THE APPLICATION OF CONTINUOUS WAVELET TRANSFORM BASED FOREGROUND SUBTRACTION METHOD IN 21 cm SKY SURVEYS
文献类型：期刊论文
| 作者 | Gu, Junhua1; Xu, Haiguang2; Wang, Jingying2; An, Tao3,4 ; Chen, Wen2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-08-10 |
| 卷号 | 773期号:1 |
| 关键词 | cosmology: theory dark ages methods: data analysis radio lines: general reionization first stars |
| 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. |
| 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 | 2014-09-22 |
| 源URL | [http://119.78.226.72//handle/331011/15185]  |
| 专题 | 上海天文台_空间导航与定位技术重点实验室 |
| 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). |
入库方式： OAI收割
来源：上海天文台
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