The Messenger 115
March 2004

High Redshift Galaxies and the Sources of Reionization

Matthew D. Lehnert [1] & Malcolm Bremer [2]

[1] Max-Planck-Institut fuer extraterrestrische Physik,Garching bei Muenchen, Germany; [2] Department of Physics, University of Bristol, U.K.

Abstract: Two of the most important issues in modern astrophysics, what reionized the hydrogen in the Universe and how the first objects formed have been addressed by a series of VLT observations. They indicate that the hydrogen was reionized by ultra violet photons from stars and not Active Galactic Nuclei, with most of the photons arising in relatively faint low mass galaxies.

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The Messenger 115March 2004

High Redshift Galaxies and the Sources of Reionization

Matthew D. Lehnert [1] & Malcolm Bremer [2]

[1] Max-Planck-Institut fuer extraterrestrische Physik,Garching bei Muenchen, Germany; [2] Department of Physics, University of Bristol, U.K.

The Messenger 115
March 2004