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2022-12-19T03:41:39Z
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Possible Evidence for Free Precession of a Strongly Magnetized Neutron Star in the Magnetar 4U 0142+61
Makishima, K.
2204
Enoto, T.
2205
Hiraga, J. S.
2206
Nakano, T.
2207
Nakazawa, K.
2208
Sakurai, S.
2209
Sasano, M.
2210
Murakami, H
2211
Magnetars are a special type of neutron stars, considered to have extreme dipole magnetic fields reaching ∼10^11 T. The magnetar 4U 0142+61, one of the prototypes of this class, was studied in 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.
UTokyo Research掲載「宇宙で最強な磁石天体が、磁力でわずかに変形している兆候を発見」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/the-strongest-magnetic-stars-are-possibly-deformed/
UTokyo Research "The strongest magnetic stars are possibly deformed" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/the-strongest-magnetic-stars-are-possibly-deformed/
journal article
American Physical Society
2014-04-30
application/pdf
Physical Review Letters
17
112
171102
AA00773679
0031-9007
1079-7114
https://repository.dl.itc.u-tokyo.ac.jp/record/662/files/PhysRevLett.112.171102.pdf
eng
info:doi/10.1103/Phys RevLett.112.171 102
http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/the-strongest-magnetic-stars-are-possibly-deformed/
http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/the-strongest-magnetic-stars-are-possibly-deformed/
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.171102
(c) 2014 American Physical Society