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

11 February 2011

Synthetic Observations of Simulated AGN Jets: X-ray Cavities

Authors: Peter J. Mendygral, Sean M. O'Neill, Thomas W. Jones
Link to paper:

X-ray cavities in galaxy clusters are now commonly used to determine the mechanical energy input from radio sources. The authors provide a detailed assessment of these observational methods by computing realistic X-ray emission maps for the simulated sources, determining the cavity enthalpy as done for real observations and comparing the results to the known and directly measureable properties in the simulation. Determined cavity enthalpies are typically within a factor of 2 of the simulation values; cavity ages seem more vulnerable to projection effects and problems of the methods, in particular the buoyant rise time.

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