Modelling lightcurves and spectra of transient Anomalous X-ray Pulsars

Details Modelling lightcurves and spectra of transient Anomalous X-ray Pulsars Modelling lightcurves and spectra of transient Anomalous X-ray Pulsars

2011-03-04

arxiv.org/abs/1103.0955v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 Pages, 7 Figures. To be published in the proceedings of "Astrophysics of Neutron Stars 2010", 1-5 August 2010, Cesme, Turkey

Scientific paper

We present the first detailed joint modelling of both the timing and spectral properties during the outburst decay of transient anomalous X-ray pulsars. We consider the two sources XTE J1810-197 and CXOU J164710.2-455216, and describe the source decline in the framework of a twisted magnetosphere model, using Monte Carlo simulations of magnetospheric scattering and mimicking localized heat deposition at the NS surface following the activity. Our results support a picture in which a limited portion of the star surface close to one of the magnetic poles is heated at the outburst onset. The subsequent evolution is driven both by the cooling/varying size of the heated cap and by a progressive untwisting of the magnetosphere.

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