Mass and dust in the disk of a spiral lens galaxy

Joshua N. Winn, Patrick B. Hall, Paul L. Schechter

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


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 flat rotation curve, does not change this conclusion.

Original languageEnglish (US)
Pages (from-to)672-679
Number of pages8
JournalAstrophysical Journal
Issue number2 I
StatePublished - Nov 10 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Dark matter
  • Dust, extinction
  • Galaxies: spiral, structure, halos
  • Gravitational lensing
  • Quasars: individual (PMN J2004-1349)


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