Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85l..11b&link_type=abstract
Astronomy and Astrophysics, vol. 85, no. 3, May 1980, p. L11-L14.
Astronomy and Astrophysics
Astrophysics
38
Astronomical Spectroscopy, Emission Spectra, Iron, Quasars, Bl Lacertae Objects, Line Spectra, Spectral Line Width, Spectrophotometry
Scientific paper
A search for Fe II emission in a sample of radio-quiet quasars has revealed the outstanding properties of PHL 1092. Intense Fe II lines dominate the entire spectrum, and the Fe II UV multiplets are nearly as strong as the optical ones. In contrast, the extreme weakness of the Balmer and Mg II lines is striking. For the first time Fe I lines are identified in an extragalactic object. The lines are narrow, with a FWHM of 1300-km/s. The presence of FE II UV lines and Fe I lines from the ground state requires moderate column densities. However Fe(0) can exist only in a region completely shielded from the UV continuum. The weakness of Mg II and H-beta relative to Fe II lines is best explained by their thermalization. The emitting region has an electronic density of 10 to the 12th per cu cm, a temperature of 10000 K, and has an optical depth in the Fe II UV lines of 1000-10000. It is speculated that for higher densities all the lines would be thermalized and the object could be a radio-quiet BL Lac object.
Bergeron Jacqueline
Kunth Daniel
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