This is the astro-ph blog of the Theoretical Modelling of Cosmic Structures group (TMoX) at the Max-Planck-Institute for Extraterrestrial Physics. We are an independent Max-Planck Research Group focusing on the various aspects in the formation and evolution of galaxies. Part of our focus is on the formation and evolution of early-type galaxies, super-massive black holes, the formation of the first structures in the universe and the enrichment history of the Universe. We are theoreticians using analytic modelling as well as numerical simulations in our work.

The CosmologyCake blog is dedicated to the discussion of research papers and current developments. We will regularly post interesting papers and comment on them. Feel free to leave your comments as well. We encourage authors of discussed papers to post replies if they wish to. Our aim is to provide a platform to discuss recent astro-ph papers within a wider audience. Please feel free to send papers you would like to be discussed to us at

27 January 2011

On Lyman-limit Systems

On Lyman-limit Systems and the Evolution of the Intergalactic Ionizing Background
Authors: Matthew McQuinn, S. Peng Oh, Claude-Andre Faucher-Giguere

The authors use cosmological simulations to study the properties of Lyman-limit systems at 3 < z < 6 and the relation between the ionising emissivity of galaxies and the amplitude of the intergalactic ionising background. This could explain the rapid decrease in the Ly-alpha forest transmission observed around z=6 without invoking reionisation.

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