Searching for the earliest galaxies in the 21cm forest

作     者：Andrea FERRARA Francisco S. KITAURA 

作者机构：Scuola Normale SuperiorePiazza dei Cavalieri 756126 PisaItaly 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2010年第53卷第6期

页      面：1124-1129页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：was supported in part by a scholarship from the China Scholarship Council a research training fellowship from SISSA astrophysics sector the National Natural Science Foundation of China (Grant Nos. 10373001,10533010,10525314,and 10773001) the Knowledge Innovation Program of Chinese Academy of Sciences (Grant No. KJCX3- SYW-N2) the National Basic Research Program of China (Grant No. 2007CB8125401) 

主　　题：cosmology dwarf galaxies high-redshift galaxies radio absorption lines 

摘      要：We use a model developed by Xu,Ferrara,and Chen(Mon Not Roy Astron Soc,submitted) to compute the 21 cm line absorption signatures imprinted by star-forming dwarf galaxies(DGs) and starless minihalos(MHs). The method,based on a statistical comparison of the equivalent width(W ν ) distribution and flux correlation function,allows us to derive a simple selection criteria for candidate DGs at very high(z ≤ 8) redshift. We find that ≈18% of the total number of DGs along a line of sight to a target radio source(GRB or quasar) can be identified by the condition W ν0.37 kHz instead selects ≈11% of MHs. Selected candidate DGs could later be re-observed in the near-IR by the JWST with high efficiency,thus providing a direct probe of the most likely reionization sources.