Journal Article

Weighing a galaxy bar in the lens Q2237 + 0305

Robert Schmidt, Rachel L. Webster and Geraint F. Lewis

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 295, issue 2, pages 488-496
Published in print April 1998 | ISSN: 0035-8711
Published online April 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01326.x
Weighing a galaxy bar in the lens Q2237 + 0305

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Abstract

In the gravitational lens system Q2237+0305 the cruciform quasar image geometry is twisted by 10° 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.

Keywords: galaxies: fundamental parameters; galaxies: individual: 2237+0305; galaxies: spiral; gravitational lensing

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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