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TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS
Huang, Lei1; Yu C(余聪)2,3; Tong, Hao4; Huang, L (reprint author), Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2016-08-10
卷号827期号:1
DOI10.3847/0004-637X/827/1/80
产权排序第2完成单位
收录类别SCI
关键词Instabilities Pulsars: General Stars: Magnetars Stars: Magnetic Field Stars: Neutron
摘要We propose that the magnetosphere reconfiguration induced by magnetic twists in the closed field line region can account for the mode. switching of intermittent pulsars. We carefully investigate the properties of axisymmetric force-free pulsar magnetospheres with magnetic twists in closed field line regions around the polar caps. The magnetosphere with twisted closed lines leads to enhanced spin-down rates. The enhancement in spin-down rate depends on the size of the. region with twisted closed lines. Typically, it is increased by a factor of similar to 2, which is consistent with the intermittent pulsars' spin-down behavior during the "off" and "on" states. We find that. there is a threshold of maximal twist angle Delta phi(thres) similar to 1. The magnetosphere is stable only if the closed line twist angle is less than Delta phi(thres). Beyond this value, the magnetosphere becomes unstable and gets untwisted. The spin-down rate would reduce to its off-state value. The quasi-periodicity in spin-down rate change can be explained by long-term activities in the star's crust and the untwisting induced by MHD instability. The estimated duration of on-state is about 1. week, consistent with observations. Due to the MHD instability, there exists an upper limit for the spin-down ratio (f similar to 3) between the on-state and the off-state, if the Y-point remains at the light cylinder.
项目资助者National Natural Science Foundation of China(11203055, 11173046, 11373064, 11521303) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Yunnan Natural Science Foundation(2012FB187, 2014HB048) ; Youth Innovation Promotion Association, Chinese Academy of Sciences
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000382009500080
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MAGNETAR GIANT FLARES ; FLUX ROPE ERUPTIONS ; X-RAY PULSARS ; SPIN-DOWN ; CURRENT SHEETS ; NEUTRON-STARS ; RADIO ; FIELD ; B0540-69 ; BEHAVIOR
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9691
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Huang, L (reprint author), Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China.
作者单位1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China
3.Key Laboratory for the Structure and Evolution of Celestial Object, Chinese Academy of Sciences, Kunming, 650011, China
4.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China
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Huang, Lei,Yu C,Tong, Hao,et al. TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS[J]. ASTROPHYSICAL JOURNAL,2016,827(1).
APA Huang, Lei,Yu C,Tong, Hao,&Huang, L .(2016).TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS.ASTROPHYSICAL JOURNAL,827(1).
MLA Huang, Lei,et al."TWIST-INDUCED MAGNETOSPHERE RECONFIGURATION FOR INTERMITTENT PULSARS".ASTROPHYSICAL JOURNAL 827.1(2016).
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