Hai Fu and Alan Stockton 2007 ApJ 664 L75 doi:10.1086/520959
A Common Origin for Quasar Extended Emission-Line Regions and Their Broad-Line Regions
FREE ISSUEHai Fu1 and Alan Stockton1,2
Show affiliationsWe present a correlation between the presence of luminous extended emission-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] λ5007 narrowband imaging and Hubble Space Telescope UV spectra of 12 quasars at 0.20 ≤ z ≤ 0.45. Quasars showing luminous EELRs have low-metallicity BLRs (Z 
0.6 Z
), while the remaining quasars show typical metal-rich gas (Z > Z). Previous studies have shown that EELRs themselves also have low metallicities (Z 0.5 Z). The correlation between the occurrence of EELRs and the metallicity of the BLRs, strengthened by the subsolar metallicity in both regions, indicates a common external origin for the gas, almost certainly from the merger of a gas-rich galaxy. Our results provide the first direct observational evidence that the gas from a merger can indeed be driven down to the immediate vicinity (<1 pc) of the central black hole.
- Subject headings
galaxies: abundances; galaxies: evolution; galaxies: ISM; quasars: emission lines
- Dates
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Issue 2 (2007 August 1)
Received 2007 May 23, accepted for publication 2007 June 19
Published 2007 July 18
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A Common Origin for Quasar Extended Emission-Line Regions and Their Broad-Line Regions
Hai Fu and Alan Stockton 2007 ApJ 664 L75
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