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The role of faint star forming galaxies in cosmic reionization

Jure Japelj

Évènements associés

  • Le lundi 30 janvier 2017 de 11:00 à 12:00

The epoch of cosmic reionization represents an important evolutionary stage of the Universe marking the formation of the first cosmic structures. Star forming galaxies have long been considered as the dominant sources of the cosmic ultraviolet background radiation at early epochs. However, observing and characterizing the galaxy population with significant ionizing emission has proven to be challenging. In particular, the fraction of ionizing radiation that escapes from the local environment to the intergalactic medium (escape fraction) is poorly known. I will present recent observational and theoretical efforts to understand the properties of the escape fraction of the star forming population. It has been often suggested that, on average, escape fraction could be higher for low-luminosity galaxies. The existent observational data can provide us with meaningful constraints on the escape fraction. I will show how these constraints, combined with theoretical modelling, can help us to test the dependence of escape fraction on galaxy luminosity and furthermore provide means to better understand the properties of star forming regions.