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

被引：100

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

共 38 条

[1] SEARCH FOR GRAVITATIONAL WAVE BURSTS FROM SIX MAGNETARS [J].

Abadie, J. ;

Abbott, B. P. ;

Abbott, R. ;

Abernathy, M. ;

Accadia, T. ;

Acernese, F. ;

Adams, C. ;

Adhikari, R. ;

Affeldt, C. ;

Allen, B. ;

Allen, G. S. ;

Ceron, E. Amador ;

Amariutei, D. ;

Amin, R. S. ;

Anderson, S. B. ;

Anderson, W. G. ;

Antonucci, F. ;

Arai, K. ;

Arain, M. A. ;

Araya, M. C. ;

Aston, S. M. ;

Astone, P. ;

Atkinson, D. ;

Aufmuth, P. ;

Aulbert, C. ;

Aylott, B. E. ;

Babak, S. ;

Baker, P. ;

Ballardin, G. ;

Ballmer, S. ;

Barker, D. ;

Barnum, S. ;

Barone, F. ;

Barr, B. ;

Barriga, P. ;

Barsotti, L. ;

Barsuglia, M. ;

Barton, M. A. ;

Bartos, I. ;

Bassiri, R. ;

Bastarrika, M. ;

Basti, A. ;

Bauchrowitz, J. ;

Bauer, Th S. ;

Behnke, B. ;

Beker, M. G. ;

Bell, A. S. ;

Belletoile, A. ;

Belopolski, I. ;

Benacquista, M. .

ASTROPHYSICAL JOURNAL LETTERS, 2011, 734 (02)

[2] Axisymmetric magnetic fields in stars: relative strengths of poloidal and toroidal components [J].

Braithwaite, Jonathan .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2009, 397 (02) :763-774

[3] CONFIDENCE-INTERVALS FROM THE RAYLEIGH TEST [J].

BRAZIER, KTS .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1994, 268 (03) :709-712

[4] Precession and nutation of a gyroscope [J].

Butikov, Eugene .

EUROPEAN JOURNAL OF PHYSICS, 2006, 27 (05) :1071-1081

[5]

CHANMUGAM G, 1992, ANNU REV ASTRON ASTR, V30, P143

[6] Periodicities in rotation and DM of PSR B1557-50 [J].

Chukwude, AE ;

Ubachukwu, AA ;

Okeke, PN .

ASTRONOMY & ASTROPHYSICS, 2003, 399 (01) :231-235

[7]

Cutler C, 2002, PHYS REV D, V66, DOI 10.1103/PhysRevD.66.084025

[8] Early evolution of newly born magnetars with a strong toroidal field [J].

Dall'Osso, S. ;

Shore, S. N. ;

Stella, L. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2009, 398 (04) :1869-1885

[9] Detailed high-energy characteristics of AXP 4U 0142+61 -: Multi-year observations with INTEGRAL, RXTE, XMM-Newton, and ASCA [J].

den Hartog, P. R. ;

Kuiper, L. ;

Hermsen, W. ;

Kaspi, V. M. ;

Dib, R. ;

Knodlseder, J. ;

Gavriil, F. P. .

ASTRONOMY & ASTROPHYSICS, 2008, 489 (01) :245-261

[10] INTEGRAL survey of the Cassiopeia region in hard X rays [J].

den Hartog, PR ;

Hermsen, W ;

Kuiper, L ;

Vink, J ;

't Zand, JJMI ;

Collmar, W .

ASTRONOMY & ASTROPHYSICS, 2006, 451 (02) :587-602

← 1 2 3 4 →