A NEW METHOD TO STUDY THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND AND THE FIRST APPLICATION ON AT20G

	A NEW METHOD TO STUDY THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND AND THE FIRST APPLICATION ON AT20G
	Zhou M(周明)1,2,3 ; Wang JC(王建成)1,2 ; Gao XY(高小燕)1,2,3
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2011-02-01
卷号	727 期号:2
关键词	gamma rays: diffuse background methods: statistical quasars: general
ISSN号	2041-8205
通讯作者	Zhou, M (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	In this Letter, we introduce a new method of image stacking to directly study the undetected but possible gamma-ray point sources. Applying the method to the Australia Telescope 20 GHz Survey sources which have not been detected by Large Area Telescope on the Fermi Gamma-ray Space Telescope, we find that the sources contribute (10.5 +/- 1.1)% and (4.3 +/- 0.9)% of the extragalactic gamma-ray background (EGB) and have a very soft spectrum with the photon indices of 3.09 +/- 0.23 and 2.61 +/- 0.26 in the 1-3 GeV and 3-300 GeV energy ranges, respectively. In the 0.1-1 GeV range, they probably contribute a larger fraction to the EGB, but it is not quite certain. It may not be appropriate to assume that the undetected sources have similar properties to the detected sources.
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]	LARGE-AREA TELESCOPE ; ACTIVE GALACTIC NUCLEI ; SPACE-TELESCOPE ; SOURCE CATALOG ; BLAZARS ; EGRB
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/2041-8205/727/2/L46/meta
语种	英语
WOS记录号	WOS:000286196200019
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5014]
专题	云南天文台_高能天体物理研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 3.Graduate School, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Zhou M,Wang JC,Gao XY. A NEW METHOD TO STUDY THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND AND THE FIRST APPLICATION ON AT20G[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,727(2).
APA	Zhou M,Wang JC,&Gao XY.(2011).A NEW METHOD TO STUDY THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND AND THE FIRST APPLICATION ON AT20G.ASTROPHYSICAL JOURNAL LETTERS,727(2).
MLA	Zhou M,et al."A NEW METHOD TO STUDY THE ORIGIN OF THE EXTRAGALACTIC GAMMA-RAY BACKGROUND AND THE FIRST APPLICATION ON AT20G".ASTROPHYSICAL JOURNAL LETTERS 727.2(2011).