The Global 21cm Absorption from Cosmic Dawn with Inhomogeneous Gas Distribution
文献类型：期刊论文
| 作者 | Xu, Yidong1; Yue, Bin1; Chen, Xuelei1,2,3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-12-10 |
| 卷号 | 869期号:1页码:6 |
| 关键词 | cosmology: theory dark ages, reionization, first stars intergalactic medium |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aae97b |
| 英文摘要 | We make an analytical estimate of the maximum 21 cm absorption signal from the cosmic dawn, taking into account the inhomogeneity of gas distribution in the intergalactic medium (IGM) due to nonlinear structure formation. The gas located near halos is overdense but adiabatically heated, while the gas far from halos is underdense and hence cooler. The cumulative effect of adiabatic heating and cooling from this gas inhomogeneity results in a reduction in the maximum global 21 cm absorption depth by about 40% as compared with the homogeneous IGM model, assuming saturated coupling between the spin temperature of neutral hydrogen (H I) and the adiabatic gas kinetic temperature. |
| WOS关键词 | REIONIZATION ; PREDICTIONS ; HYDROGEN ; SIGNAL ; MODEL |
| 资助项目 | Chinese Academy of Sciences (CAS) Strategic Priority Research Program[XDA15020200] ; CAS Frontier Science Key Project[QYZDJ-SSW-SLH017] ; National Natural Science Foundation of China (NSFC)[11633004] ; NSFC-ISF joint research program[11761141012] ; Hundred Talents (Young Talents) program from the CAS ; NSFC[11653003] ; NSFC-CAS joint fund for space scientific satellites[U1738125] ; MoST[2016YFE0100300] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000452824300010 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; CAS Frontier Science Key Project ; CAS Frontier Science Key Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC-ISF joint research program ; NSFC-ISF joint research program ; Hundred Talents (Young Talents) program from the CAS ; Hundred Talents (Young Talents) program from the CAS ; NSFC ; NSFC ; NSFC-CAS joint fund for space scientific satellites ; NSFC-CAS joint fund for space scientific satellites ; MoST ; MoST ; Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; CAS Frontier Science Key Project ; CAS Frontier Science Key Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC-ISF joint research program ; NSFC-ISF joint research program ; Hundred Talents (Young Talents) program from the CAS ; Hundred Talents (Young Talents) program from the CAS ; NSFC ; NSFC ; NSFC-CAS joint fund for space scientific satellites ; NSFC-CAS joint fund for space scientific satellites ; MoST ; MoST ; Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; CAS Frontier Science Key Project ; CAS Frontier Science Key Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC-ISF joint research program ; NSFC-ISF joint research program ; Hundred Talents (Young Talents) program from the CAS ; Hundred Talents (Young Talents) program from the CAS ; NSFC ; NSFC ; NSFC-CAS joint fund for space scientific satellites ; NSFC-CAS joint fund for space scientific satellites ; MoST ; MoST ; Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; Chinese Academy of Sciences (CAS) Strategic Priority Research Program ; CAS Frontier Science Key Project ; CAS Frontier Science Key Project ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC-ISF joint research program ; NSFC-ISF joint research program ; Hundred Talents (Young Talents) program from the CAS ; Hundred Talents (Young Talents) program from the CAS ; NSFC ; NSFC ; NSFC-CAS joint fund for space scientific satellites ; NSFC-CAS joint fund for space scientific satellites ; MoST ; MoST |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/23909]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Xu, Yidong |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Yidong,Yue, Bin,Chen, Xuelei. The Global 21cm Absorption from Cosmic Dawn with Inhomogeneous Gas Distribution[J]. ASTROPHYSICAL JOURNAL,2018,869(1):6. |
| APA | Xu, Yidong,Yue, Bin,&Chen, Xuelei.(2018).The Global 21cm Absorption from Cosmic Dawn with Inhomogeneous Gas Distribution.ASTROPHYSICAL JOURNAL,869(1),6. |
| MLA | Xu, Yidong,et al."The Global 21cm Absorption from Cosmic Dawn with Inhomogeneous Gas Distribution".ASTROPHYSICAL JOURNAL 869.1(2018):6. |
入库方式： OAI收割
来源：国家天文台
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