2016/06/27 by Dominika Wylezalek, Nadia L. Zakamska · 63 citations
Physics and Astronomy · #Active galactic nucleus #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #Galaxy #Luminosity #Outflow #Physics #Quasar #Star formation #Stellar mass #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1093/mnras/stw1557
published in Monthly Notices of the Royal Astronomical Society 461(4), 3724-3739 (Oxford University Press) · 18 pages, 10 figures, accepted to MNRAS
arxiv created 2016/06/27 · openalex publication_date 2016/06/29 · openalex created_date 2016/07/22 · arxiv updated 2016/08/03 · openalex updated_date 2026/08/05
Feedback from active galactic nuclei (AGN) is widely considered to be the main driver in regulating the growth of massive galaxies through heating or driving gas out of the galaxy, preventing further increase in stellar mass. Observational proof for this scenario has, however, been scarce. We have assembled a sample of 132 radio-quiet type-2 and red AGN at 0.1 < z < 1. We measure the kinematics of the AGN-ionized gas, the host galaxies’ stellar masses and star formation rates (SFRs) and investigate the relationships between AGN luminosities, specific star formation rates (sSFRs) and outflow strengths W90 – the 90 per cent velocity width of the [O iii]λ5007Å line power and a proxy for the AGN-driven outflow speed. Outflow strength is independent of sSFR for AGN selected on their mid-IR luminosity, in agreement with previous work demonstrating that star formation is not sufficient to produce the observed ionized gas outflows which have to be powered by AGN activity. More importantly, we find a negative correlation between W90 and sSFR in the AGN hosts with the highest SFRs, i.e. with the highest gas content, where presumably the coupling of the AGN-driven wind to the gas is strongest. This implies that AGN with strong outflow signatures are hosted in galaxies that are more ‘quenched’ than galaxies with weaker outflow signatures. Despite the galaxies’ high SFRs, we demonstrate that the outflows are not star formation driven but indeed due to AGN powering. This observation is consistent with the AGN having a net suppression, ‘negative’ impact, through feedback on the galaxies’ star formation history.