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More than meets the eye: magnetars in disguise

It has recently been proposed that radio emission from magnetars can be evaluated using a ‘fundamental plane’ in parameter space between pulsar voltage gap and ratio of X-ray luminosity L_x to rotational energy loss rate Edot. In particular, radio emission from magnetars will occur if L_x/Edot 1. Here we clarify several issues regarding this fundamental plane, including demonstrating that the fundamental plane is not uniquely defined. We also show that, if magnetars and all other pulsars are different manifestations of a unified picture of neutron stars, then pulsar radio activity (inactivity) appears to be determined by the ratio L_x/Edot ~ 1), although observational bias and uncertainty in the ratio for some sources may still invalidate this conclusion. Finally, we comment on the use of other pulsar parameters that are constructed from the three observables: spin period, P, period derivative, Pdot, and L_x.