The Galaxy - Dark Matter Connection


Groundbreaking optical/IR observations of the first galaxies born shortly after the Big Bang are providing us with new information about the amount of star light in early-Universe galaxies. New radio observations of neutral hydrogen gas surrounding the galaxies indicate how the star light ionizes the gas. To convert these observations into knowledge about the physical processes, we must fit physical models to the data. Galaxy observations are usually interpreted assuming that dark matter is cold and interacts only gravitationally, but mounting evidence suggests that dark matter is not cold and simple. Indeed, popular dark matter models predict large changes in the numbers and properties of galaxies in the early Universe compared to the cold dark matter paradigm.

Using the fast code GalaxyMC we will produce novel, combined constraints on dark matter physics and galaxy formation, and test the standard cold dark matter model with data from the Hubble and James Webb Space Telescopes, EUCLID, and ground-based radio telescopes such as EDGES, HERA and LOFAR, and forecast the synergistic performance of EUCLID, Roman Space Telescope, and the SKA Observatory.

This project is funded by the Swedish National Space Agency under contract 2020-00108.