CORRELATION ANALYSIS BETWEEN TIBET AS-gamma TeV COSMIC RAY AND WMAP NINE-YEAR DATA

	CORRELATION ANALYSIS BETWEEN TIBET AS-gamma TeV COSMIC RAY AND WMAP NINE-YEAR DATA
	Yin, Qian-Qing 1,2; Zhang, Shuang-Nan 1,3
刊名	ASTROPHYSICAL JOURNAL
	2015-08-01
卷号	808 期号:2
关键词	cosmic background radiation cosmic rays
英文摘要	The WMAP team subtracted template-based foreground models to produce foreground-reduced maps, and masked point sources and uncertain sky regions directly; however, whether foreground residuals exist in the WMAP foreground-reduced maps is still an open question. Here, we use Pearson correlation coefficient analysis with AS-gamma TeV cosmic ray (CR) data to probe possible foreground residuals in the WMAP nine-year data. The correlation results between the CR and foreground-contained maps (WMAP foreground-unreduced maps, WMAP template-based, and Maximum Entropy Method foreground models) suggest that: (1) CRs can trace foregrounds in the WMAP data; (2) at least some TeV CRs originate from the Milky Way; (3) foregrounds may be related to the existence of CR anisotropy (loss-cone and tail-in structures); (4) there exist differences among different types of foregrounds in the decl. range of <15 degrees. Then, we generate 10,000 mock cosmic microwave background (CMB) sky maps to describe the cosmic variance, which is used to measure the effect of the fluctuations of all possible CMB maps to the correlations between CR and CMB maps. Finally, we do correlation analysis between the CR and WMAP foreground-reduced maps, and find that: (1) there are significant anticorrelations; and (2) the WMAP foreground-reduced maps are credible. However, the significant anticorrelations may be accidental, and the higher signal-to-noise ratio Planck SMICA map cannot reject the hypothesis of accidental correlations. We therefore can only conclude that the foreground residuals exist with similar to 95% probability.
收录类别	SCI
语种	英语
WOS记录号	WOS:000371002400089
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5445]
专题	国家天文台_空间科学研究部
作者单位	1.Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Yin, Qian-Qing,Zhang, Shuang-Nan. CORRELATION ANALYSIS BETWEEN TIBET AS-gamma TeV COSMIC RAY AND WMAP NINE-YEAR DATA[J]. ASTROPHYSICAL JOURNAL,2015,808(2).
APA	Yin, Qian-Qing,&Zhang, Shuang-Nan.(2015).CORRELATION ANALYSIS BETWEEN TIBET AS-gamma TeV COSMIC RAY AND WMAP NINE-YEAR DATA.ASTROPHYSICAL JOURNAL,808(2).
MLA	Yin, Qian-Qing,et al."CORRELATION ANALYSIS BETWEEN TIBET AS-gamma TeV COSMIC RAY AND WMAP NINE-YEAR DATA".ASTROPHYSICAL JOURNAL 808.2(2015).