Possible Evidence for Free Precession of a Strongly Magnetized Neutron Star in the Magnetar 4U 0142+61

被引：92

作者：

Makishima, K. ^{[1
,2
,3
]}

Enoto, T. ^{[4
,5
]}

Hiraga, J. S. ^{[2
]}

Nakano, T. ^{[1
]}

Nakazawa, K. ^{[1
]}

Sakurai, S. ^{[1
]}

Sasano, M. ^{[1
]}

Murakami, H. ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[2] Univ Tokyo, Grad Sch Sci, Res Ctr Early Univ, Bunkyo Ku, Tokyo 1130033, Japan

[3] RIKEN, MAXI Team, Wako, Saitama 3510198, Japan

[4] RIKEN, Nishina Ctr, High Energy Astrophys Lab, Wako, Saitama 3510198, Japan

[5] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 17期

关键词：

X-RAY PULSARS; BOARD SUZAKU; FIELDS; SOFT; 4U-0142+61; EVOLUTION; REPEATERS; RXTE;

D O I：

10.1103/PhysRevLett.112.171102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetars are a special type of neutron stars, considered to have extreme dipole magnetic fields reaching similar to 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 similar to 15 h. When this effect is interpreted as free precession of the neutron star, the object is inferred to deviate from spherical symmetry by similar to 1.6 x 10(-4) in its moments of inertia. This deformation, when ascribed to magnetic pressure, suggests a strong toroidal magnetic field, similar to 10(12) T, residing inside the object. This provides one of the first observational approaches towards toroidal magnetic fields of magnetars.

引用

页数：5

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