Weighing a galaxy bar in the lens Q2237+=0305
Weighing a galaxy bar in the lens Q2237+=0305
复制标题
称量镜头中的银河条 Q2237 =0305
DOI：
10.1046/j.1365-8711.1998.01326.x
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发表时间：
1997
影响因子：
4.8
通讯作者：
G. Lewis
中科院分区：
文献类型：
--
作者：
R. Schmidt;R. Webster;G. Lewis
在引力透镜系统Q2237+0305中，十字形类星体在透镜星系中的透镜效应使其像几何扭曲了10摄氏度。这种效应可以用来测量棒子的质量。我们为该系统构造了一个新的透镜模型，该模型具有一个幂函数椭圆球和一个费勒斯棒。观测到的星系光学等光线的椭圆度导致了膨胀的近似等温椭圆轮廓，总类星体放大倍数为16+5−4。我们在类星体图像内部区域测量了(7.5？1.5)-108h−175M⊙的棒质量。
In the gravitational lens system Q2237+0305 the cruciform quasar image geometry is twisted by 10c 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+5−4. We measure a bar mass of (7.5 ? 1.5)-108h−175 M⊙ in the region inside the quasar images.