NAOC Open IR  > 星系宇宙学研究部
Searching for the earliest galaxies in the 21 cm forest
Xu YiDong2,3,4; Ferrara, Andrea1; Kitaura, Francisco S.1; Chen XueLei4,5
AbstractWe 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 (nu) ) distribution and flux correlation function, allows us to derive a simple selection criteria for candidate DGs at very high (z a (c) 1/2 8) redshift. We find that a parts per thousand 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 (nu) < 0; these objects correspond to the high-mass tail of the DG distribution at high redshift, and are embedded in large HII regions. The criterion W (nu) > 0.37 kHz instead selects a parts per thousand 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.
KeywordCosmology Dwarf Galaxies High-redshift Galaxies Radio Absorption Lines
Indexed BySCI ; ISTP
WOS IDWOS:000278695200023
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Scuola Normale Super Pisa, I-56126 Pisa, Italy
2.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
3.SISSA Int Sch Adv Studies, I-34014 Trieste, Italy
4.CAS, Natl Astron Observ China, Beijing 100012, Peoples R China
5.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Xu YiDong,Ferrara, Andrea,Kitaura, Francisco S.,et al. Searching for the earliest galaxies in the 21 cm forest[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2010,53(6):1124-1129.
APA Xu YiDong,Ferrara, Andrea,Kitaura, Francisco S.,&Chen XueLei.(2010).Searching for the earliest galaxies in the 21 cm forest.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,53(6),1124-1129.
MLA Xu YiDong,et al."Searching for the earliest galaxies in the 21 cm forest".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 53.6(2010):1124-1129.
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