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The Dipole Magnetic Field and Spin-down Evolutions of the High Braking Index Pulsar PSR J1640-4631
Gao, Zhi-Fu1,2; Wang, Na1,2; Shan, Hao1; Li, Xiang-Dong3,4; Wang, Wei5,6
2017-11-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume849Issue:1Pages:12
Corresponding AuthorGao, Zhi-Fu(zhifugao@xao.ac.cn)
AbstractIn this work, we interpreted the high braking index of PSR J1640-4631 with a combination of the magnetodipole radiation and dipole magnetic field decay models. By introducing a mean rotation energy conversion coefficient (zeta) over bar, the ratio of the total high-energy photon energy to the total rotation energy loss in the whole life of the pulsar, and combining the pulsar's high-energy and timing observations with a reliable nuclear equation of state, we estimate the pulsar's initial spin period, P-0 similar to (17-44) ms, corresponding to the moment of inertia I similar to (0.8-2.1) x 10(45) g cm(2). Assuming that PSR J1640-4631 has experienced a long-term exponential decay of the dipole magnetic field, we calculate the true age t(age), the effective magnetic field decay timescale tau(D), and ;the initial surface dipole magnetic field at the pole B-p (0) of the pulsar to be 2900-3100 yr, 1.07(2) x 10(5) yr, and (1.84-4.20) x 10(13) G, respectively. The measured braking index of n = 3.15(3) for PSR J1640-4631 is attributed to its long-term dipole magnetic field decay and a low magnetic field decay rate, dB(p)/dt similar to -(1.66-3.85) x 10(8) G yr(-1). Our model can be applied to both the high braking index (n > 3) and low braking index (n < 3) pulsars, tested by the future polarization, timing, and high-energy observations of PSR J1640-4631.
KeywordISM: supernova remnants magnetic field: neutron pulsars: individual (J1640-4631) stars: evolution
DOI10.3847/1538-4357/aa8f49
WOS KeywordISOLATED NEUTRON-STARS ; GAMMA-RAY REPEATERS ; EQUATION-OF-STATE ; SINGLE RADIO PULSARS ; SUPERNOVA-REMNANTS ; MAGNETOTHERMAL EVOLUTION ; POPULATION SYNTHESIS ; YOUNG PULSAR ; HIGH-ENERGY ; DECAY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000425465900001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22281
Collection中国科学院紫金山天文台
Corresponding AuthorGao, Zhi-Fu
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Nanjing Univ, Dept Astron, Nanjing 210046, Jiangsu, Peoples R China
4.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210046, Jiangsu, Peoples R China
5.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Hubei, Peoples R China
6.Chiese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Gao, Zhi-Fu,Wang, Na,Shan, Hao,et al. The Dipole Magnetic Field and Spin-down Evolutions of the High Braking Index Pulsar PSR J1640-4631[J]. ASTROPHYSICAL JOURNAL,2017,849(1):12.
APA Gao, Zhi-Fu,Wang, Na,Shan, Hao,Li, Xiang-Dong,&Wang, Wei.(2017).The Dipole Magnetic Field and Spin-down Evolutions of the High Braking Index Pulsar PSR J1640-4631.ASTROPHYSICAL JOURNAL,849(1),12.
MLA Gao, Zhi-Fu,et al."The Dipole Magnetic Field and Spin-down Evolutions of the High Braking Index Pulsar PSR J1640-4631".ASTROPHYSICAL JOURNAL 849.1(2017):12.
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