A redshift difference between high and low ionization emission-line regions in QSO's-evidence for radial motions.
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