Abstract
We pewsent a Monte Carlo simulation of radiative transfer in magnetar atmospheres taking into account the effects of vacuum polarization, electron and proton scattering, and free‐free absorption. We calculate the atmosphere model with the magnetic field perpendicular and also tilted with respect to the neutron star surface, and show that the average spectrum does not strongly depend on the orientation of the magnetic field. We investigate the region of the parameter space where the vacuum absorption‐like feature appears in the spectrum and analyze the shape of the proton cyclotron line. The existence of the vacuum polarization feature should be a general property of soft gamma‐ray repeaters burst spectra, provided that the energy release takes place at the sufficiently dense region, and the atmosphere scaleheight is large enough. We discuss the existence of such a feature in recent observational data on these sources.
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