For the past couple of years, there has been a heated debate between astronomers: Some authors claim to have seen an unidentified emission line in the spectra of galaxy clusters that could be linked to so-called sterile neutrinos, one of the particle candidates for dark matter. A recent analysis of archive Chandra X-ray data on 33 galaxy clusters, however, shows no sign of this line and presents tight upper limits on the properties of such dark matter.
What are the properties of Dark Energy? Scientists are one step closer in answering this question with the largest three-dimensional map of the universe so far: This map contains 1.2 million galaxies in a volume spanning 650 cubic billion light years. Hundreds of scientists from the Sloan Digital Sky Survey III (SDSS-III) – including researchers at MPE and MPA - used this map to make one of the most precise measurements yet of dark energy. They found excellent agreement with the standard cosmological model and confirmed that dark energy is highly consistent with a cosmological constant.
A rotationally supported disk can only form in a dense, collapsing cloud of gas and dust with a magnetic field, if the tiny grains are removed from the cloud by growing or coagulating into bigger grains. This is the result from a new study published by researchers at the MPE and other institutions. The more realistic simulations now take into account non-ideal magneto-hydrodynamics and ionization chemistry to form a rotationally supported protostellar disk.
A team of European astronomers has achieved a crucial milestone for testing Einstein's theory of general relativity with the closest supermassive black hole in the centre of our own galaxy. For the first time, the newly installed GRAVITY instrument has been used together with ESO's Very Large 8m Telescopes to observe a star orbiting the black hole on a period as short as 16 years. Both the target star and a reference star nearby show no signs of being binaries – making future measurements much less complex.
An international team of astronomers have found that there are far more planets of the hot Jupiter type than expected in a cluster of stars called Messier 67. This surprising result was obtained after long-term observations using a number of telescopes and instruments, which led to the discovery of three giant planets.
An international group of scientists has detected for the first time the prebiotic molecule PO in star-forming regions. This molecule plays a key role in the double helix structure of DNA, and is therefore directly linked to the origin of life in the Universe.