AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS

	AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS
	Yuan Q(袁强); Yuan, Q; Liu, 毕效军; SM; Bi, XJ
刊名	ASTROPHYSICAL JOURNAL
	2012
卷号	761 期号:2 页码:133
关键词	cosmic rays gamma rays: ISM ISM: supernova remnants radiation mechanisms: non-thermal
英文摘要	Shocks of supernova remnants (SNRs) are important (and perhaps the dominant) agents for the production of the Galactic cosmic rays. Recent gamma-ray observations of several SNRs have made this case more compelling. However, these broadband high-energy measurements also reveal a variety of spectral shapes demanding more comprehensive modeling of emissions from SNRs. According to the locally observed fluxes of cosmic-ray protons and electrons, the electron-to-proton number ratio is known to be about 1%. Assuming such a ratio is universal for all SNRs and identical spectral shape for all kinds of accelerated particles, we propose a unified model that ascribes the distinct gamma-ray spectra of different SNRs to variations of the medium density and the spectral difference between cosmic-ray electrons and protons observed from Earth to transport effects. For low-density environments, the gamma-ray emission is inverse-Compton dominated. For high-density environments like systems of high-energy particles interacting with molecular clouds, the gamma-ray emission is pi(0)-decay dominated. The model predicts a hadronic origin of gamma-ray emission from very old remnants interacting mostly with molecular clouds and a leptonic origin for intermediate-age remnants whose shocks propagate in a low-density environment created by their progenitors via, e. g., strong stellar winds. These results can be regarded as evidence in support of the SNR origin of Galactic cosmic rays.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000312090300052
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224428]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Yuan Q,Yuan, Q,Liu, 毕效军,et al. AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS[J]. ASTROPHYSICAL JOURNAL,2012,761(2):133.
APA	袁强,Yuan, Q,Liu, 毕效军,SM,&Bi, XJ.(2012).AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS.ASTROPHYSICAL JOURNAL,761(2),133.
MLA	袁强,et al."AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS".ASTROPHYSICAL JOURNAL 761.2(2012):133.