Observing Neutral Hydrogen Above Redshift 6: The ``Global'' Perspective

Details Observing Neutral Hydrogen Above Redshift 6: The ``Global'' Perspective Observing Neutral Hydrogen Above Redshift 6: The ``Global'' Perspective

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1035...87b&link_type=abstract

THE EVOLUTION OF GALAXIES THROUGH THE NEUTRAL HYDROGEN WINDOW. AIP Conference Proceedings, Volume 1035, pp. 87-89 (2008).

Computer Science

Cosmology, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Galaxy Clusters, Background Radiations, Radio Telescopes And Instrumentation, Heterodyne Receivers

Scientific paper

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

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