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arXiv:0706.2941 (astro-ph)
[Submitted on 20 Jun 2007]

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

Authors:Hai Fu, Alan Stockton (IfA Hawaii)
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Abstract: 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] 5007 narrow-band 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_Solar), while the remaining quasars show typical metal-rich gas (Z > Z_Solar). Previous studies have shown that EELRs themselves also have low metallicities (Z < 0.5 Z_Solar). The correlation between the occurrence of EELRs and the metallicity of the BLRs, strengthened by the sub-Solar 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.
Comments: Accepted for publication in ApJ Letters. 4 pages, 1 figure, 1 table
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.2941 [astro-ph]
  (or arXiv:0706.2941v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.2941
Journal reference: Astrophys.J. 664L (2007) 75-78
Related DOI: https://doi.org/10.1086/520959

Submission history

From: Hai Fu [view email]
[v1] Wed, 20 Jun 2007 09:28:56 UTC (19 KB)
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