SIMBAD references

2007ApJ...664L..75F - Astrophys. J., 664, L75-L78 (2007/August-1)

A common origin for quasar extended emission-line regions and their broad-line regions.

FU H. and STOCKTON A.

Abstract (from CDS):

We 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.

Abstract Copyright:

Journal keyword(s): Galaxies: Abundances - Galaxies: Evolution - Galaxies: ISM - Galaxies: Quasars: Emission Lines

Simbad objects: 13

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2021.04.13-05:27:31

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