Hubble Space Telescope Observations of Extended [O III] {\lambda}5007 Emission in Nearby QSO2s: New Constraints On AGN / Host Galaxy Interaction

TL;DR

This study uses Hubble Space Telescope observations to analyze the extent and kinematics of ionized gas in nearby luminous Type 2 quasars, revealing outflow characteristics and implications for AGN-host galaxy interactions.

Contribution

It provides new measurements of the size and kinematics of AGN-ionized gas in QSO2s, highlighting the limited impact of AGN outflows on clearing host galaxy material.

Findings

[O III] regions scale with luminosity compared to Seyferts.

Average outflow radius is about 600 pc, influencing gas up to 1130 pc.

Compact [O III] morphologies correlate with broader nuclear emission lines.

Abstract

We present a Hubble Space Telescope (HST) survey of extended [O III] {\lambda}5007 emission for a sample of 12 nearby (z < 0.12), luminous Type 2 quasars (QSO2s), which we use to measure the extent and kinematics of their AGN-ionized gas. We find the size of the observed [O III] regions scale with luminosity in comparison to nearby, less luminous Seyfert galaxies and radially outflowing kinematics to exist in all targets. We report an average maximum outflow radius of $\sim$600 pc, with gas continuing to be kinematically influenced by the central AGN out to an average radius of $\sim$1130 pc. These findings question the effectiveness of AGN being capable of clearing material from their host bulge in the nearby universe and suggest that disruption of gas by AGN activity may prevent star formation without requiring evacuation. Additionally, we find a dichotomy in our targets when comparing [O III] radial extent and nuclear FWHM, where QSO2s with compact [O III] morphologies typically possess broader nuclear emission-lines.