MULTI-FREQUENCY RADIO PROFILES OF PSR B1133+16: RADIATION LOCATION AND PARTICLE ENERGY

	MULTI-FREQUENCY RADIO PROFILES OF PSR B1133+16: RADIATION LOCATION AND PARTICLE ENERGY
	Lu, J. G.1,2; Du, Y. J.3; Hao, L. F.4; Yan, Z.5 ; Liu, Z. Y.6; Lee, K. J.7; Qiao, G. J.2; Shang, L. H.8,9; Wang, M.4; Xu, R. X.1,2,7
刊名	ASTROPHYSICAL JOURNAL
	2016-01-10
卷号	816 期号:2
关键词	acceleration of particles pulsars: general pulsars: individual (PSR B1133+16) radiation mechanisms: non-thermal
英文摘要	The pulse profile of PSR B1133+16 is usually regarded as a conal double structure. However, its multi-frequency profiles cannot simply be fitted with two Gaussian functions, and a third component is always needed to fit the bridge region (between two peaks). This would introduce additional, redundant parameters. In this paper, through a comparison of five fitting functions (Gaussian, von Mises, hyperbolic secant, square hyperbolic secant, and Lorentz), it is found that the square hyperbolic secant function can best reproduce the profile, yielding an improved fit. Moreover, a symmetric 2D radiation beam function, instead of a simple 1D Gaussian function, is used to fit the profile. Each profile with either well-resolved or not-so-well-resolved peaks could be fitted adequately using this beam function, and the bridge emission between the two peaks does not need to be a new component. Adopting inclination and impact angles based on polarization measurements, the opening angle (theta(mu)0) of the radiation beam in a certain frequency band is derived from beam-function fitting. The corresponding radiation altitudes are then calculated. Based on multi-frequency profiles, we also computed the Lorentz factors of the particles and their dispersion at those locations in both the curvature-radiation and inverse-Compton-scattering models. We found that the Lorentz factors of the particles decrease rapidly as the radiation altitude increases. Besides, the radiation prefers to be generated in an annular region rather than the core region, and this needs further validation.
收录类别	SCI
语种	英语
WOS记录号	WOS:000368238500028
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5468]
专题	国家天文台_射电天文研究部
作者单位	1.Peking Univ, State Key Lab Nucl Sci & Technol, Beijing 100871, Peoples R China 2.Peking Univ, Sch Phys, Beijing 100871, Peoples R China 3.Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China 4.Chinese Acad Sci, Yunnan Astron Observ, Kunming 650011, Peoples R China 5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 6.Chinese Acad Sci, Xinjjang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 7.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 8.Guizhou Normal Univ, Sch Phys & Elect Sci, Guiyang 550001, Guizhou, Peoples R China 9.NAOC GZNU Ctr Astron Res & Educ, Guiyang 550001, Guizhou, Peoples R China 10.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Lu, J. G.,Du, Y. J.,Hao, L. F.,et al. MULTI-FREQUENCY RADIO PROFILES OF PSR B1133+16: RADIATION LOCATION AND PARTICLE ENERGY[J]. ASTROPHYSICAL JOURNAL,2016,816(2).
APA	Lu, J. G..,Du, Y. J..,Hao, L. F..,Yan, Z..,Liu, Z. Y..,...&Zhi, Q. J..(2016).MULTI-FREQUENCY RADIO PROFILES OF PSR B1133+16: RADIATION LOCATION AND PARTICLE ENERGY.ASTROPHYSICAL JOURNAL,816(2).
MLA	Lu, J. G.,et al."MULTI-FREQUENCY RADIO PROFILES OF PSR B1133+16: RADIATION LOCATION AND PARTICLE ENERGY".ASTROPHYSICAL JOURNAL 816.2(2016).