Kavli Affiliate: Luis C. Ho
| First 5 Authors: Zhicheng He, Zhifu Chen, Guilin Liu, Tinggui Wang, Luis C. Ho
| Summary:
Galactic-wide outflows driven by active galactic nuclei (AGNs) is a routinely
invoked feedback mechanism in galaxy evolution models. Hitherto, the interplay
among the interstellar gas on galactic scales, the propagation of AGN outflows
and the fundamental AGN parameters during evolution remains elusive. Powerful
nuclear outflows are found to favorably exist at early AGN stages usually
associated with high accretion rates and weak narrow emission lines. In a
sample of quasars emitting Mg II narrow absorption lines (NALs) from the Sloan
Digital Sky Survey, we discover an unprecedented phenomenon where galaxy-scale
inflow-dominated transforming into outflow-dominated gas accompanied by an
increasing strength of the narrow [O III] line, at a confidence level of
6.7{sigma}. The fact that nuclear outflows diminish while galaxy-wide outflows
intensifies as AGNs evolve implies that early-stage outflows interact with
interstellar medium on galactic scales and trigger the gradual transformation
into galaxy-wide outflows, providing observational links to the hypothetical
multi-stage propagation of AGN outflows that globally regulates galaxy
evolution.
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