Do baryons dominate the centres of high-redshift galaxies?

Joss Bland-Hawthorn (Sydney Institute for Astronomy, University of Sydney) - Salle NEF (Mont Gros)

Abstract:

NFW would have us believe that dark matter dominates the centres of galaxies, but this has never been observed in massive galaxies, and certainly not in the Milky Way where baryons dominate out to at least 10 kpc in radius. So what about early galaxies? Can we find NFW cusps here that were subsequently wiped out? This is looking increasingly unlikely as well -- baryons may have always dominated the inner parts of galaxies. I will examine implications of baryon domination that may be testable with JWST deep fields (e.g. JADES) in the coming months.