Landau level-superfluid modified factor and effective X/$\gamma$-ray coefficient of a magnetar

Abstract

As soon as the energy of electrons near the Fermi surface are higher than $Q$, the threshold energy of inverse $\beta -$ decay, the electron capture process will dominate. The resulting high-energy neutrons will destroy anisotropic ${}^3{P}_2$ neutron superfluid Cooper pairs. By colliding with the neutrons produced in the process $n+(n\uparrow n\downarrow )⟶n+n+n$, the kinetic energy of the outgoing neutrons will be transformed into thermal energy. The transformed thermal energy would transported from the star interior to the star surface by conduction, then would be transformed into radiation energy as soft X-rays and gamma-rays. After a highly efficient modulation within the pulsar magnetosphere, the surface thermal emission (mainly soft X/$\gamma$-ray emission) has been shaped into a spectrum with the observed characteristics of magnetars. By introducing two important parameters: Landau level-superfluid modified factor and effective X/$\gamma$-ray coefficient, we numerically simulate the process of magnetar cooling and magnetic field decay, and then compute magnetars' soft X/$\gamma$-ray luminosities $L_X$. Further, we obtain aschematic diagrams of $L_X$ as a function of magnetic field strength $B$. The observations are compared with the calculations.

13 Pages, 2 Figures, Published in Astrophys. Space. Sci. 2011. 336, P.427-439

References in corpus (11)

• Corona of Magnetars
• Supernova remnant energetics and magnetars: no evidence in favour of millisecond proto-neutron stars
• X-ray spectra from magnetar candidates. I. Monte Carlo simulations in the non-relativistic regime
• The first XMM-Newton observations of the Soft Gamma-ray Repeater SGR 1900+14
• From outburst to quiescence: the decay of the transient Anomalous X-ray Pulsar XTE J1810-197
• The physics of strong magnetic fields in neutron stars
• XMM-Newton observation of the Soft Gamma Ray Repeater SGR 1627-41 in a low luminosity state
• On the X-Ray Light Curve, Pulsed-Radio Emission, and Spin Frequency Evolution of the Transient Anomalous X-Ray Pulsar Xte J1810--197 During its X-Ray Outburst
• Soft Gamma Repeaters and Anomalous X-ray Pulsars: Magnetar Candidates
• Numerical simulation of the electron capture process in a magnetar interior
• Evolution of superhigh magnetic fields of magnetars

Cited by in corpus (9)

• Pressure of Degenerate and Relativistic electrons in a superhigh magnetic field
• Numerically Fitting The Electron Fermi Energy and The Electron Fraction in A Neutron Star
• Electron capture of iron group nuclei in magnetars
• Magnetic field decay of magnetars in supernova remnants
• A new insight into neutrino energy loss by electron capture of iron group nuclei in magnetars surface
• A unified model of supernova driven by magnetic monopoles
• Singlet pairing gaps of neutrons and protons in hyperonic neutron stars
• Strong screening effects on resonant nuclear reaction ${}^{23}$Mg $(p,\gamma )$ ${}^{24}$Al in the surface of magnetars
• Electron capture strength on odd-A nucleus ${}^{59}$Co in explosive astrophysical environment