On the hadronic gamma-ray emission from Tycho's supernova remnant

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	On the hadronic gamma-ray emission from Tycho's supernova remnant
	Zhang, Xiao 1; Chen, Yang 1,2; Li, Hui1,4 ; Zhou, Xin2,3,5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2013-02-01
卷号	429 期号:1 页码:L25-L29
关键词	radiation mechanisms: non-thermal ISM: individual objects: Tycho ISM: supernova remnants gamma-rays: ISM
ISSN号	0035-8711
通讯作者	Zhang, X (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China. Email: ygchen@nju.edu.cn
英文摘要	Hadronic gamma-ray emission from supernova remnants (SNRs) is an important tool to test shock acceleration of cosmic-ray protons. Tycho is one of nearly a dozen Galactic SNRs which are suggested to emit hadronic gamma-ray emission. Among them, however, it is the only one in which the hadronic emission is proposed to arise from the interaction with a low-density (similar to 0.3 cm(-3)) ambient medium. Here we present an alternative hadronic explanation with a modest energy conversion efficiency (of the order of 1 per cent) for this young remnant. With such an efficiency, a normal electron-to-proton ratio (of the order of 10(-2)) is derived from the radio and X-ray synchrotron spectra, and an average ambient density that is at least one order of magnitude higher is derived from the hadronic gamma-ray flux. This result is consistent with the multiband evidence of the presence of a dense medium from the north to the east of the Tycho SNR. The SNR-cloud association, in combination with the H I absorption data, helps to constrain the so-far controversial distance to Tycho and leads to an estimate of 2.5 kpc.
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]	DIFFUSIVE SHOCK ACCELERATION ; MOLECULAR CLOUDS ; INTERSTELLAR-MEDIUM ; RX J1713.7-3946 ; MAGNETIC-FIELD ; COSMIC-RAYS ; SN 1572 ; IA ; CASSIOPEIA ; DISCOVERY
收录类别	SCI
语种	英语
WOS记录号	WOS:000318238300006
公开日期	2014-01-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/9856]
专题	紫金山天文台_太阳高能及相关物理过程研究团组
作者单位	1.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China 2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 3.Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 4.Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA 5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xiao,Chen, Yang,Li, Hui,et al. On the hadronic gamma-ray emission from Tycho's supernova remnant[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,429(1):L25-L29.
APA	Zhang, Xiao,Chen, Yang,Li, Hui,&Zhou, Xin.(2013).On the hadronic gamma-ray emission from Tycho's supernova remnant.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,429(1),L25-L29.
MLA	Zhang, Xiao,et al."On the hadronic gamma-ray emission from Tycho's supernova remnant".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 429.1(2013):L25-L29.