Possible evidence for free precession of a strongly magnetized neutron star in the magnetar 4U 0142+61.
Kazuo Makishima,Teruaki Enoto,J. Hiraga,Toshio Nakano,Koji Nakazawa,Soki Sakurai,Masaki Sasano,Hiroshi Murakami +7 more
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The magnetar 4 U 0142+61, one of the prototypes of this class, was studied in broadband x rays with the Suzaku observatory and suggests a strong toroidal magnetic field, ∼ 10(12) T, residing inside the object.Abstract:
broadband x rays (0.5–70 keV) with the Suzaku observatory. In hard x rays (15–40 keV), its 8.69 sec pulsations suffered slow phase modulations by � 0.7 sec, with a period of ∼15 h. When this effect is interpreted as free precession of the neutron star, the object is inferred to deviate from spherical symmetry by ∼1.6 × 10 −4 in its moments of inertia. This deformation, when ascribed to magnetic pressure, suggests a strong toroidal magnetic field, ∼10 12 T, residing inside the object. This provides one of the first observational approaches towards toroidal magnetic fields of magnetars.read more
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