The Ultimately Large Telescope (ULT) is a concept for a new telescope designed to observe the first stars in the universe (population 3 stars) – Image credit: NASA
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SAZERAC2020 | 5A | Anna Schauer
The influence of streaming velocities and Lyman-Werner radiation on the formation of Pop III stars The first stars form in small galaxies, so-called minihaloes. In order to host Pop III stars, they have to cross a minimum mass threshold in the range of a few 10^5M⊙−10^7M⊙, depending on the large scale streaming velocity in their creation region. A second effect, Lyman-Werner radiation, influences the minimum and average halo mass for star formation as well. With hydrodynamical simulations, we tested which of the two effects is dominant, and find streaming velocities to play a bigger role than Lyman-Werner radiation. In my talk, I will give an overview of my numerical results and provide a physical explanation thereof. Only by understanding the combination of these effects, observational signatures like the 21-cm signal can be interpreted correctly.