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

1 June 2012

Stellar Disks in Aquarius Dark Matter Haloes

Authors: DeBuhr et al (2012)
Paper: here

The paper (Stellar Disks in Aquarius Dark Matter Haloes) shows results for stellar-bar formation in 4 Milky-Way-size dark matter haloes of the Aquarius project. The find that (i) the presence of a stellar component in the center of the haloes induces inner-halo contraction; (ii) 3/4 of the disks form a central bar; (iii) almost all of them experience a buckling instability with a boost of the stellar vertical velocity dispersion; (iv) when mass is reduced by at least a factor 2 no bar is formed; (v) re-orientation of the central part of the disk and halo determines warp formation.

There is not much new: just usual stellar dynamics analysis on the new Aquarius haloes.

Similar results about warps and bars might be reproduced by different phenomena (e.g. infalling satellite galaxies; dark-matter substructures; cold gas clumps; etc.)

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