PROBING REIONIZATION WITH THE CROSS-POWER SPECTRUM OF 21 cm AND NEAR-INFRARED RADIATION BACKGROUNDS
文献类型：期刊论文
| 作者 | Mao, Xiao-Chun
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-08-01 |
| 卷号 | 790期号:2 |
| 关键词 | cosmology: theory diffuse radiation intergalactic medium large-scale structure of universe |
| 英文摘要 | The cross-correlation between the 21 cm emission from the high-redshift intergalactic medium and the near-infrared (NIR) background light from high-redshift galaxies promises to be a powerful probe of cosmic reionization. In this paper, we investigate the cross-power spectrum during the epoch of reionization. We employ an improved halo approach to derive the distribution of the density field and consider two stellar populations in the star formation model: metal-free stars and metal-poor stars. The reionization history is further generated to be consistent with the electron-scattering optical depth from cosmic microwave background measurements. Then, the intensity of the NIR background is estimated by collecting emission from stars in first-light galaxies. On large scales, we find that the 21 cm and NIR radiation backgrounds are positively correlated during the very early stages of reionization. However, these two radiation backgrounds quickly become anti-correlated as reionization proceeds. The maximum absolute value of the cross-power spectrum is vertical bar Delta(2)(21)(,NIR)vertical bar similar to 10(-4) mK nW m(-2) sr(-1), reached at l similar to 1000 when the mean fraction of ionized hydrogen is (x) over bar (i) similar to 0.9. We find that Square Kilometer Array can measure the 21 cm-NIR cross-power spectrum in conjunction with mild extensions to the existing CIBER survey, provided that the integration time independently adds up to 1000 and 1 hr for 21 cm and NIR observations, and that the sky coverage fraction of the CIBER survey is extended from 4 x 10(-4) to 0.1. Measuring the cross-correlation signal as a function of redshift provides valuable information on reionization and helps confirm the origin of the "missing" NIR background. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000339115800065 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6603]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mao, Xiao-Chun. PROBING REIONIZATION WITH THE CROSS-POWER SPECTRUM OF 21 cm AND NEAR-INFRARED RADIATION BACKGROUNDS[J]. ASTROPHYSICAL JOURNAL,2014,790(2). |
| APA | Mao, Xiao-Chun.(2014).PROBING REIONIZATION WITH THE CROSS-POWER SPECTRUM OF 21 cm AND NEAR-INFRARED RADIATION BACKGROUNDS.ASTROPHYSICAL JOURNAL,790(2). |
| MLA | Mao, Xiao-Chun."PROBING REIONIZATION WITH THE CROSS-POWER SPECTRUM OF 21 cm AND NEAR-INFRARED RADIATION BACKGROUNDS".ASTROPHYSICAL JOURNAL 790.2(2014). |
入库方式： OAI收割
来源：国家天文台
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