Lensing effects on the protogalaxy candidate cB58 and their implications for the cosmological constant

被引：12

作者：

Hamana, T

Hattori, M

Ebeling, H

Henry, JP

Futamase, T

Shioya, Y

机构：

[1] UNIV HAWAII,INST ASTRON,HONOLULU,HI 96822

[2] MAX PLANCK INST EXTRATERR PHYS,D-8574 GARCHING,GERMANY

[3] TOHOKU UNIV,INTERDISCIPLINARY RES CTR,SENDAI,MIYAGI 98077,JAPAN

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 484卷 / 02期

关键词：

distance scale; galaxies; clusters; individual; (MS; 1512.4; 3647); gravitational lensing; X-rays;

D O I：

10.1086/304378

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The amplification of the protogalaxy candidate cB58 due to gravitational lensing by the foreground cluster of galaxies MS 1512.4+3647 is quantified based on recent ROSAT and ASCA X-ray observations. It is found that the amplification is at most 25 for any reasonable cosmological model with or without cosmological constant. It is also argued that the system may be used to place new constraints on the value of the cosmological constant. The gas mass fraction for this cluster is found to be about 0.2.

引用

页码：574 / 580

页数：7

共 21 条

[1] A combined X-ray and gravitational lensing study of the massive cooling-flow cluster PKS 0745-191 [J].