J. G. Coelho, M. Malheiro
SGRs/AXPs are assumed to be a class of neutron stars (NS) powered by magnetic energy and not by rotation, as normal radio pulsars. However, the recent discovery of radio-pulsed emission in four of this class sources, where the rotational energy $\dot{E}_{\rm rot}$ is larger than the X-ray luminosity $L_X$ during the quiescent state - as in normal pulsars - opens the question of the nature of these radio SGRs/AXPs in comparison to the others of this class. In this work, we show that the radio AXPs obey an linear log-log relation between $L_X$ and $\dot{E}_{\rm rot}$, very similar to the one of normal pulsars, a correlation not seen for the others SGRs/AXPs. This results, suggest a different nature between the radio emitting AXPs comparing to the others SGRs/AXPs.
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http://arxiv.org/abs/1303.0863
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