Constraining the braking indices of magnetars

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 宇宙伽马暴、中子星及相关物理研究团组

	Constraining the braking indices of magnetars
	Gao, Z. F.1,2; Li, X-D.3,4; Wang, N.1; Yuan, J. P.1; Wang, P.5; Peng, Q. H.3,4; Du, Y. J.6
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2016-02-11
卷号	456 期号:1 页码:55-65
关键词	stars: magnetars stars: magnetic field stars: rotation stars: winds, outflows ISM: supernova remnants
英文摘要	Because of the lack of long-term pulsed emission in quiescence and the strong timing noise, it is impossible to directly measure the braking index n of a magnetar. Based on the estimated ages of their potentially associated supernova remnants (SNRs), we estimate the values of the mean braking indices of eight magnetars with SNRs, and find that they cluster in the range of 1-42. Five magnetars have smaller mean braking indices of 1 < n < 3, and we interpret them within a combination of magneto-dipole radiation and wind-aided braking. The larger mean braking indices of n > 3 for the other three magnetars are attributed to the decay of external braking torque, which might be caused by magnetic field decay. We estimate the possible wind luminosities for the magnetars with 1 < n < 3, and the dipolar magnetic field decay rates for the magnetars with n > 3, within the updated magneto-thermal evolution models. Although the constrained range of the magnetars' braking indices is tentative, as a result of the uncertainties in the SNR ages due to distance uncertainties and the unknown conditions of the expanding shells, our method provides an effective way to constrain the magnetars' braking indices if the measurements of the SNR ages are reliable, which can be improved by future observations.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	X-RAY PULSARS ; MAGNETIZED NEUTRON-STARS ; XMM-NEWTON OBSERVATIONS ; LARGE-MAGELLANIC-CLOUD ; REPEATER SGR 1627-41 ; SUPERNOVA REMNANT ; SPIN-DOWN ; MAGNETOTHERMAL EVOLUTION ; TIMING IRREGULARITIES ; CXOU J171405.7-381031
收录类别	SCI
语种	英语
WOS记录号	WOS:000368010000032
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/16108]
专题	紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组
作者单位	1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, 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.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China
推荐引用方式 GB/T 7714	Gao, Z. F.,Li, X-D.,Wang, N.,et al. Constraining the braking indices of magnetars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,456(1):55-65.
APA	Gao, Z. F..,Li, X-D..,Wang, N..,Yuan, J. P..,Wang, P..,...&Du, Y. J..(2016).Constraining the braking indices of magnetars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,456(1),55-65.
MLA	Gao, Z. F.,et al."Constraining the braking indices of magnetars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 456.1(2016):55-65.