AN ESTIMATE OF THE HUBBLE CONSTANT FROM THE GRAVITATIONAL LENSING OF QUASAR Q0957+561

被引：55

作者：

RHEE, G ^{[1
]}

机构：

[1] STERREWACHT LEIDEN,2300 RA LEIDEN,NETHERLANDS

来源：

NATURE | 1991年 / 350卷 / 6315期

关键词：

D O I：

10.1038/350211a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The double quasar Q0957 + 561 AB is believed to be a gravitationally lensed image formed by a galaxy at redshift z = 0.36: a single quasar at z = 1.41 is seen as two images because of the intervening galaxy. I present here a measurement of the velocity dispersion of the intervening galaxy which, combined with a measurement of the time delay between the appearance of brightness variations in the two images, can be applied to a simple model of the lensing geometry to yield an estimate for the Hubble constant H0. The flux from the A and B images has been monitored for several years by two groups and a consistent value of 415 days for the time delay between variations in A and B has been obtained. The measured line-of-sight velocity dispersion for the intervening galaxy of 303 +/- 50 km s-1 then gives H0 = 50 +/- 17 km s-1 Mpc-1.

引用

页码：211 / 212

页数：2

共 14 条

[1]

DANESE L, 1980, ASTRON ASTROPHYS, V82, P322

[2]

FALCO E, IN PRESS ASTROPHYS J

[3] ON MODEL-DEPENDENT BOUNDS ON H0 FROM GRAVITATIONAL IMAGES - APPLICATION TO Q0957+561A,B [J].