What makes magnetars (as well as normal pulsars) radio laud?

Mar 25, 2014, 4:00 PM
15m

Speaker

Prof. George Melikidze (J. Kepler Institute of Astronomy, University of Zielona Gora, Poland)

Description

We present circumstances that should be fulfilled in the magnetosphere of the neutron stars to “switch” the mechanism for radio emission on. We claim that the curvature of magnetic field lines at the stellar surface is the most influential factor affecting the radio emission process. The most plausible mechanism for the radio emission which most probably is the coherent curvature radiation requires creation of a secondary plasma with the proper parameters (density, Lorentz factor etc.). Such a plasma can be only created if the curvature radius of the surface magnetic field lines is significantly less than 10^8 cm which is a canonical value for the purely dipole magnetic field. Corresponding scenarios that cause the significant increase of the curvature in pair creation regions for magnetars and pulsars differ very much. Then further in the radio emission region, the plasma instabilities lead to the coherent curvature radiation. We discuss possible processes that can affect the curvature and present observational evidences that support our model.

Primary author

Prof. George Melikidze (J. Kepler Institute of Astronomy, University of Zielona Gora, Poland)

Co-authors

Dr Andrzej Szary (J. Kepler Institute of Astronomy, University of Zielona Gora, Poland) Janusz Gil Ulrich R.M.E. Geppert

Presentation materials