Magnetars and White Dwarf Pulsars

Abstract

The Anomalous X-ray Pulsars (AXPs) and Soft Gamma-ray Repeaters (SGRs) are a class of pulsars understood as neutron stars (NSs) with super strong surface magnetic fields, namely $B\gtrsim 10^{14}$ G, and for that reason are known as Magnetars. However, in the last years some SGRs/AXPs with low surface magnetic fields $B\sim (10^{12}-10^{13})$ G have been detected, challenging the Magnetar description. Moreover, some fast and very magnetic white dwarfs (WDs) have also been observed, and at least one showed X-Ray energy emission as an ordinary pulsar. Following this fact, an alternative model based on white dwarfs pulsars has been proposed to explain this special class of pulsars. In this model, AXPs and SGRs as dense and magnetized white dwarfs can have surface magnetic field $B\sim 10^7-10^{10}$ G and rotate very fast with frequencies $\Omega \sim 1$ rad/s, consistent with the observed rotation periods $P\sim (2-12)$ s.

To appear in a Special Issue of the IJMPD on Selected Papers of the III Amazonian Symposium on Physics (Eds. C. Herdeiro, E. Berti, V. Cardoso, L. C. Crispino, L. Gualtieri and U. Sperhake)

References in corpus (4)

• Magnetar-like Emission from the Young Pulsar in Kes 75
• The fundamental plane for radio magnetars
• XMM-Newton X-ray Observation of the High-Magnetic-Field Radio Pulsar PSR J1734--3333
• Similarities of SGRs with low magnetic field and white dwarf pulsars

Cited by in corpus (15)

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• A Model of White Dwarf Pulsar AR Scorpii
• Massive white dwarfs in $f(R,L_m)$ gravity
• On the nature of some SGRs and AXPs as rotation-powered neutron stars
• Orbital decay of double white dwarfs: beyond gravitational wave radiation effects
• A magnetic white-dwarf accretion model for the anomalous X-ray pulsar 4U 0142+61
• Nonvalidity of I-Love-Q Relations for Hot White Dwarf Stars
• Time evolution of rotating and magnetized white dwarf stars
• Gravitational waves from SGRs and AXPs as fast-spinning white dwarfs
• High-energy gamma-ray emission from SNR G57.2+0.8 hosting SGR J1935+2154
• Mass limits of the extremely fast-spinning white dwarf CTCV J2056-3014
• Equilibrium Configurations of Rotating White Dwarfs at Finite Temperatures
• Ultra-high energy cosmic rays from white dwarf pulsars and the Hillas criterion
• An updated view and perspectives on high-energy gamma-ray emission from SGR J1935+2154 and its environment
• Data-Driven Constraints on Magnetar Population: No Evidence for a Distinct White Dwarf Channel