Lehrstuhl für Astronomie, Universität Würzburg

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welcome to the Star Formation Lab

Ph.D. Project (status: finished)

Dissertation zur Erlangung des
naturwissenschaftlichen Doktorgrades
der Julius-Maximilians-Universität Würzburg

Simulating Star Formation and Turbulence
in Models of Isolated Disk Galaxies

Online Version (pdf)

Defense Talk (pdf)



Simulating Star Formation and Turbulence in Models of Isolated Disk Galaxies

Fluid mEchanics with Adaptively Refined Large Eddy SimulationS


We model Milky Way like isolated disk galaxies in high resolution three-dimensional hydrodynamical simulations with the adaptive mesh refinement code Enzo. The model galaxies include a dark matter halo and a disk of gas and stars. We use a simple implementation of sink particles to measure and follow collapsing gas, and simulate star formation as well as stellar feedback in some cases. We investigate two largely different realizations of star formation. Firstly, we follow the classical approach to transform cold, dense gas into stars with an fixed efficiency. These kind of simulations are known to suffer from an overestimation of star formation and we observe this behavior as well. Secondly, we use our newly developed FEARLESS approach to combine hydrodynamical simulations with a semi-analytic modeling of unresolved turbulence and use this technique to dynamically determine the star formation rate. The subgrid-scale turbulence regulated star formation simulations point towards largely smaller star formation efficiencies and henceforth more realistic overall star formation rates. More work is necessary to extend this method to account for the observed highly supersonic turbulence in molecular clouds and ultimately use the turbulence regulated algorithm to simulate observed star formation relations.

Image Credit: Markus Hupp, Astronomie (Universität Würzburg)
Click to view the animation of the evolution of a toy model galaxy with turbulence regulated star formation. Several animation attributes haven been applied to this video for visualization purposes. Therefore, scientific interpretation of the presented material is limited.

Team: (including alumni)

Jens Niemeyer, Christian Klingenberg, Wolfram Schmidt, Luigi Ipichino, Andreas Maier, Christoph Federrath, Franco Ciaraldi-Schoolmann, Markus Niklaus, Sebastian Kern, Daniel Seifried, MH



This SF-SGS project is directly related and carried out in closest collaboration with the FEARLESS project.

Additional Information:

For more information please also refer to our Project Proposal written and granted in 2006 for computational resources at the Hochleistungsrechner in Bayern (HLRB II): The SGI Altix 4700


This paper summarizes a great deal of our current and on-going endeavors. For even more more details, please contact me.
HLRB 2 Project Proposal


Publications & Material


ZAH / Institut für Theoretische Astrophysik, Universität Heidelberg (2008-01-09 @ Ralf Klessen)
"Simulating Star Formation in Isolated Disk Galaxies"

LMU / Universitäts-Sternwarte München (2006-11-30 @ Andreas Burkert)
"A FEARLESS* approach to model star formation"

Talk @ ITA

Talk @ USM

Poster Distributed European Infrastructure for Supercomputing Applications
"A New Modelling Approach for Turbulent Astrophysical Flows"
DEISA Poster
Poster Structure Formation in the Universe (Conference - Chamonix, France)
"FEARLESS* - SubGrid Scale Turbulence Modeling and Applications to Star Formation"

" Mini-Workshop on Lorentz Violation"

GK Report



Markus Hupp
M. Sc., SUNY, University at Albany, USA
Lehrstuhl für Astronomie
Universität Würzburg
Am Hubland
D-97074 Würzburg

Phone: +49 (931) 888 4972
Fax: +49 (931) 888 4603
Room 330b


Curriculum Vitae

please download my CV as Portable Document Format (PDF) MH_CurriculumVitae.pdf



Master's Thesis Project Homepage http://astro.uni-wuerzburg.de/~mshupp/apt3/index.htm
ENZO Homepage (our simulation framework) http://cosmos.ucsd.edu/enzo/
Hochleistungsrechner in Bayern (HLRB II): The SGI Altix 4700 http://www.lrz-muenchen.de/services/compute/hlrb/
Institut für Theoretische Astrophysik, Universität Heidelberg http://www.ita.uni-heidelberg.de/research/klessen/
Universitäts-Sternwarte München http://www.usm.uni-muenchen.de/index.php
Department of Physics, University at Albany, SUNY, USA http://albany.edu/physics/


The copyright of this page and its content belongs to the author. Due acknowledgement must always be made of the use of any material contained in, or derived from, this page.
2008 Markus Hupp

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