Determination of z similar to 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation
文献类型：期刊论文
| 作者 | Switzer, E. R.1; Masui, K. W.1,2; Bandura, K.3; Calin, L. -M.1; Chang, T. -C.4; Chen, X. -L.5,6; Li, Y. -C.5; Liao, Y. -W.4; Natarajan, A.7; Pen, U. -L.1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2013-09-01 |
| 卷号 | 434期号:1页码:L46-L50 |
| 关键词 | galaxies: evolution large-scale structure of universe radio lines: galaxies |
| 英文摘要 | The large-scale distribution of neutral hydrogen in the Universe will be luminous through its 21 cm emission. Here, for the first time, we use the auto-power spectrum of 21 cm intensity fluctuations to constrain neutral hydrogen fluctuations at z similar to 0.8. Our data were acquired with the Green Bank Telescope and span the redshift range 0.6 < z < 1 over two fields totalling approximate to 41 deg(2) and 190 h of radio integration time. The dominant synchrotron foregrounds exceed the signal by similar to 10(3), but have fewer degrees of freedom and can be removed efficiently. Even in the presence of residual foregrounds, the auto-power can still be interpreted as an upper bound on the 21 cm signal. Our previous measurements of the cross-correlation of 21 cm intensity and the WiggleZ galaxy survey provide a lower bound. Through a Bayesian treatment of signal and foregrounds, we can combine both fields in auto-and cross-power into a measurement of Omega(H I)b(H I) = [0.62(0.15)(+0.23)] x 10(-3) at 68 per cent confidence with 9 per cent systematic calibration uncertainty, where Omega(H I) is the neutral hydrogen (H I) fraction and b(H I) is the HI bias parameter. We describe observational challenges with the present data set and plans to overcome them. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000326875900010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5978]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada 2.Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada 3.McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada 4.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China 7.Carnegie Mellon Univ, Dept Phys, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA |
| 推荐引用方式 GB/T 7714 | Switzer, E. R.,Masui, K. W.,Bandura, K.,et al. Determination of z similar to 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(1):L46-L50. |
| APA | Switzer, E. R..,Masui, K. W..,Bandura, K..,Calin, L. -M..,Chang, T. -C..,...&Voytek, T. C..(2013).Determination of z similar to 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(1),L46-L50. |
| MLA | Switzer, E. R.,et al."Determination of z similar to 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.1(2013):L46-L50. |
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来源：国家天文台
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