The "Green Bean" Galaxy SDSS J224024.1--092748: Unravelling the emission signature of a quasar ionization echo
Rebecca L. Davies, Mischa Schirmer, James E. H. Turner

TL;DR
This study investigates the ionization and kinematic properties of the Green Bean Galaxy SDSS J224024.1-092748, revealing evidence of past quasar activity and shock-heated regions, thus providing insights into galaxy evolution after luminous quasar phases.
Contribution
It presents a detailed 3D spectroscopic analysis of a Green Bean Galaxy, highlighting the role of shocks and past quasar activity in shaping its ionized gas properties.
Findings
AGN responsible for over 82% of [O III] luminosity
Detection of shock-heated, turbulent gas regions
Ionized gas cloud likely a quasar outflow remnant
Abstract
"Green Bean" Galaxies (GBs) are the most [O III]-luminous type-2 active galactic nuclei (AGN) at z~0.3. However, their infrared luminosities reveal AGN in very low activity states, indicating that their gas reservoirs must be ionized by photons from a recent high activity episode - we are observing quasar ionization echoes. We use integral field spectroscopy from the Gemini Multi-Object Spectrograph to analyse the 3D kinematics, ionization state, temperature and density of ionized gas in the GB SDSS J224024.1-092748. We model the emission line spectrum of each spaxel as a superposition of up to three Gaussian components and analyse the physical properties of each component individually. Two narrow components, tracing the velocity fields of the disc and an ionized gas cloud, are superimposed over the majority of the galaxy. Fast shocks produce hot ( 20,000 K), dense (…
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