Discovery of a z=7 Galaxy to Uncover the Epoch of Reionization

Details Discovery of a z=7 Galaxy to Uncover the Epoch of Reionization Discovery of a z=7 Galaxy to Uncover the Epoch of Reionization

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007asthe.100...25o&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 100, No. 1, p. 25 - 33 (2007)

Astronomy and Astrophysics

Astronomy

Galaxy Formation, Lyman Alpha Emitter, Big Bang

Scientific paper

We discovered the most distant Lyman Alpha Emitter (LAE) az z = 6.96, showing that galaxy formation was in progress just 750 Myr after the Big Bang. At z < 5.7, the number density of observed LAEs does not vary much. However, a recent observation reported it decreased by a factor of 0.4 - 0.6 from z = 5.7 to 6.6. We also found the density became even 0.18 - 0.36 times smaller from z = 6.6 to 7. This suggests either the first faint galaxies were forming, or neutral hydrogen during the reionization was absorbing light from galaxies, or suggests both events were occurring simultaneously.

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