H i Absorption in Low-power Radio AGNs Detected by FAST

We report the discovery of three HI absorbers toward low-power radio active galactic nuclei (AGNs) in a pilot absorption survey with Five-hundred-meter Aperture Spherical Telescope (FAST). Compared to past studies, FAST observations have explored lower powers by $\sim$0.4 dex and detected these weakest at given redshifts. By comparing gas properties kinematics sources along powers, we aim explore interplay between AGN surrounding interstellar medium (ISM). brighter similar redshifts, our suggest slightly detection rate lines ($\sim$$11.5\%$) AGNs $\text{log}(P_{\text{1.4 GHz}}/\text{W Hz}^{-1})=21.8-23.7$. The Hz}^{-1})<23$ $\sim$$6.7\%$. Due incompleteness sample, rates may represent limits. selection more extended dilution emission redshifts contribute lines. These present relatively narrow line widths comparable column densities consistent previous observations. One absorber has symmetric profile large velocity offset, while other two show asymmetric profiles that can be decomposed into multiple components, suggesting various possibilities origins kinematics. connections rotating disks, outflows, clouds, fueling AGN, jet-ISM interactions, which will further investigated upcoming systematic spatially resolved