Seminar: The competition between supernova dust production, interstellar growth and dust destruction processes in nearby galaxies

  • Date: –15:00
  • Location: Cyberspace Zoom
  • Lecturer: Ilse De Looze, Ghent University, Belgium
  • Contact person: Sofia Ramstedt
  • Seminarium

Scaling laws of dust, HI gas and metal mass are crucial to our understanding of the build-up of galaxies through their enrichment with metals and dust. We analyse the scaling relations for a diverse nearby galaxy sample, and interpret them using a set of Dust and Element evolUtion modelS (DEUS) within a Bayesian framework to enable a rigorous search of the full N-dimensional parameter space. We find that the scaling laws can be reproduced with efficient stellar dust production, relatively low grain growth efficiencies, and long dust lifetimes. The origin of dust in our nearby galaxy sample contradict earlier studies that require more than 90% of the dust to be produced through grain growth. Our results provide an important step towards solving the conundrum on whether or not grains can grow efficiently in the interstellar medium.