THE REDSHIFT EVOLUTION OF THE LYMAN-ALPHA FOREST - BLENDING EFFECTS

被引：12

作者：

TREVESE, D ^{[1
]}

GIALLONGO, E ^{[1
]}

CAMURANI, L ^{[1
]}

机构：

[1] OSSERV ASTRON ROMA,I-00040 MONTE PORZIO CATO,ITALY

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 398卷 / 02期

关键词：

QUASARS; ABSORPTION LINES; TECHNIQUES; SPECTROSCOPIC;

D O I：

10.1086/171871

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The determination of the intrinsic properties and the evolution of the Lyman-alpha absorption lines in the spectra of high-redshift quasars can be severely affected by line blending in medium-dispersion spectroscopic data. We compare simulated spectra with real data showing how line blending can produce an apparent dependence of the number density evolutionary parameter gamma of the absorption lines on their equivalent widths, stronger lines evolving faster with redshift. An intrinsic dependence of gamma on W of the opposite sign, recently found at high resolution, appears consistent with medium-dispersion data. This type of evolution could partly account for the excess of absorption found at redshift greater than 4.

引用

页码：491 / 494

页数：4

共 10 条

[1] THE EFFECT OF CLUSTERING ON THE EQUIVALENT WIDTH DISTRIBUTION OF QSO LYMAN-ALPHA CLOUDS [J].