by David Schlachtberger

A Disk-Disk Major Merger Event in a Cosmological Hydrodynamical Zoom-Simulation


The idea of the hierarchical growth of structures has shaped our understanding of the formation of galaxies in the universe for many years, but due to numerical complexity a detailed study of the evolution of those galaxies from high redshift to present day has been a challenge so far. With larger computational powers and improved numerical methods available that include detailed baryonic physics, the goal of understanding the formation of the large variety of galaxies at the present day and their connections with each other has come into reach. With the aim to understand the formation of galaxies and especially the impact of the gas component and the feedback on the evolution of elliptical galaxies, we performed high-resolution zoom simulations of galaxies selected from a large cosmological box (Gpc in size), which are forming at the border or inside a void structure at present day. The movie presented in this highlight shows, within a self consistent cosmological context, the formation of a disk galaxy from a redshift of z=10 to z=0.45, where it suffers a major merging event with another massive disk galaxy. This causes a starburst and changes the morphology of the two galaxies that then form a single spheroidal galaxy. This is an event that can be seen in the present day universe, for example in the famous Mice Galaxies or the Antennae Galaxies. Our spheroidal galaxy undergoes another dynamical event during the last 2 Gyrs of its life until the present day that is also a major component of galaxy evolution: a massive dry minor merger. This merger leaves shell-like structures around the galaxy as a signature that is visible for about 200-500 Myrs, a phenomenon that can be observed at present day, for example in the Arp 227 Galaxy. 
This galaxy is part of the work of the Magneticum Team at the CAST Group of the University observatory in Munich. Feel free to use this Movie for educational purposes. Computations where performed within the SuperCAST project on SuperMUC, located at the LRZ. 


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The corresponding animations can be found here: 

high resolution movie
low resolution movie 

 

Highlights

   A UNIQUE DATA CENTRE FOR COSMOLOGICAL SIMULATIONS
Clusters of Small Clumps in High-Redshift Disk Galaxies
Magneticum Pathfinder: The evolution of the universe in an unmatched extend
The complex Interplay between Spin, Mass, and Morphology in Galaxies The complex Interplay between Spin, Mass, and Morphology in Galaxies
Magneticum sheds new light on recently discovered Fast Radio Bursts (FRBs) Magneticum sheds new light on recently discovered Fast Radio Bursts (FRBs)
A Disk-Disk Major Merger Event in a Cosmological Hydrodynamical Zoom-Simulation A Disk-Disk Major Merger Event in a  Cosmological Hydrodynamical Zoom-Simulation
The formation of filamentary bundles in turbulent molecular
  clouds The formation of filamentary bundles in turbulent molecular clouds
G2 modelled as a mass-losing source of gas G2 modelled as a mass-losing source of gas
Supernova-driven galactic winds Supernova-driven galactic winds
Dark-halo spheroid conspiracy The Dark Halo-Spheroid Conspiracy and the Origin of Elliptical Galaxies
Julius Donnert receives PhD award of AG Phd Award 2012 of the Astronomische Gesellschaft
CAST group outing 2012 CAST group outing 2012
Evolution of the Galactic Centre Cloud G2 Evolution of the Galactic Centre Cloud G2
Dr.Hanna Kotarba receives the Universe PhD award Universe Cluster PhD Thesis Award 2011
Evolution of Molecular Clouds in Spiral Galaxies Evolution of Molecular Clouds in Spiral Galaxies by Clare Dobbs
Globular Clusters vs. Black Hole Mass Relation Globular Clusters Black Hole Correlation by Andreas Burkert
Cosmological Resimulations Cosmological Resimulations by Ludwig Oser
Star Formation in the Galactic Centre Star Formation in the Galactic Centre by Christian Alig
A New Model for the Antennae Galaxies A New Model for the Antennae Galaxies by Simon Karl
Simulating the Bullet Cluster Simulating the Bullet Cluster by Chiara Mastropietro
Triggered Star Formation Triggered Star Formation by Matthias Gritschneder
The Mystery of Sedna The Mystery of Sedna by Hagen Schulte in den Bäumen
The Formation of Fossil Galaxy Groups The Formation of Fossil Galaxy Groups in the hierarchical Universe by Elena D'Onghia
Molecular Cloud Formation in Colliding Flows Molecular Cloud Formation in Colliding Flows by Fabian Heitsch
Planet-Disk Interaction Comparison of hydro codes on planet-disk interaction problem by Pawel Ciecielag
Galactic Orbits Orbital Structure of Galaxies in N-Body Simulations by Roland Jesseit