other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
1999ApJ...515..487T - Astrophys. J., 515, 487-496 (1999/April-3)
Lack of iron abundance evolution in high-redshift QSOs.
THOMPSON K.L., HILL G.J. and ELSTON R.
Abstract (from CDS):
We also discuss alternate explanations. The abundance evolution in the central regions of galaxies that host QSOs may follow a significantly different path to that in the solar neighborhood, perhaps from the dominance of short-lived type Ia supernovae progenitors or through the lack of any significant type Ia contribution, in which case we are yet underestimating the efficiency of Fe+ ions in QSO broad-line clouds for production of the observed Fe II. Cosmologies with terms beyond zero-pressure matter are also briefly discussed. These considerations notwithstanding, the lack of observed Fe II evolution at high redshifts puts unique constraints on luminous QSO broad-line physics, nucleosynthesis in the QSO host galaxies, and/or cosmological parameters.
Abstract Copyright: ∼
Journal keyword(s): Cosmology: Observations - Cosmology: Early Universe - Galaxies: Evolution - Galaxies: Quasars: Emission Lines - Galaxies: Quasars: General
CDS comments: Table 1: 0248+1802 = QSO J0248+1802
Simbad objects: 13
To bookmark this query, right click on this link: simbad:1999ApJ...515..487T and select 'bookmark this link' or equivalent in the popup menu