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Title: ON THE MAGNETIC FIELD OF PULSARS WITH REALISTIC NEUTRON STAR CONFIGURATIONS

We have recently developed a neutron star model fulfilling global and not local charge neutrality, both in the static and in the uniformly rotating cases. The model is described by the coupled Einstein-Maxwell-Thomas-Fermi equations, in which all fundamental interactions are accounted for in the framework of general relativity and relativistic mean field theory. Uniform rotation is introduced following Hartle's formalism. We show that the use of realistic parameters of rotating neutron stars, obtained from numerical integration of the self-consistent axisymmetric general relativistic equations of equilibrium, leads to values of the magnetic field and radiation efficiency of pulsars that are very different from estimates based on fiducial parameters that assume a neutron star mass M = 1.4 M {sub ☉}, radius R = 10 km, and moment of inertia I = 10{sup 45} g cm{sup 2}. In addition, we compare and contrast the magnetic field inferred from the traditional Newtonian rotating magnetic dipole model with respect to the one obtained from its general relativistic analog, which takes into account the effect of the finite size of the source. We apply these considerations to the specific high-magnetic field pulsar class and show that, indeed, all of these sources can be described as canonical pulsars drivenmore » by the rotational energy of the neutron star, and have magnetic fields lower than the quantum critical field for any value of the neutron star mass.« less
Authors:
; ;  [1]
  1. Dipartimento di Fisica and ICRA, Sapienza Universita' di Roma P.le Aldo Moro 5, I-00185 Rome (Italy)
Publication Date:
OSTI Identifier:
22364540
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 799; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AXIAL SYMMETRY; COMPARATIVE EVALUATIONS; CRITICAL FIELD; EINSTEIN-MAXWELL EQUATIONS; EQUATIONS OF STATE; EQUILIBRIUM; GENERAL RELATIVITY THEORY; GRAVITATION; MAGNETIC DIPOLES; MASS; MEAN-FIELD THEORY; MOMENT OF INERTIA; NEUTRON STARS; NEUTRONS; PULSARS; RELATIVISTIC RANGE; ROTATION; THOMAS-FERMI MODEL