%0 Journal Article %T Revisiting the giant radio galaxy ESO 422-G028 - I. Discovery of a neutral inflow and recent star formation in a restarted giant %+ Joseph Louis LAGRANGE (LAGRANGE) %A Zovaro, Henry R. M. %A Riseley, Chris J. %A Taylor, Philip %A Nesvadba, Nicole P. H. %A Galvin, Tim J. %A Malik, Umang %A Kewley, Lisa J. %< avec comité de lecture %@ 0035-8711 %J Monthly Notices of the Royal Astronomical Society %I Oxford University Press (OUP): Policy P - Oxford Open Option A %V 509 %P 4997-5017 %8 2022 %D 2022 %Z 2107.07100 %Z 2022MNRAS.509.4997Z %R 10.1093/mnras/stab3140 %K galaxies: active %K galaxies: evolution %K galaxies: individual: ESO 422-G028 %K galaxies: ISM %K Astrophysics - Astrophysics of Galaxies %Z Sciences of the Universe [physics]Journal articles %X Giant radio galaxies provide important clues into the life cycles and triggering mechanisms of radio jets. With large-scale jets spanning 1.8 Mpc, ESO 422-G028 (z = 0.038) is a giant radio galaxy that also exhibits signs of restarted jet activity in the form of pc-scale jets. We present a study of the spatially resolved stellar and gas properties of ESO 422-G028 using optical integral field spectroscopy from the Wide-Field Spectrograph (WiFeS). In addition to the majority ${\sim} 13\, \rm Gyr$ old stellar population, ESO 422-G028 exhibits a much younger (${\lesssim} 10\, \rm Myr$ old) component with an estimated mass of $10^{7.6}\, \rm M_\odot$ that is predominantly located in the north-west region of the galaxy. Unusually, the ionized gas kinematics reveal two distinct discs traced by narrow ($\sigma _{\rm H\alpha } 100 \, \rm km\, s^{-1}$) and broad ($\sigma _{\rm H\alpha } 150 \, \rm km\, s^{-1}$) Hα emission, respectively. Both ionized gas discs are misaligned with the axis of stellar rotation, suggesting an external origin. This is consistent with the prominent interstellar Na D absorption, which traces a $1 \!-\! 3 \, \rm M_\odot \, yr^{-1}$ inflow of neutral gas from the north. We posit that an inflow of gas - either from an accretion event or a gas-rich merger - has triggered both the starburst and the restarted jet activity, and that ESO 422-G028 is potentially on the brink of an epoch of powerful active galactic nucleus (AGN) activity. %G English %2 https://insu.hal.science/insu-03656925/document %2 https://insu.hal.science/insu-03656925/file/stab3140.pdf %L insu-03656925 %U https://insu.hal.science/insu-03656925 %~ INSU %~ UNICE %~ CNRS %~ OCA %~ LAGRANGE %~ UNIV-COTEDAZUR