Authors: Wise, J. et al (2012)
Summary: Using the AMR code ENZO, coupled with a ray-tracing radiative transfer solver, they study how radiation pressure affects the star formation history and growth of an early low-mass galaxy. They run three models, one with only primordial cooling (base model), one which also includes metal cooling (MC model), and one which includes metal cooling, momentum transfer from ionizing radiation, and an H2 dissociating radiation background (RP model). They then study how the metal cooling and radiation pressure affect the internal gas dynamics, the chemo-thermal state of the ISM, the ejecta and outflows, and the star formation history in the three models.
They find that the MC model overcools the gas, which traps the metals in a small region and creates an extremely metal rich dwarf galaxy, which is at odds with observed local dwarfs. When including the RP, however, the SFR is reduced, and the RP adds turbulence, and mixes the SNe ejecta throughout the ISM, preventing over-cooling. This model creates a galaxy which matches the local dwarf mass-metallicity relation.
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.