Full electromagnetic cascades in spin-powered pulsars

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	Full electromagnetic cascades in spin-powered pulsars
	Fang, J 1; Zhang L(张力)1,2
刊名	ASTROPHYSICAL JOURNAL
	2006-12-10
卷号	653 期号:1 页码:573-579
关键词	pulsars : general radiation mechanisms : nonthermal
ISSN号	0004-637X
通讯作者	Fang, J (reprint author), Yunnan Univ, Dept Phys, Kunming 650031, Peoples R China.
产权排序	第二完成单位
英文摘要	We simulate the full pair-photon cascade initiated by a single primary electron above the stellar surface of a normal spin-down-powered pulsar, using the Monte Carlo method. For a primary electron with a specified initial energy moving along a given field line, a cascade is initiated at the lower pair formation front. This cascade involves curvature radiation from the primary electron, conversion of photons emitted by the primary and secondary particles to electron-positron pairs, and subsequent quantum synchrotron radiation and inverse Compton scattering by the secondary pairs. Finally, high-energy photon and pair spectra are calculated. In our simulation, the space charge limited flow model is incorporated, in which the acceleration gap is high above the stellar surface (about several stellar radii). However, we do not consider the exact acceleration in the gap; we just give the initial energy of the electron at the pair formation front and then trace the primary and secondary particles and photons emitted during the journey of those particles in the magnetosphere. Based on a two-dimensional picture and ignoring rotational effects, we calculate the resulting spectra for different pulsar parameters and find that the inverse Compton scattering component of the pairs can contribute significantly to the final spectrum below several MeV for a normal pulsar.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY PULSARS ; STRONG MAGNETIC-FIELDS ; POLAR-CAP MODELS ; ENERGETIC RADIATION ; CURVATURE-RADIATION ; PAIR FORMATION ; OUTER GAPS ; EMISSION ; SPECTRA ; ELECTRODYNAMICS
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/653/1/573/
语种	英语
WOS记录号	WOS:000242913800047
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4193]
专题	云南天文台_其他
作者单位	1.Department of Physics, Yunnan University, 650031 Kunming, China 2.Yunnan Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
推荐引用方式 GB/T 7714	Fang, J,Zhang L. Full electromagnetic cascades in spin-powered pulsars[J]. ASTROPHYSICAL JOURNAL,2006,653(1):573-579.
APA	Fang, J,&Zhang L.(2006).Full electromagnetic cascades in spin-powered pulsars.ASTROPHYSICAL JOURNAL,653(1),573-579.
MLA	Fang, J,et al."Full electromagnetic cascades in spin-powered pulsars".ASTROPHYSICAL JOURNAL 653.1(2006):573-579.