Dutch researcher Alessia Gualandris developed the algorithm for this in cooperation with the Astronomical Institute "Anton Pannekoek" and the Amsterdam Informatics Institute. The outcomes of this groundbreaking research provide convincing evidence for the relationship between galactic nuclei, heavy black holes and ultrafast stars in the Milky Way.
Galactic nuclei are the cores of galaxies, groups of thousands to millions of stars that are held together by gravity. As stars in the nucleus are so close together, interactions readily occur. If ultraheavy black holes (black holes several million times heavier than the sun) are also involved, stars can be slung out of the galaxy (for example the Milky Way) at speeds of more than one thousand kilometres per second. The astrophysical reasons for this are simple but can only be demonstrated with detailed calculations on specially developed computers.
The interdisciplinary research team of which Gualandris was a member (and that cooperated with Japanese, German and US researchers) spent the past four years developing algorithms and special computers in order to accurately calculate the dynamic and internal evolution of a galactic nucleus. However, these calculations can only be performed if the interactions between all of the stars are very accurately described. Gualandris developed a special new algorithm to perform these calculations efficiently on a parallel computer. With this it was at last possible to simulate systems of more than one million stars.
The research results are important for further research into galaxies, black holes and the interaction between these. Dense stellar systems like star clusters or galaxies are fascinating for both astrophysicists and computer scientists due to their enormous physical diversity and because calculations of their high mobility are numerically very complex. Up until now these calculations were difficult to perform as these systems are unsuitable for analytical methods and approximations are not accurate enough. With Gualandris' method the numerical problems have been solved and the origin of ultrafast stars in the Milky Way can be explained.
Alessia Gualandris’ research was funded by NWO.
Kim van den Wijngaard | alfa
Stealth Virus for Cancer Therapy
31.01.2018 | Universität Zürich
New formulas for exploring the age structure of non-linear dynamical systems
23.01.2018 | Max-Planck-Institut für Biogeochemie
Quantum computers may one day solve algorithmic problems which even the biggest supercomputers today can’t manage. But how do you test a quantum computer to...
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
22.02.2018 | Life Sciences
22.02.2018 | Physics and Astronomy
22.02.2018 | Earth Sciences