery of PSR J1846-0258, a remarkable X-ray pulsar associated with the young supernova remnant Kes 75. We find a highly significant signal at a period of ~ 0.3 s with a broad, symmetric single pulse profile. From several archival RXTE and ASCA pointings of the region we are able to localize the source of the pulsations to Kes 75 and measure a period derivative of 7.1 x 10-12 s/s. With a characteristic age of only 723 yr, consistent with the age of Kes 75, PSR J1846-0258 is the youngest pulsar yet discovered. This pulsar is being spun down rapidly by torques from a large magnetic dipole of strength ~= 5x 1013 G, just above the so-called quantum critical field BQED = m2ec^3/e{\hbar}. 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 Crab-like pulsar, however, its period, spin-down rate, spin-down conversion efficiency, are each an order-of-magnitude greater, likely the result of its equally extreme magnetic field. Unlike its older cousin, the Crab, the Kes 73 system is one of those rare examples of a central plerion in a shell-type SNR; it provides strong evidence that neutron stars are born in supernovae explosions. The research is supported by NASA LTSA grant NAG5--7935.
Boylan-Kolchin Michael
Gotthelf Eric Van
Torii Kazufumi
Vasisht Gautam
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