The Ultimately Large Telescope

Astronomers from The University of Texas at Austin had found that a telescope idea shelved by NASA that can solve a problem that no other telescope can. Learn more: THE ULTIMATELY LARGE TELESCOPE https://www.spacetv.net/the-ultimately-large-telescope/ THE MOON https://www.spacetv.net/the-moon/ INFRARED ASTRONOMY https://www.spacetv.net/infrared-astronomy/ Written and edited for SPACETV by Silviu Lazar https://vimeo.com/user42842172 Follow SPACETV on Twitter https://twitter.com/SPACETVnet​ Join us on Facebook https://www.facebook.com/spacetv.net​ and on Tiktok https://www.tiktok.com/@spacetvnet Sources: https://arxiv.org/pdf/2007.02946.pdf https://www.nasa.gov/directorates/spacetech/niac/2020_Phase_I_Phase_II/lunar_crater_radio_telescope/ https://www.jpl.nasa.gov/news/lunar-crater-radio-telescope-illuminating-the-cosmic-dark-ages https://www.universetoday.com/146888/what-telescope-will-be-needed-to-see-the-first-stars-in-the-universe-the-ultimately-large-telescope/ Credits: NASA's Goddard Space Flight Center/CI Lab NASA's Goddard Space Flight Center Scientific Visualization Studio European Southern Observatory The University of Texas at Austin NASA/WMAP Science Team NASA/Swift Saptarshi Bandyopadhyay Music: https://www.purple-planet.com SPACETV.NET 2021

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.