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.

arXiv commentReplaced with the accepted version

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

Abstract

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