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Long-term evolutions of the cyclotron line energies in her x-1, vela x-1, and cen x-3 as observed with swift/bat

文献类型:期刊论文

作者Ji, L.1; Staubert, R.1; Ducci, L.1; Santangelo, A.1; Zhang, S.2; Chang, Z.2
刊名Monthly notices of the royal astronomical society
出版日期2019-04-01
卷号484期号:3页码:3797-3805
ISSN号0035-8711
关键词Radiation mechanisms: thermal Scattering Stars: magnetic field Stars: neutron X-rays: binaries X-rays: individual: her x-1, vela x-1, cen x-3
DOI10.1093/mnras/stz264
通讯作者Ji, l.(ji.long@astro.uni-tuebingen.de)
英文摘要We study the long-term evolution of the centroid energy of cyclotron lines - often referered to as cyclotron resonance scattering features (crsfs) - in her x-1, vela x-1, and cen x-3, using survey observations of the burst alert telescope onboard swift. we find a significant decrease of the fundamental crsf energy in her x-1 and the first harmonic line energy in vela x-1 since the launch of swift in 2004 and until 2010 and 2012, respectively. in both sources, the decreases stopped at some time, with a quite stable centroid energy thereafter. unlike in her x-1 and vela x-1, the crsf energy in cen x-3 does not show a long-term decrease. it is observed not to change for at least the past 14 yr. the long-term variation of the line energy is a direct way to investigate the magnetic field structure in the polar regions of pulsars. our results may stimulate the development of theoretical models, especially regarding how the accreted mass accumulates in the accretion mound or how the magnetic field distorts around the polar cap.
WOS关键词MAGNETIC-FIELD ; LUMINOSITY ; DECAY ; BAT
资助项目Chinese NSFC[11473027] ; Chinese NSFC[11733009] ; XTP project[XDA 04060604] ; Strategic Priority Research Programme 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences[XDB09000000] ; National Key Research and Development Program of China[2016YFA0400800]
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000462410300070
资助机构Chinese NSFC ; XTP project ; Strategic Priority Research Programme 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences ; National Key Research and Development Program of China
URI标识http://www.irgrid.ac.cn/handle/1471x/2160744
专题高能物理研究所
通讯作者Ji, L.
作者单位1.Kepler Ctr Astro & Particle Phys, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany
2.Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
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Ji, L.,Staubert, R.,Ducci, L.,et al. Long-term evolutions of the cyclotron line energies in her x-1, vela x-1, and cen x-3 as observed with swift/bat[J]. Monthly notices of the royal astronomical society,2019,484(3):3797-3805.
APA Ji, L.,Staubert, R.,Ducci, L.,Santangelo, A.,Zhang, S.,&Chang, Z..(2019).Long-term evolutions of the cyclotron line energies in her x-1, vela x-1, and cen x-3 as observed with swift/bat.Monthly notices of the royal astronomical society,484(3),3797-3805.
MLA Ji, L.,et al."Long-term evolutions of the cyclotron line energies in her x-1, vela x-1, and cen x-3 as observed with swift/bat".Monthly notices of the royal astronomical society 484.3(2019):3797-3805.

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