Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263...79g&link_type=abstract
Astrophysical Journal, Part 1, vol. 263, Dec. 1, 1982, p. 79-86.
Astronomy and Astrophysics
Astrophysics
281
Emission Spectra, Quasars, Radio Galaxies, Red Shift, Seyfert Galaxies, Spectral Line Width, Absorption Spectra, Accretion Disks, Astronomical Models, Cosmic Dust, Gas Ionization, Radial Velocity, Spectrophotometry
Scientific paper
The discovery of a systematic difference between the redshifts of the emission lines arising from the different ionization zones of broad-line quasar clouds is reported. The C IV, N V, C III], [Fe X], [Fe X], and possibly Lyman-α lines are at a lower redshift than the 0 1, Mg II, and Balmer lines. Comparison with the redshifts of the narrow emission lines shows that it is the high-ionization broad emission lines that are systematically blueshifted by 600 km s-1. This blueshift together with the high degree of symmetry of the high-ionization lines strongly constrains models of the broad emission line region. The blueshifting of the strongest emission lines readily observable in high-redshift quasars will affect the number of absorption-line systems which appear to have Zabs ≥ Zem.
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