SMuK 2023 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 10: Astrophysics: Cosmic Rays and Galaxies I

EP 10.6: Talk

Thursday, March 23, 2023, 12:45–13:00, ZEU/0160

Bayesian Inference of the 3D Galactic HI-Gas Density — •Laurin Söding, Philipp Mertsch, and Vo Hong Minh Phan — Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, Aachen, Germany

While other galaxies can be observed with various techniques in great detail and precision, the structure of our own galaxy is mostly obscured from view due to our vantage point. Creating a 3D map of e.g. HI gas density or magnetic fields is therefore a challenging task. We have used the 21-cm emission line from atomic hydrogen - together with a velocity model - to reconstrcut a 3D-map of the galactic distribution of HI gas using new Bayesian inference techniques. While the first results look very promising, we have characterised systematic uncertainties of the method due to, e.g. the choice of velocity model. In the future, we will strive to determine velocity fields and gas densities in a common inference machinery to obtain the best maps of the Galaxy yet.