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