Outflow and metallicity in the broad-line region of low-redshift active
  galactic nuclei
  Outflows in active galactic nuclei (AGNs) are crucial to understand in
investigating the co-evolution of supermassive black holes (SMBHs) and their
host galaxies since outflows may play an important role as an AGN feedback
mechanism. Based on the archival UV spectra obtained with HST and IUE, we
investigate outflows in the broad-line region (BLR) in low-redshift AGNs (z <
0.4) through the detailed analysis of the velocity profile of the CIV emission
line. We find a dependence of the outflow strength on the Eddington ratio and
the BLR metallicity in our low-redshift AGN sample, which is consistent with
the earlier results obtained for high-redshift quasars. These results suggest
that the BLR outflows, gas accretion onto SMBH, and past star-formation
activity in the host galaxies are physically related in low-redshift AGNs as in
powerful high-redshift quasars.
