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We present a correlation between the presence of luminous extendedemission-line regions (EELRs) and the metallicity of the broad-line regions(BLRs) of low-redshift quasars. The result is based on ground-based [O III]5007 narrow-band imaging and Hubble Space Telescope UV spectra of 12 quasars at0.20 < z < 0.45. Quasars showing luminous EELRs have low-metallicity BLRs (Z <0.6 Z_Solar), while the remaining quasars show typical metal-rich gas (Z >Z_Solar). Previous studies have shown that EELRs themselves also have lowmetallicities (Z < 0.5 Z_Solar). The correlation between the occurrence ofEELRs and the metallicity of the BLRs, strengthened by the sub-Solarmetallicity in both regions, indicates a common external origin for the gas,almost certainly from the merger of a gas-rich galaxy. Our results provide thefirst direct observational evidence that the gas from a merger can indeed bedriven down to the immediate vicinity (< 1 pc) of the central black hole.

A Common Origin for Quasar Extended Emission-Line Regions and Their Broad-Line Regions