IAU General Assembly 2006

Joint Discussion 07 

The Universe at z>6

17-18 August 2006

The exploration of the earliest phase of star and galaxy formation after the Big Bang remains an important challenge of contemporary astrophysics and represents a key science driver for numerous future facilities. During this phase the first stars and galaxies appear and start to light up and ionize the then neutral Universe ending thereby the so called cosmic dark ages and leading progressively to the complete reionization we observe now at redshift z ~ 6. Important theoretical and numerical advances have been made in the modeling of the early Universe. Also, it has recently become possible to obtain direct observations of galaxies, quasars, and the intergalactic medium (IGM) at redshift z ~ 6. Furthermore new optical to near-IR observations using ground-based and space-borne telescopes are now opening up the view to even higher redshift, directly probing for the first time galaxies during the first billion years after the Big Bang.
This Joint Discussion will be a forum to present and discuss the latest results both from numerical modeling and from observations in this rapidly advancing field.

The major topics to be discussed are:

  • Galaxies at z > 6

  • Interstellar and Intergalactic Medium at z > 6
  • Quasars at z > 6
  • Observational approaches to z > 6: deep fields, lensing clusters, gamma-ray bursts to probe the early Universe, search techniques
  • Star formation in the early Universe (simulations)
  • Feedback mechanisms at high-z at various scales (galactic and IGM) including galaxy outflows
  • Early chemical evolution of the Universe
  • Cosmic reionization (simulations, observational constraints)
Web-design courtesy of C. Leitherer. Last modified: 30-August-2005.
This website is maintained by Daniel Schaerer.
Site on "Massive star forming regions from the local Univers to high redshift"