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 firstname.lastname@example.org.
24 February 2012
MaGICC Disks: Matching Observed Galaxy Relationships Over a Wide Stellar Mass Range
In this paper (link) the authors demonstrate that using their feedback model (note this is just stellar feedback : supernovae + heating from massive stars) in cosmological zoom simulations results in galaxies that match observed relations between a wide range of properties. A key aspect of this result is that the simulations also reproduce the way these relations scale with stellar mass, suggesting that their feedback model has a realistic efficiency over 2 orders of magnitude in stellar mass. The authors claim that it is the amount of outflow they get in their models that allows them to get the correct mass dependence. They also show that this level of outflow is supported by OVI absorption line observations (which can indicate the radial extent of metal rich gas that has been ejected from a galaxy).