An Attenuation Bump at z=9.3: Probing Dust Diversity at Cosmic Dawn
Researchers identified a UV attenuation bump in a galaxy at high redshift (z=9.33) that is extremely rare, probing dust properties only 500 million years after the Big Bang. Analysis using Drude profiles and joint modeling confirmed the bump's characteristics, showing it is blueshifted compared to Milky Way features. This diversity suggests structured UV attenuation was present at Cosmic Dawn, implying dust carriers were already chemically diverse early on.