Metal-Strong Gas Inflows at the Outskirts of Quasar Host Galaxies
How associated redshifted (infalling) absorption-line systems trace metal-enriched gas at tens of kiloparsecs from a quasar's supermassive black hole. Students learn how multi-ion absorption (Si IV, N V, H I Lyman series) resolved into kinematic components, combined with photoionization modeling, constrains the metallicity, density and distance of the inflowing gas, and how a strong-Si-IV / weak-Lyman signature identifies in situ, stellar-driven metal-strong inflows.
2501.00311
This paper analyzes a redshifted (infalling) associated absorption-line system at z=3.1448 in the VLT/UVES spectrum of the quasar SDSS J1220+0923 (systemic z=3.1380), detected in N V, N III, C IV, C …