Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4102v&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #41.02; Bulletin of the American Astronomical Society, Vol. 30, p.1308
Other
Scientific paper
We present the spin-down history of the recently discovered 12-s pulsar in Kes 73, 1E 1841-045 using new ASCA observations and archival GINGA and ROSAT measurements. We confirm the remarkably rapid but steady spin-down rate for this pulsar of 4.1 x 10(-11) s/s, orders of magnitude faster than the Crab-like pulsars. Most importantly, the characteristic pulsar age is consistent with the age derived for the host SNR ( ~ 2,000 yrs). The ASCA flux has remained steady and consistent with the Rosat flux measurement. The ASCA spectrum also remains unchanged, described by a steep power-law of photon index ~ 3.4, most unlike a typical Crab-like or recycled pulsar. The unusual spectral and temporal properties of 1E 1841-045 are similar to the other seemingly isolated, young anomalous X-ray pulsars; and these objects appear related to the SGRs. As an ``isolated'' NS, this pulsar is the one having the longest spin period ever observed. If these and other NS candidates like them were indeed born as fast rotators, then a mechanism must be found to slow them down to their currently observed rates. The rapid but steady spin-down of the Kes 73 pulsar suggests a possibility. The equivalent magnetic field for a rotating dipole is Bdipole =~ 3.2*E(19) (Pdot P)(1/2) ~ 8x 10(14) G, one of the highest magnetic fields observed in nature. We suggest that the pulsar in Kes 73 was born as such a ``magnetar'' ~ 2,000 yrs ago and has since spun down to a long period due to rapid dipole radiation losses; 1E 1841-045 provides the first direct evidence of a magnetar and suggests an alternative evolutionary path for young pulsars.
Dotani Tadayasu
Gotthelf Eric Van
Vasisht Gautam
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