NDLI: Searching for the earliest galaxies in the 21 cm forest

Content Provider	Springer Nature Link
Author	Xu, YiDong Ferrara, Andrea Kitaura, Francisco S. Chen, XueLei
Copyright Year	2010
Abstract	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 $_{ν}$ < 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 $_{ν}$ > 0.37 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.
Starting Page	1124
Ending Page	1129
Page Count	6
File Format	PDF
ISSN	16747348
Journal	Science in China Series G
Volume Number	53
Issue Number	6
e-ISSN	18622844
Language	English
Publisher	SP Science China Press
Publisher Date	2010-06-11
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cosmology dwarf galaxies high-redshift galaxies radio absorption lines Astronomy, Observations and Techniques Classical Continuum Physics Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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