A redshift difference between high and low ionization emission-line regions in QSOs - Evidence for radial motions

Abstract

view Abstract Citations (424) References (51) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A redshift difference between high and low ionization emission-line regions in QSO's-evidence for radial motions. Gaskell, C. M. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1982 DOI: 10.1086/160481 Bibcode: 1982ApJ...263...79G Keywords: 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; Astrophysics full text sources ADS | data products NED (33) SIMBAD (30)