Spectral differences between radio galaxies and quasars

Details Spectral differences between radio galaxies and quasars Spectral differences between radio galaxies and quasars

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.343...43j&link_type=abstract

Nature (ISSN 0028-0836), vol. 343, Jan. 4, 1990, p. 43-45.

Other

70

Astronomical Spectroscopy, Quasars, Radio Galaxies, Spectrum Analysis, Forbidden Transitions, H Alpha Line, H Beta Line, Line Spectra, Luminosity

Scientific paper

If narrow-line radio galaxies and quasars are intrinsically similar, the forbidden O III 5007 A line luminosities of the two types of object should be similar for a given extended radio luminosity and redshift. It is found that this is not the case for spectroscopic observations of a sample of radio galaxies and quasars selected so as to be otherwise comparable. The quasar forbidden O III luminosities exceed those of radio galaxies by factors of 5-10. Extinction by at least two magnitudes as a result of orientation differences is necessary for these observations to remain consistent with the radio galaxy/quasar unification hypothesis. It is suggested that evidence for such extinction may exist in the form of high H-alpha/H-beta ratios in radio galaxies.

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