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29 March 2024 |
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The Pulsed Spectra of Two Extraordinary Pulsars | Mallory S.E. Roberts
; Scott M. Ransom
; Fotis Gavriil
; Victoria M. Kaspi
; Pete Woods
; Alaa Ibrahim
; Craig Markwardt
; Jean H. Swank
; | Date: |
8 Dec 2003 | Subject: | astro-ph | Abstract: | We report on X-ray monitoring of two isolated pulsars within the same RXTE field of view. PSR J1811-1925 in the young supernova remnant G11.2-0.3 has a nearly sinusoidal pulse profile with a hard pulsed spectrum (photon index ~1.2). The pulsar is a highly efficient (~ 1% of spin-down energy) emitter of 2-50 keV pulsed X-rays despite having a fairly typical B ~ 2e12 G magnetic field. PSR J1809-1943/XTE J1810-197 is a newly discovered slow (P=5.54 s), apparently isolated X-ray pulsar which increased in flux by a factor of ~100 in 2003 January. Nine months of monitoring observations have shown a decrease in pulsed flux of ~ 30% without a significant change in its apparently thermal spectrum (kT ~0.7 keV) or pulse profile. During this time, the spin-down torque has fluctuated by a factor of ~ 2. Both the torque and the flux have remained steady for the last 3 months, at levels consistent with a magnetar interpretation. | Source: | arXiv, astro-ph/0401111 | Services: | Forum | Review | PDF | Favorites |
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