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Explaining radio emission of magnetars via rotating and oscillating magnetospheres of neutron stars

Authors

  • Viktoriya S. Morozova,

    Corresponding author
    1. Institute of Nuclear Physics, Ulughbek, Tashkent 100214, Uzbekistan
    2. Ulugh Beg Astronomical Institute, Astronomicheskaya 33, Tashkent 100052, Uzbekistan
    3. The Abdus Salam International Centre for Theoretical Physics, 34151 Trieste, Italy
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  • Bobomurat J. Ahmedov,

    1. Institute of Nuclear Physics, Ulughbek, Tashkent 100214, Uzbekistan
    2. Ulugh Beg Astronomical Institute, Astronomicheskaya 33, Tashkent 100052, Uzbekistan
    3. The Abdus Salam International Centre for Theoretical Physics, 34151 Trieste, Italy
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  • Olindo Zanotti

    1. Max-Planck-Institut finline imager Gravitationsphysik, Albert-Einstein-Institut, 14476 Golm, Germany
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E-mail: moroz_vs@yahoo.com

ABSTRACT

We investigate the conditions for radio emission in rotating and oscillating magnetars by focusing on the main physical processes determining the position of their death lines in the inline image diagram, i.e. of those lines that separate the regions where the neutron star may be radio loud or radio quiet. After using the general relativistic expression for the electromagnetic scalar potential in the magnetar magnetosphere, we find that larger compactness parameters of the star as well as larger inclination angles between the rotation axis and the magnetic moment produce death lines well above the majority of known magnetars. This is consistent with the observational evidence of no regular radio emission from the magnetars in the frequency range typical for the ordinary pulsars. On the contrary, when oscillations of the magnetar are taken into account, the death lines shift downward and the conditions necessary for the generation of radio emission in the magnetosphere are met. Present observations showing a close connection between the burst activity of magnetars and the generation of the radio emission in the magnetar magnetosphere are naturally accounted for within our interpretation.

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