Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis
Göğüş, Ersin and Güver, Tolga and Özel, Feryal (2007) Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis. (Submitted)
Official URL: http://www.journals.uchicago.edu/ApJ/
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 ± 0.02) × 10^14 G, a surface temperature of kT = 0.309 ± 0.001 keV and a scattering optical depth of a few in the magnetosphere. These values do not vary between observations due to the stability of the source within the window of the observations. The detailed fits yield chi^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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