Seminars and Colloquia at ESO Garching and on the campus
The Perseverance rover landed on the floor of an ancient martian lake on February 18, 2021. After confirming complete functionality of the rover and demonstrating the capabilities of the Ingenuity helicopter, the rover began its science investigations in earnest. The rover has now traversed almost 3 km, exploring rocks on the crater floor. Early data suggest that at least some of these rocks are lava flows with pervasive aqueous alteration. A major milestone was achieved in early September when the first samples for possible Earth return were successfully cored, sealed, and stored on the rover. I will discuss the mission's goals, activities and preliminary results.
Galaxy clusters are the largest gravitationally bound structures in the universe. According to large scale structure formation scenarios, they are hierarchically formed by mergers of smaller scale structures, which are the most energetic (10^65 ergs) processes in the universe that drive shocks and turbulence into the intracluster medium (ICM). Thermodynamical properties of the X-ray emitting ICM are sensitive probes of these dynamic activities. Although we have advanced X-ray satellites to observe these phenomena, there are caveats in interpreting their data; the most challenging one being the characterization of the background. In this talk, I will present our techniques and approaches to obtain the true data of clusters of galaxies from the X-ray mission NuSTAR, which suffers from scattered light, and share the process of how we deduce the real emission on a working example of the cluster Abell 3395.