Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis

Tolga Guver; Feryal Ozel; Ersin Gogus

doi:10.1086/525840

paper

Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis

arXiv:0705.3982 · doi:10.1086/525840

Abstract

We analyze archival Chandra and XMM-Newton data of 4U 0142+61 within the context of the Surface Thermal Emission and Magnetospheric Scattering model. We show that 4U 0142+61 spectrum can be fit very well with this physical model that contains only four parameters. The system parameters can be tightly constrained from the fits, yielding a surface magnetic field strength of B=(4.75 \pm 0.02)x 10^{14} G, a surface temperature of kT = 0.309 \pm 0.001 $k e V an d a sc a tt er in g o pt i c a l d e pt h o f a f e w in t h e ma g n e t os p h er e . T h ese v a l u es d o n o t v a r y b e tw ee n o b ser v a t i o n s d u e t o t h es t abi l i t y o f t h eso u r ce w i t hin t h e w in d o w o f t h eo b ser v a t i o n s . T h e d e t ai l e df i t sy i e l d$ χ^2$ values that are statistically much better than the traditionally employed blackbody+power-law and two blackbody fits. The spectroscopically measured surface magnetic field strength is higher than, but within, the theoretical uncertainties of the value inferred from the dipole spindown formula.

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Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis

Abstract

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