A new computer simulation shows the formation of galaxies with unprecedented precision, allowing astrophysicists from Heidelberg, the U.S. and England to indirectly confirm the standard model of cosmology.
Galaxies are typically comprised of several hundred billion stars and display a variety of shapes and sizes. The formation of galaxies is one of the most involved and complex problems of astrophysics.
Several views of the Illustris simulation at different scales. Astrophysicist Volker Springel (HITS) wrote the AREPO code that made this simulation possible.
In cooperation with an international team of scientists at the MIT, Harvard University and other institutions, scientists at the Heidelberg Institute for Theoretical Studies (HITS) have now succeeded in simulating the physics of galaxy formation in a vast region of space with very high accuracy.
In the journal Nature, they report that the calculation yielded for the first time a realistic mix of elliptical and spiral galaxies. Moreover, the simulation can explain the enrichment of heavy elements (so-called “metals”) in neutral hydrogen gas. In addition, the calculated galaxies are distributed in space as observed with telescopes.
The “Illustris” simulation project produced more than 200 terabyte of data and required the combined power of more than 8,000 processors for several months. The simulation was possible thanks to the AREPO code for cosmological structure formation, which was developed at HITS, and the supercomputers CURIE in France and SuperMUC in Germany. The virtual universe that the scientists created allows a variety of novel predictions as well as comprehensive tests of cosmological theories of galaxy formation.
The standard model of cosmology is based on the hypothesis that the Universe is dominated by unknown forms of matter and energy. We do not know the true physical nature of dark matter and dark energy yet, but their impact can be understood with the help of supercomputers.
Previous simulations of the cosmos generated a cosmic web of matter concentrations that showed a passing resemblance to the galaxy distribution. However, they were not able to create elliptical and spiral galaxies and follow the small-scale evolution of interstellar gas and stars, which are closely linked to each other. With the ambitious “Illustris” project, the cosmologists have now taken a major step towards addressing this issue.
In the world’s largest hydrodynamic simulation of galaxy formation, 13 billion years of cosmic evolution were followed in a cube of 350 million light-years across, beginning 12 million years after the Big Bang. During this time, the “primordial soup” consisting of hydrogen, helium gas and dark matter formed increasingly big clumps, pulled together by gravity.
Finally, galactic stellar systems developed, whose growth is regulated by the complex interplay between radiation processes, hydrodynamic shock waves, turbulent flows, star formation, supernova explosions and the energy supplied through growing supermassive black holes. The Illustris team was able to calculate these physical processes with the AREPO code in its new supercomputer simulation. AREPO is a “moving mesh code”, which does not partition the simulated universe with a fixed grid but rather uses a movable and deformable mesh, which allows a particularly accurate processing of the vastly different size and mass scales occurring in individual galaxies.
The main simulation of the project employed more than 18 billion particles and cells and bridges a dynamic range of more than one million per space dimension – if a photo needed to resolve similarly small details, it would have to offer one million megapixels. The memory consumption of the Illustris simulation was more than 25 terabyte, and the generated data volume of over 200 terabyte sets a new record in cosmology. This flood of data makes it possible to study the evolution of about 50,000 well-resolved galaxies in detail, and to make theoretical predictions for cosmological structure formation with high accuracy.
Several years of preparatory work for the simulation paid off: For the first time, the famous “tuning fork diagram” of galaxy morphology, which goes back to Edwin Hubble, can be reproduced. Mark Vogelsberger (MIT), first author of the initial study on Illustris, published in Nature, says: “It is remarkable that the universe’s initial conditions as observed after the Big Bang can actually produce galaxies with the right sizes and shapes.”
Indirectly, the findings can be regarded as a confirmation of the standard model of cosmology. “We can finally leave the old and coarse models of galaxy formation behind and not only precisely calculate dark matter, but also the ordinary visible matter,” says Prof. Volker Springel, group leader of the HITS research group “Theoretical Astrophysics” and author of the AREPO code. He adds: “The Illustris results mark a radical change in theoretical studies of galaxy formation.”
Dr. Peter Saueressig
Heidelberg Institute for Theoretical Studies (HITS)
Prof. Dr. Volker Springel
Heidelberg Institute for Theoretical Studies (HITS) / Heidelberg University
Original scientific publication:
M. Vogelsberger, S. Genel, V. Springel, P. Torrey, D. Sijacki, D. Xu, G. Snyder, S. Bird, D. Nelson, L. Hernquist. “Properties of galaxies reproduced by a hydrodynamic simulation”, Nature, May 8, 2014, doi:10.1038/nature13316
Website of the Illustris Project (with further visualizations): http://www.illustris-project.org
Gauss Centre for Supercomputing: http://www.gauss-centre.eu
SuperMUC at the Leibniz Computing Center: http://www.lrz.de/services/compute/supermuc
AREPO-Code: V. Springel, 2010, MNRAS, 401, 791 http://mnras.oxfordjournals.org/content/401/2/791.full.html
The Heidelberg Institute for Theoretical Studies is a private, non-profit research institute. As a research institute of the Klaus Tschira Foundation, HITS conducts basic research from astrophysics to cell biology, with a focus on processing and structuring large volumes of data. The institute is jointly managed by Klaus Tschira and Andreas Reuter, and located at the campus area Schloss-Wolfsbrunnenweg 35.
http://www.h-its.org/english/press/pressreleases.php?we_objectID=1080 HITS press release
http://www.illustris-project.org Website of the Illustris project
Dr. Peter Saueressig | idw - Informationsdienst Wissenschaft
New record in materials research: 1 terapascals in a laboratory
22.07.2016 | Universität Bayreuth
Mapping electromagnetic waveforms
22.07.2016 | Max-Planck-Institut für Quantenoptik
Munich Physicists have developed a novel electron microscope that can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second.
Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and...
Breakup of continents with two speed: Continents initially stretch very slowly along the future splitting zone, but then move apart very quickly before the onset of rupture. The final speed can be up to 20 times faster than in the first, slow extension phase.phases
Present-day continents were shaped hundreds of millions of years ago as the supercontinent Pangaea broke apart. Derived from Pangaea’s main fragments Gondwana...
Scaffolding and specialised workers help with the delivery – Heidelberg biochemists gain new insights into biogenesis
A type of scaffolding on which specialised workers ply their trade helps in the manufacturing process of the two subunits from which the ribosome – the protein...
Scientists at the Helmholtz Zentrum München have developed a new mass spectrometry imaging method which, for the first time, makes it possible to analyze hundreds of metabolites in fixed tissue samples. Their findings, published in the journal Nature Protocols, explain the new access to metabolic information, which will offer previously unexploited potential for tissue-based research and molecular diagnostics.
In biomedical research, working with tissue samples is indispensable because it permits insights into the biological reality of patients, for example, in...
Chemists at the University of Basel have succeeded in using computer simulations to elucidate transient structures in proteins. In the journal Angewandte Chemie, the researchers set out how computer simulations of details at the atomic level can be used to understand proteins’ modes of action.
Using computational chemistry, it is possible to characterize the motion of individual atoms of a molecule. Today, the latest simulation techniques allow...
15.07.2016 | Event News
15.07.2016 | Event News
11.07.2016 | Event News
22.07.2016 | Information Technology
22.07.2016 | Physics and Astronomy
22.07.2016 | Life Sciences