The gaseous natal environments of GPS and CSS sources with ASKAP – FLASH

GHz-Peaked Spectrum (GPS) and compact steep spectrum (CSS) sources are thought to represent a young and/or confined sub-population of radio-loud active galactic nuclei (AGN) that yet evacuate their surrounding ambient interstellar gas. By studying the gaseous environments these objects, we can gain an insight into inter-dependent relationship between galaxies supermassive black holes (SMBHs). The First Large Absorption Survey in Hi (FLASH) will build census neutral atomic hydrogen (Hi) gas at intermediate cosmological redshifts. FLASH is expected detect least several hundred absorbers associated with GPS CSS sources. These provide important probe abundance kinematics line-of-sight toward radio AGN, some cases revealing infalling clouds outflows. Observations now complete for first phase Pilot early analysis has already yielded detections, including source PKS 2311-477. Optical imaging this galaxy reveals interacting system could have supplied seen absorption triggered AGN. statistically significant sample which prevalence such gas-rich interactions among be investigated.