Signatures of AGN feedback modes: A Green Bean Galaxy with 150 kpc jet-induced radio emission

TL;DR

This study presents a Green Bean galaxy with large-scale jet-induced radio emission, revealing insights into AGN feedback modes, jet activity, and galaxy evolution through multiwavelength observations and spectral analysis.

Contribution

It provides the first detailed analysis of a Green Bean galaxy with extended jet-induced radio emission, highlighting the galaxy's recent jet activity and its impact on surrounding clouds.

Findings

Extended radio lobes are over 6 million years old.

The galaxy's AGN ionizing photon production has declined significantly in 0.15 Myr.

Evidence suggests recent jet activity possibly preceding radiatively efficient accretion.

Abstract

Jetted Active Galactic Nuclei (AGN) hosting extended photoionized nebulae provide us with a unique view of the timescales associated with AGN activity. Here, we present a new Green Bean galaxy (RGB1) at $z=0.304458\pm0.000007$ with large scale jet-induced radio emission. The Spectral Energy Distributions (SEDs) of the radio components show steep spectral indices ($\alpha=-0.85$ to $-0.92$ for the extended regions, and $\alpha=-1.02$ for the faint radio core), and spectral age modeling of the extended radio emission indicates that the lobes are $>$6 Myrs old. It is unclear whether the jet is active, or remnant with an off-time of 2-3 Myr. Several detached clouds lie around the host galaxy up to 37.8 kpc away from the nucleus, and their ionization profile indicates a decline ($\sim$2 dex) in the AGN ionizing photon production over the past $\sim$0.15 Myr. Furthermore, we measure a blue shift for one of the clouds that is spatially coincident with the path of the radio jet. The cloud is likely illuminated by the photoionizing AGN, and potentially underwent an interaction with the relativistic jet. Our multiwavelength analysis suggests that RGB1 was in a phase of jet production prior to the radiatively efficient accretion phase traced by the detached cloud emission. It is unclear whether RGB1 transitioned into a low-excitation radio galaxy or an inactive galaxy over the past $\sim$0.15 Myr, or whether the extended radio and optical emission trace distinct accretion phases that occurred in succession.