  In this manuscript, we report strong linear correlation between shifted
velocity and line width of the broad blue-shifted [OIII] components in SDSS
quasars. Broad blue-shifted [OIII] components are commonly treated as
indicators of outflows related to central engine, however, it is still an open
question whether the outflows are related to central accretion properties or
related to local physical properties of NLRs (narrow emission line regions).
Here, the reported strong linear correlation with the Spearman Rank correlation
coefficient 0.75 can be expected under the assumption of AGN (active galactic
nuclei) feedback driven outflows, through a large sample of 535 SDSS quasars
with reliable blue-shifted broad [OIII] components. Moreover, there are much
different detection rates for broad blue-shifted and broad red-shifted [OIII]
components in quasars, and no positive correlation can be found between shifted
velocity and line width of the broad red-shifted [OIII] components, which
provide further and strong evidence to reject possibility of local outflows in
NLRs leading to the broad blue-shifted [OIII] components in quasars. Thus, the
strong linear correlation can be treated as strong evidence for the broad
blue-shifted [OIII] components as better indicators of outflows related to
central engine in AGN. Furthermore, rather than central BH masses, Eddington
ratios and continuum luminosities have key roles on properties of the broad
blue-shifted [OIII] components in quasars.
