LONG-TERM MONITORING OF MODE SWITCHING FOR PSR B0329+54

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	LONG-TERM MONITORING OF MODE SWITCHING FOR PSR B0329+54
	Chen, J. L.1,2 ; Wang, H. G.3,4; Wang, N.1 ; Lyne, A.5; Liu, Z. Y.1 ; Jessner, A.4; Yuan, J. P.1 ; Kramer, M.4
刊名	ASTROPHYSICAL JOURNAL
	2011-11-01
卷号	741 期号:1 页码:文献号48
关键词	methods: observational pulsars: individual (PSR B0329+54)
ISSN号	0004-637X
通讯作者	hgwang@gzhu.edu.cn
英文摘要	The mode-switching phenomenon of PSR B0329+54 is investigated based on the long-term monitoring from 2003 September to 2009 April made with the Urumqi 25 m radio telescope at 1540 MHz. At that frequency, the change of relative intensity between the leading and trailing components is the predominant feature of mode switching. The intensity ratios between the leading and trailing components are measured for the individual profiles averaged over a few minutes. It is found that the ratios follow normal distributions, where the abnormal mode has a greater typical width than the normal mode, indicating that the abnormal mode is less stable than the normal mode. Our data show that 84.9% of the time for PSR B0329+54 was in the normal mode and 15.1% was in the abnormal mode. From the two passages of eight-day quasi-continuous observations in 2004, supplemented by the daily data observed with the 15 m telescope at 610MHz at Jodrell Bank Observatory, the intrinsic distributions of mode timescales are constrained with the Bayesian inference method. It is found that the gamma distribution with the shape parameter slightly smaller than 1 is favored over the normal, log-normal, and Pareto distributions. The optimal scale parameters of the gamma distribution are 31.5minutes for the abnormal mode and 154 minutes for the normal mode. The shape parameters have very similar values, i.e., 0.75(-0.17)(+0.22) for the normal mode and 0.84(-0.22)(+0.28) for the abnormal mode, indicating that the physical mechanisms in both modes may be the same. No long-term modulation of the relative intensity ratios was found for either mode, suggesting that the mode switching was stable. The intrinsic timescale distributions, constrained for this pulsar for the first time, provide valuable information to understand the physics of mode switching.
学科主题	致密天体、高能和基础物理
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	EMPIRICAL-THEORY ; PULSAR EMISSION ; RADIO-EMISSION ; PROFILES ; BEHAVIOR ; GEOMETRY ; MHZ
收录类别	SCI
资助信息	the Knowledge Innovation Program of the Chinese Academy of Sciences,Grant No.KJCX2-YW-T09;NSFC project 10673021,10778714;National Basic Research Program of China (973 Program 2009CB824800);the Bureau of Education of Guangzhou Municipality (No. 11 Sui-Jiao-Ke (2009));GDUPS (2009)
语种	英语
WOS记录号	WOS:000296769000048
公开日期	2013-03-06
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/80]
专题	脉冲星研究团组新疆天文台_射电天文研究室新疆天文台_其它
作者单位	1.Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China 4.Max Planck Inst Radio Astron, D-53121 Bonn, Germany 5.Univ Manchester, Jodrell Bank, Manchester M13 9PL, Lancs, England
推荐引用方式 GB/T 7714	Chen, J. L.,Wang, H. G.,Wang, N.,et al. LONG-TERM MONITORING OF MODE SWITCHING FOR PSR B0329+54[J]. ASTROPHYSICAL JOURNAL,2011,741(1):文献号48.
APA	Chen, J. L..,Wang, H. G..,Wang, N..,Lyne, A..,Liu, Z. Y..,...&Kramer, M..(2011).LONG-TERM MONITORING OF MODE SWITCHING FOR PSR B0329+54.ASTROPHYSICAL JOURNAL,741(1),文献号48.
MLA	Chen, J. L.,et al."LONG-TERM MONITORING OF MODE SWITCHING FOR PSR B0329+54".ASTROPHYSICAL JOURNAL 741.1(2011):文献号48.