IUE observations of the quasar 3C 273

Details IUE observations of the quasar 3C 273 IUE observations of the quasar 3C 273

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l.131b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, June 15, 1979, p. L131-L136.

Astronomy and Astrophysics

Astronomy

36

Iue, Quasars, Red Shift, Satellite Observation, Spaceborne Astronomy, Ultraviolet Spectra, Absorption Spectra, Balmer Series, H Beta Line, Interstellar Extinction

Scientific paper

IUE observations indicate that the spectrum of 3C 273 is similar to that of other large-redshift quasars. There is a large excess of flux in the range 2400 A to 5300 A, which encompasses the Balmer jump region but which does not appear to be explainable by Balmer emission. The intensity ratio of Lyman-alpha to H-beta is 5.5, in agreement with other measures and a factor 6 smaller than the recombination value. The only absorption lines in the spectrum are due to our Galaxy. There is marginal evidence for a depression of the continuum shortward of the Lyman-alpha emission line, but the errors are too large to warrant any conclusion that 3C 273 has a rich absorption-line spectrum such as that seen in large-redshift quasars. The absence of emission and absorption lines of Fe II leads to the conclusion that resonance fluorescence probably produces the visual Fe II emission lines.

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