Hard X-ray spectra of anomalous X-ray pulsars

Details Hard X-ray spectra of anomalous X-ray pulsars Hard X-ray spectra of anomalous X-ray pulsars

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..101w&link_type=abstract

ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum

Astronomy and Astrophysics

Astrophysics

Pulsars, Neutron Stars, X-Ray, Magnetosphere Interactions

Scientific paper

We search for the hard X-ray tails of anomalous X-ray pulsars (AXPs) from 15-200 keV with two years of INTEGRAL/SPI and SWIFT/BAT observations. Two AXPs (1E1841-045 and 4U0142+614) are detected with SPI. And four AXPs (1E1841-045, 4U0142+614, 1RXS J1708-40 and 1E2259+586) are detected with SWIFT Their hard X-ray spectra above 20 keV can be described by a power law with photon index of ~0.5-1.5. The possible turn-off energy for 1E1841-045 has been determined at around 120 keV. This non-thermal hard emission should have a different origin from the soft thermal emission of AXPs below 10 keV. Modelling pulse profiles with the 3-D simulations of magnetosphere in magnetars compared with observed pulse profiles suggests that hard X-ray tails would originate in the close-field magnetosphere.

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