THE APPLICATION OF CONTINUOUS WAVELET TRANSFORM BASED FOREGROUND SUBTRACTION METHOD IN 21 cm SKY SURVEYS

	THE APPLICATION OF CONTINUOUS WAVELET TRANSFORM BASED FOREGROUND SUBTRACTION METHOD IN 21 cm SKY SURVEYS
	Gu, Junhua 1; Xu, Haiguang 2; Wang, Jingying 2; An, Tao 3,4; Chen, Wen 2
刊名	ASTROPHYSICAL JOURNAL
	2013-08-10
卷号	773 期号:1
关键词	cosmology: theory dark ages, reionization, first stars methods: data analysis radio lines: general
ISSN号	0004-637X
通讯作者	Gu,JH
英文摘要	We propose a continuous wavelet transform based non-parametric foreground subtraction method for the detection of redshifted 21 cm signal from the epoch of reionization. This method works based on the assumption that the foreground spectra are smooth in frequency domain, while the 21 cm signal spectrum is full of saw-tooth-like structures, thus their characteristic scales are significantly different. We can distinguish them in the wavelet coefficient space easily and perform the foreground subtraction. Compared with the traditional spectral fitting based method, our method is more tolerant to complex foregrounds. Furthermore, we also find that when the instrument has uncorrected response error, our method can also work significantly better than the spectral fitting based method. Our method can obtain similar results with the Wp smoothing method, which is also a non-parametric method, but our method consumes much less computing time.
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]	REIONIZATION EPOCH ; SPECTRAL TURNOVER ; POWER SPECTRUM ; RADIO-SOURCES ; 21-CM EPOCH ; SIMULATIONS ; CONSTRAINTS ; TEMPERATURE ; TOMOGRAPHY ; SIGNAL
收录类别	SCI
语种	英语
WOS记录号	WOS:000322531900038
公开日期	2014-05-22
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/10107]
专题	紫金山天文台_期刊（老文献）
作者单位	1.Natl Astron Observ CAS, Beijing, Peoples R China 2.Shanghai Jiao Tong Univ, Shanghai 200030, Peoples R China 3.Shanghai Astron Observ CAS, Shanghai 200030, Peoples R China 4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Gu, Junhua,Xu, Haiguang,Wang, Jingying,et al. THE APPLICATION OF CONTINUOUS WAVELET TRANSFORM BASED FOREGROUND SUBTRACTION METHOD IN 21 cm SKY SURVEYS[J]. ASTROPHYSICAL JOURNAL,2013,773(1).
APA	Gu, Junhua,Xu, Haiguang,Wang, Jingying,An, Tao,&Chen, Wen.(2013).THE APPLICATION OF CONTINUOUS WAVELET TRANSFORM BASED FOREGROUND SUBTRACTION METHOD IN 21 cm SKY SURVEYS.ASTROPHYSICAL JOURNAL,773(1).
MLA	Gu, Junhua,et al."THE APPLICATION OF CONTINUOUS WAVELET TRANSFORM BASED FOREGROUND SUBTRACTION METHOD IN 21 cm SKY SURVEYS".ASTROPHYSICAL JOURNAL 773.1(2013).