Journal Article

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

Viktoriya S. Morozova, Bobomurat J. Ahmedov and Olindo Zanotti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 3, pages 2147-2155
Published in print January 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19866.x
Explaining radio emission of magnetars via rotating and oscillating magnetospheres of neutron stars

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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 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.

Keywords: MHD; stars: magnetars; stars: neutron; stars: oscillations; pulsars: general

Journal Article.  5328 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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