Journal
ASTROPHYSICAL JOURNAL
Volume 597, Issue 2, Pages 672-679Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/378637
Keywords
dark matter; dust, extinction; galaxies : spiral, structure, halos gravitational lensing; quasars : individual (PMN J2004-1349)
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Gravitational lensing is a potentially important probe of spiral galaxy structure, but only a few cases of lensing by spiral galaxies are known. We present Hubble Space Telescope and Magellan observations of the two-image quasar PMN J2004-1349, revealing that the lens galaxy is a spiral galaxy. One of the quasar images passes through a spiral arm of the galaxy and suffers 3 mag of V-band extinction. Using simple lens models, we show that the mass quadrupole is well aligned with the observed galaxy disk. A more detailed model with components representing the bulge and disk gives a bulge-to-disk mass ratio of 0.16+/-0.05. The addition of a spherical dark halo, tailored to produce an overall. at rotation curve, does not change this conclusion.
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