Observing neutral hydrogen above redshift 6

The "global" Perspective

Judd Bowman, Alan E E Rogers, Jacqueline N. Hewitt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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<z<25), the mean brightness temperature should probe the spin temperature of neutral hydrogen in the IGM. Measuring the (of order 10 mK) mean brightness temperature of the redshifted 21 cm line as a function of frequency (and hence redshift) would chart the early evolution of galaxies through the heating and ionizing of the IGM by their stellar populations. Experiments are already underway to accomplish this task or, at least, provide basic constraints on the evolution of the mean brightness temperature. We provide a brief overview of one of these projects, the Experiment to the Detect the Global EOR Signature (EDGES), and discuss prospects for future results.

Original languageEnglish (US)
Title of host publicationAIP Conference Proceedings
Pages87-89
Number of pages3
Volume1035
DOIs
StatePublished - 2008
Externally publishedYes
EventThe Evolution of Galaxies Through the Neutral Hydrogen Window - Arecibo, Puerto Rico
Duration: Feb 1 2008Feb 3 2008

Other

OtherThe Evolution of Galaxies Through the Neutral Hydrogen Window
CountryPuerto Rico
CityArecibo
Period2/1/082/3/08

Fingerprint

intergalactic media
brightness temperature
hydrogen
Earth orbital rendezvous
temperature probes
galaxies
spin temperature
clumps
charts
filaments
universe
time measurement
signatures
heating
shift

Keywords

  • Cosmology
  • Hydrogen
  • Intergalactic medium
  • Reionization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Bowman, J., Rogers, A. E. E., & Hewitt, J. N. (2008). Observing neutral hydrogen above redshift 6: The "global" Perspective. In AIP Conference Proceedings (Vol. 1035, pp. 87-89) https://doi.org/10.1063/1.2973620

Observing neutral hydrogen above redshift 6 : The "global" Perspective. / Bowman, Judd; Rogers, Alan E E; Hewitt, Jacqueline N.

AIP Conference Proceedings. Vol. 1035 2008. p. 87-89.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bowman, J, Rogers, AEE & Hewitt, JN 2008, Observing neutral hydrogen above redshift 6: The "global" Perspective. in AIP Conference Proceedings. vol. 1035, pp. 87-89, The Evolution of Galaxies Through the Neutral Hydrogen Window, Arecibo, Puerto Rico, 2/1/08. https://doi.org/10.1063/1.2973620
Bowman J, Rogers AEE, Hewitt JN. Observing neutral hydrogen above redshift 6: The "global" Perspective. In AIP Conference Proceedings. Vol. 1035. 2008. p. 87-89 https://doi.org/10.1063/1.2973620
Bowman, Judd ; Rogers, Alan E E ; Hewitt, Jacqueline N. / Observing neutral hydrogen above redshift 6 : The "global" Perspective. AIP Conference Proceedings. Vol. 1035 2008. pp. 87-89
@inproceedings{c0625605cbc243fd998dfa1ef47cd894,
title = "Observing neutral hydrogen above redshift 6: The {"}global{"} Perspective",
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",
keywords = "Cosmology, Hydrogen, Intergalactic medium, Reionization",
author = "Judd Bowman and Rogers, {Alan E E} and Hewitt, {Jacqueline N.}",
year = "2008",
doi = "10.1063/1.2973620",
language = "English (US)",
isbn = "9780735405585",
volume = "1035",
pages = "87--89",
booktitle = "AIP Conference Proceedings",

}

TY - GEN

T1 - Observing neutral hydrogen above redshift 6

T2 - The "global" Perspective

AU - Bowman, Judd

AU - Rogers, Alan E E

AU - Hewitt, Jacqueline N.

PY - 2008

Y1 - 2008

N2 - 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

AB - 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

KW - Cosmology

KW - Hydrogen

KW - Intergalactic medium

KW - Reionization

UR - http://www.scopus.com/inward/record.url?scp=51149114585&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=51149114585&partnerID=8YFLogxK

U2 - 10.1063/1.2973620

DO - 10.1063/1.2973620

M3 - Conference contribution

SN - 9780735405585

VL - 1035

SP - 87

EP - 89

BT - AIP Conference Proceedings

ER -