Cross-correlation of 21 cm and soft X-ray backgrounds during the epoch of reionization
文献类型：期刊论文
| 作者 | Liang, Jun-Min; Mao, Xiao-Chun ; Qin, Bo; Mao Xiaochun; Qin Bo
|
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2016-08-01 |
| 卷号 | 16期号:8页码:132-U144 |
| 关键词 | cosmic background radiation cosmology: theory dark ages, reionization, first stars early Universe diffuse radiation X-rays: diffuse background |
| 英文摘要 | The cross-correlation between the high-redshift 21 cm background and the Soft X-ray Background (SXB) of the Universe may provide an additional probe of the Epoch of Reionization. Here we use semi-numerical simulations to create 21 cm and soft X-ray intensity maps and construct their cross power spectra. Our results indicate that the cross power spectra are sensitive to the thermal and ionizing states of the intergalactic medium (IGM). The 21 cm background correlates positively to the SXB on large scales during the early stages of the reionization. However as the reionization develops, these two backgrounds turn out to be anti-correlated with each other when more than similar to 15% of the IGM is ionized in a warm reionization scenario. The anti-correlated power reaches its maximum when the neutral fraction declines to 0.2-0.5. Hence, the trough in the cross power spectrum might be a useful tool for tracing the growth of HII regions during the middle and late stages of the reionization. We estimate the detectability of the cross power spectrum based on the abilities of the Square Kilometre Array and the Wide Field X-ray Telescope (WFXT), and find that to detect the cross power spectrum, the pixel noise of X-ray images has to be at least 4 orders of magnitude lower than that of the WFXT deep survey. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; STAR-FORMING GALAXIES ; POWER SPECTRUM ; INTERGALACTIC MEDIUM ; PAPER-64 CONSTRAINTS ; PROBING REIONIZATION ; NUMBER COUNTS ; CHANDRA ; QUASARS ; FLUCTUATIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000381832700015 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6795]  |
| 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 | Liang, Jun-Min,Mao, Xiao-Chun,Qin, Bo,et al. Cross-correlation of 21 cm and soft X-ray backgrounds during the epoch of reionization[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(8):132-U144. |
| APA | Liang, Jun-Min,Mao, Xiao-Chun,Qin, Bo,Mao Xiaochun,&Qin Bo.(2016).Cross-correlation of 21 cm and soft X-ray backgrounds during the epoch of reionization.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(8),132-U144. |
| MLA | Liang, Jun-Min,et al."Cross-correlation of 21 cm and soft X-ray backgrounds during the epoch of reionization".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.8(2016):132-U144. |
入库方式： OAI收割
来源：国家天文台
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