Published August 1, 2008
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Observing Neutral Hydrogen Above Redshift 6: The "Global" Perspective
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Abstract
Above redshift 6, the dominant source of neutral hydrogen in the Universe shifts from localized clumps in and around galaxies and filaments to a pervasive, diffuse component of the intergalactic medium (IGM). This transition tracks the global neutral fraction of hydrogen in the IGM and can be studied, in principle, through the redshifted 21 cm hyperfine transition line. During the last half of the reionization epoch, the mean (global) brightness temperature of the redshifted 21 cm emission is proportional to the neutral fraction, but at earlier times (10
Additional Information
© 2008 American Institute of Physics. Issue Date: 1 August 2008. This work was supported by the Massachusetts Institute of Technology, School of Science, and by the NSF through grant AST-0457585. JDB is supported by NASA through Hubble Fellowship grant HF-01205.01-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555.Attached Files
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- Eprint ID
- 12424
- Resolver ID
- CaltechAUTHORS:BOWaipcp08a
Funding
- Massachuttes Institute of Technology
- NSF
- AST-0457585
- NASA
- HF-01205.01-A
- NASA
- NAS 5-26555
Dates
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2008-11-25Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field
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- AIP Conference Proceedings
- Series Volume or Issue Number
- 1035