Researchers at MPA and in other institutions worldwide devised a new way of simulating the impact of large-scale primordial perturbations in the dark matter distribution on the abundance of structures observed at late times, the so-called separate universe simulations. Using this technique, the MPA researchers recently obtained some of the most precise measurements of the local bias, confirming the known trend that more massive halos are more biased than smaller halos.
Current research at MPA
Researchers using the Atacama Large Millimeter/submillimeter Array (ALMA) successfully imaged a radio “hole” around a galaxy cluster 4.8 billion light-years away. This is the highest resolution image ever taken of such a hole caused by the Sunyaev-Zel'dovich effect (SZ effect). The image proves ALMA’s high capability to investigate the distribution and temperature of gas around galaxy clusters through the SZ effect.
Why do galaxies in enormous galaxy clusters look different from normal, isolated galaxies? To answer this question, an international research team led by MPA has created the Hydrangea simulations, a suite of 24 high-resolution cosmological hydrodynamic simulations of galaxy clusters containing over 20,000 individual galaxies. These simulations provide astrophysicists with a powerful new tool to understand how galaxies formed and evolved in one of the most extreme environments of our Universe.
Researchers from the Max Planck Institute for Astrophysics and the University of Amsterdam just published the most precise analysis so far of the fluctuations in the gamma-ray background. They used more than six years of data gathered by the Fermi Large Area Telescope and found two different source classes contributing to the gamma-ray background. No traces of a contribution of dark matter particles were found in the analysis.