UV irradiated hydrogenated amorphous carbon (HAC) materials as a carrier candidate of the interstellar UV bump at 217.5 nm

Abstract

Context. Hydrogenated amorphous carbon (HAC) materials have been considered as a laboratory analog of cosmic carbonaceous nanoparticles in the interstellar medium (ISM). In the diffuse ISM, UV radiation can modify the electronic and atomic structure of HAC materials.