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Resonant Conversion of Photon Modes Due to Vacuum Polarization in a Magnetized Plasma: Implications for X-Ray Emission from Magnetars | | Dong Lai
; Wynn C.G. Ho
; | | Date: |
8 Aug 2001 | | Subject: | astro-ph | | Affiliation: | Cornell | | Abstract: | It is known that vacuum polarization can modify the photon propagation modes in the atmospheric plasma of a strongly magnetized neutron star. A resonance occurs when the effect of vacuum polarization on the photon modes balances that of the plasma. We show that a photon (with energy $Ego$ a few keV) propagating outward in the atmosphere can convert from one polarization mode into another as it traverses the resonant density, $
ho_{res}simeq Y_e^{-1}eta^{-2}(B/10^{14} G)^2(E/1 keV)^2$ g cm$^{-3}$, where $Y_e$ is the electron fraction, and $etasim 1$ is a slowly varying function of the magnetic field $B$. The physics of this mode conversion is analogous to the Mikheyev-Smirnov-Wolfenstein mechanism for neutrino oscillation. Because the two photon modes have vastly different opacities in the atmosphere, this vacuum-induced mode conversion can significantly affect radiative transport and surface emission from strongly magnetized neutron stars. | | Source: | arXiv, astro-ph/0108127 | | Services: | Forum | Review | PDF | Favorites | |
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