Weighing a galaxy bar in the lens Q2237+0305

Details Weighing a galaxy bar in the lens Q2237+0305 Weighing a galaxy bar in the lens Q2237+0305

1997-08-19

arxiv.org/abs/astro-ph/9708170v1

MNRAS 295 (1998) 488

Astronomy and Astrophysics

Astrophysics

9 pages, 5 Postscript figures, uses mn.sty and eps.sty, submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01326.x

In the gravitational lens system Q2237+0305 the cruciform quasar image geometry is twisted by ten 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^{+5}_{-4}. We measure a bar mass of 7.5\pm1.5 \times 10^8 h^{-1}_{75} M_{\sun} in the region inside the quasar images.

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