Are forbidden lines present in the optical spectrum of the QSO 3C 273?

Details Are forbidden lines present in the optical spectrum of the QSO 3C 273? Are forbidden lines present in the optical spectrum of the QSO 3C 273?

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..529p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 529-531.

Other

10

Astronomical Spectroscopy, Emission Spectra, Forbidden Bands, H Beta Line, Quasars, Visible Spectrum, Active Galaxies, Fine Structure, Frequency Shift, Oxygen Spectra, Spectral Line Width

Scientific paper

The emission lines in the vicinity of H-beta in the spectrum of 3C 273 are reexamined. It is found that while most of the emission redward of H-beta is attributable to strong multiplet 42 Fe II lines, forbidden O III lines double-lambda 4959, 5007 also appears to be present. The forbidden O III lines are broad compared to those in other active galaxies, but they are narrower than the permitted lines and presumably arise in a distinct region. The large forbidden line widths account for the unusual appearance of the 3C 273 spectrum.

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