Statistical features of 21 centimeter emission from the epoch between reionization and the Gunn-Peterson transparency
文献类型：期刊论文
| 作者 | He, P; Liu, JR; Feng, LL ; Bi, HG; Fang, LZ
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2004-10-10 |
| 卷号 | 614期号:1页码:6-16 |
| 关键词 | cosmology : theory intergalactic medium large-scale structure of universe |
| ISSN号 | 0004-637X |
| 英文摘要 | We investigate the 21 cm emission from the epoch between reionization z(r) and the Gunn-Peterson transparency z(GP). According to the lognormal model of the thermal history around reionization, hydrogen clouds in z(r) > z > z(GP) are hot and a predominant part of baryonic gas is ionized, but still opaque to Lyalpha photons. Therefore, 21 cm emission is a distinctive characteristic of this epoch. We show that the 21 cm emission comes from both uncollapsed and collapsing hydrogen clouds. The spatial distribution of the brightness temperature excess deltaT(b) is highly non-Gaussian. It consists of spikes with high deltaT(b) and a low deltaT(b) area between the spikes. The field has the following statistical features: ( 1) the one-point distributions of deltaT(b) are described approximately by power-law tailed probability distribution functions; (2) the nth-order moment of deltaT(b) is increasing much faster with n than that of a Gaussian field, but slower than that of a lognormal field; ( 3) the scale-scale correlation of the deltaT(b) field is significant for all scales larger than the Jeans length of the gas. These features would be useful for distinguishing the 21 cm emission of the early clustering from the noise of foreground contamination. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SCALE-SCALE CORRELATIONS ; COLD DARK-MATTER ; LY-ALPHA FOREST ; MICROWAVE BACKGROUND POLARIZATION ; HIGH REDSHIFTS ; INTERGALACTIC MEDIUM ; LOGNORMAL MODEL ; POWER SPECTRUM ; HYDROGEN REIONIZATION ; ABSORPTION-SPECTRA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000224366900002 |
| 公开日期 | 2012-12-22 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/7715]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA 3.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China 4.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, P,Liu, JR,Feng, LL,et al. Statistical features of 21 centimeter emission from the epoch between reionization and the Gunn-Peterson transparency[J]. ASTROPHYSICAL JOURNAL,2004,614(1):6-16. |
| APA | He, P,Liu, JR,Feng, LL,Bi, HG,&Fang, LZ.(2004).Statistical features of 21 centimeter emission from the epoch between reionization and the Gunn-Peterson transparency.ASTROPHYSICAL JOURNAL,614(1),6-16. |
| MLA | He, P,et al."Statistical features of 21 centimeter emission from the epoch between reionization and the Gunn-Peterson transparency".ASTROPHYSICAL JOURNAL 614.1(2004):6-16. |
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来源：紫金山天文台
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