D. L. Cáceres, S. M. de Carvalho, J. G. Coelho, R. C. R. de Lima, Jorge A. Rueda; Thermal X-ray emission from massive, fast rotating, highly magnetized white dwarfs. Mon Not R Astron Soc 2017; 465 (4): 4434-4440. doi: 10.1093/mnras/stw3047
There is solid observational evidence on the existence of massive, M ∼ 1 M⊙, highly magnetized white dwarfs (WDs) with surface magnetic fields up to B ∼ 109 G. We show that, if in addition to these features, the star is fast rotating, it can become a rotation-powered pulsar-like WD and emit detectable high-energy radiation. We infer the values of the structure parameters (mass, radius, moment of inertia), magnetic field, rotation period and spin-down rates of a WD pulsar death-line. We show that WDs above the death-line emit blackbody radiation in the soft X-ray band via the magnetic polar cap heating by back flowing pair-created particle bombardment and discuss as an example the X-ray emission of soft gamma-repeaters and anomalous X-ray pulsars within the WD model.