AR 14290 (Archival Research)

Mon Jul 15 04:59:12 GMT 2024

Principal Investigator: D. Crenshaw
PI Institution: Georgia State University Research Foundation
Investigators (xml)

Title: What is the Impact of Narrow-Line Region Outflows on AGN Feedback?
Cycle: 23

Mass outflows of ionized gas are often detected in the narrow-line regions (NLRs) of nearby AGN. These outflows are potentially very important for the growth and coevolution of supermassive black holes (SMBHs) and their host galaxy bulges, because they may provide significant feedback on the scales of nuclear star formation and bulge growth (hundreds of parsecs). To investigate this issue, we conducted a pilot study of the NLR in the Seyfert 1 galaxy NGC 4151 using existing HST observations, and were able to determine the mass outflow rate and kinetic luminosity as a function of position in the NLR of an AGN for the first time. We found that NLR outflows can indeed provide effective feedback in this AGN on scales where circumnuclear star formation and bulge growth occur. How general is this result, what are the ranges in feedback parameters in AGN, and what is their dependence on luminosity? We will address these questions with an HST archive study of 9 additional Seyfert galaxies, using STIS low-dispersion spectra, WFPC2 or WFC3 [O III] images, kinematic models, and photoionization models to determine mass outflow rates and kinetic luminosities as a function of position in their NLRs. These parameters will allow us to gauge the overall importance of NLR outflows as feedback mechanisms in moderate luminosity AGN, and provide a framework for understanding the mechanisms of feedback in other types of AGN, including more luminous quasars at higher redshifts.