| Cross-Correlation Detection of Point Sources in the WMAP First Year Data |
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| 作者姓名： | Jian-Yin Nie and Shuang-Nan Zhang |
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| 作者单位： | Jian-Yin Nie1 and Shuang-Nan Zhang1，2 1 Department of Physics and Center for Astrophysics，Tsinghua University，Beijing 100084; 2 Key Laboratory of Particle Astrophysics，Institute of High Energy Physics，Chinese Academy of Sciences，Beijing 100049 |
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| 基金项目： | 国家自然科学基金;教育部资助项目;国家自然科学基金 |
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| 摘 要： | We apply a Cross-Correlation (CC) method developed previously for detecting gamma-ray point sources to the WMAP first year data by using the Point-Spread Function of WMAP and obtain a full sky CC coefficient map. We find that the CC method is a pow- erful tool to examine the WMAP foreground residuals which can be further cleaned accord- ingly. Evident foreground signals are found in the WMAP foreground cleaned maps and the Tegmark cleaned map. In this process 101 point sources are detected, and 26 of them are new sources additional to the originally listed WMAP 208 sources. We estimate the ?ux of these new sources and verify them by another method. As a result, a revised mask file based on the WMAP first year data is produced by including these new sources.
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| 关 键 词： | cosmic microwave background: WMAP—cross-correlation—radio point source |
Cross-Correlation Detection of Point Sources in the WMAP First Year Data |
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| Jian-Yin Nie and Shuang-Nan Zhang, .Cross-Correlation Detection of Point Sources in the WMAP First Year Data[J].Chinese Journal of Astronomy and Astrophysics,2007,7(2):199-208. |
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| Authors: | Jian-Yin Nie Shuang-Nan Zhang |
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| Institution: | [1]Department of Physics and Center for Astrophysics, Tsinghua University, Beijing 100084 [2]Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy ofSciences, Beijing 100049 |
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| Abstract: | We apply a Cross-Correlation (CC) method developed previously for detecting gamma-ray point sources to the WMAP first year data by using the Point-Spread Function of WMAP and obtain a full sky CC coefficient map. We find that the CC method is a pow- erful tool to examine the WMAP foreground residuals which can be further cleaned accord- ingly. Evident foreground signals are found in the WMAP foreground cleaned maps and the Tegmark cleaned map. In this process 101 point sources are detected, and 26 of them are new sources additional to the originally listed WMAP 208 sources. We estimate the ?ux of these new sources and verify them by another method. As a result, a revised mask file based on the WMAP first year data is produced by including these new sources. |
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| Keywords: | cosmic microwave background: WMAP - cross-correlation - radio point source |
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