Explanation of the Knee-like Feature in the DAMPE Cosmic e(-) + e(+) Energy Spectrum

doi:10.3847/1538-4357/aaa710

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	Explanation of the Knee-like Feature in the DAMPE Cosmic e(-) + e(+) Energy Spectrum
	Yin, PF; Fang K(方堃); Bi XJ(毕效军); Yin PF(殷鹏飞); Fang, K; Bi, XJ
刊名	ASTROPHYSICAL JOURNAL
	2018
卷号	854 期号:1 页码:57
关键词	cosmic rays ISM: supernova remnants pulsars: general
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaa710
文献子类	Article
英文摘要	The DArk Matter Particle Explorer, a space-based high precision cosmic-ray detector, has just reported the new measurement of the total electron plus positron energy spectrum up to 4.6 TeV. A notable feature in the spectrum is the spectral break at similar to 0.9 TeV, with the spectral index softening from -3.1 to -3.9. Such a feature is very similar to the knee at the cosmic nuclei energy spectrum. In this work, we propose that the knee-like feature can be explained naturally by assuming that the electrons are accelerated at the supernova remnants (SNRs) and released when the SNRs die out with lifetimes around 105 years. The cut-off energy of those electrons have already decreased to several TeV due to radiative cooling, which may induce the observed TeV spectral break. Another possibility is that the break is induced by a single nearby old SNR. Such a scenario may bring a large electron flux anisotropy that may be observable by the future detectors. We also show that a minor part of electrons escaping during the acceleration in young and nearby SNRs is able to contribute to a several TeV or higher energy region of the spectrum.
电子版国际标准刊号	1538-4357
WOS关键词	PULSAR-WIND NEBULAE ; SUPERNOVA-REMNANTS ; RAY ELECTRONS ; PARTICLE ACCELERATION ; ENERGY-SPECTRUM ; MAGNETIC-FIELD ; POSITRON FLUX ; SHOCK FRONTS ; CATALOG ; EVOLUTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000424897400007
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285627]
专题	高能物理研究所_粒子天体物理中心
通讯作者	Fang K(方堃)
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Yin, PF,Fang K,Bi XJ,et al. Explanation of the Knee-like Feature in the DAMPE Cosmic e(-) + e(+) Energy Spectrum[J]. ASTROPHYSICAL JOURNAL,2018,854(1):57.
APA	Yin, PF,方堃,毕效军,殷鹏飞,Fang, K,&Bi, XJ.(2018).Explanation of the Knee-like Feature in the DAMPE Cosmic e(-) + e(+) Energy Spectrum.ASTROPHYSICAL JOURNAL,854(1),57.
MLA	Yin, PF,et al."Explanation of the Knee-like Feature in the DAMPE Cosmic e(-) + e(+) Energy Spectrum".ASTROPHYSICAL JOURNAL 854.1(2018):57.