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Modelling lightcurves and spectra of transient Anomalous X-ray Pulsars

By S. Zane, A. Albano, R. Turolla, G. L. Israel, L. Nobili and L. Stella

Abstract

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

Topics: Astrophysics - High Energy Astrophysical Phenomena
Year: 2011
DOI identifier: 10.1063/1.3629501
OAI identifier: oai:arXiv.org:1103.0955
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