Forbidden high-ionization lines in QSO spectra

Details Forbidden high-ionization lines in QSO spectra Forbidden high-ionization lines in QSO spectra

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250...57a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 57-61.

Astronomy and Astrophysics

Astrophysics

17

Active Galactic Nuclei, Forbidden Transitions, Line Spectra, Quasars, Emission Spectra, Photoionization

Scientific paper

(Fe VII) or (Ne V) lines in a sample of QSOs with different luminosities are observed. Compared to the lower-luminosity Seyfert nuclei the high-ionization forbidden lines were found to be enhanced relative to the lower-ionization forbidden lines, but of similar strengths relative to the nuclear continuum emission. As in lower-luminosity active galactic nuclei (AGN), the forbidden high-ionization lines tend to be blueshifted relative to and broader than the low-ionization 'narrow-line region' (NLR) features. The widths of the forbidden high-ionization lines of AGN appear correlated with the widths of the permitted 'broad-line region' (BLR) components. The observations are consistent with the assumption that the forbidden high-ionization lines result from photoionized gas located between the NLR and the BLR.

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