Weighing a galaxy bar in the lens Q2237+0305

被引：76
|
作者：
Schmidt, R
Webster, RL
Lewis, GF
机构：
[1] Univ Melbourne, Sch Phys, Parkville, Vic 3052, Australia
[2] SUNY Stony Brook, Stony Brook, NY 11794 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1998年 / 295卷 / 02期
关键词：
galaxies; fundamental parameters; individual; 2237; 0305; spiral; gravitational lensing;
D O I：
10.1046/j.1365-8711.1998.01326.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In the gravitational lens system Q2237 + 0305 the cruciform quasar image geometry is twisted by 10 degrees by the lens effect of a bar in the lensing galaxy. This effect can be used to measure the mass of the bar. We construct a new lensing model for this system with a power-law elliptical bulge and a Ferrers bar. The observed ellipticity of the optical isophotes of the galaxy leads to a nearly isothermal elliptical profile for the bulge, with a total quasar magnification of 16(-4)(+5). We measure a bar mass of (7.5 +/- 1.5) x 10(8) h(75)(-1) M. in the region inside the quasar images.
引用
收藏
页码：488 / 496
页数：9
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