Comparisons of the emission-line properties of radio-loud and radio-quiet QSOs at high redshift

Details Comparisons of the emission-line properties of radio-loud and radio-quiet QSOs at high redshift Comparisons of the emission-line properties of radio-loud and radio-quiet QSOs at high redshift

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..577c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. 577-588.

Astronomy and Astrophysics

Astrophysics

27

Emission Spectra, Luminosity, Quasars, Radiant Flux Density, Red Shift, Asymmetry, Wavelengths

Scientific paper

The emission-line properties of two sets of samples of high-redshift radio-loud and radio-quiet QSOs that are well matched in optical luminosity are compared. No strong differences are found between any of the fundamental parameters of the strong ultraviolet lines, in agreement with the basic result of Steidel and Sargent. Additionally, no evidence is found for a difference in the strength of the 'Fe II bump' at 2500 A between the samples, in contrast to the differences known to exist in the strengths of optical Fe II emission features. Comparison of the radio and optical luminosities among the radio-loud objects also reveals no strong correlation. The results of the comparisons between the radio-loud and radio-quiet samples suggest that the broad-line regions of both classes are fundamentally similar, and are largely unaffected by the production or collimation of the radio-emitting plasma. Analysis of the asymmetry of the C IV 1549-A profile among the radio-loud objects reveals that the degree of this asymmetry appears to be correlated with the luminosity of the underlying continuum, such that the most luminous objects have the most strongly asymmetric profiles. The implications of this result are briefly discussed.

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