A nearly symmetric double-image gravitational lens

Joshua N. Winn, Jacqueline N. Hewitt, Alok R. Patnaik, Paul L. Schechter, Robert A. Schommer, Sebastian López, José Maza, Stefanie Wachter

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We report the discovery of a new double-image gravitational lens, resulting from our search for lenses in the southern sky. Radio source PMN J2004-1349 is composed of two compact components separated by 1′.13 in VLA, MERLIN, and VLBA images. The components have a flux ratio of 1:1 at radio frequencies ranging from 5 to 22.5 GHz. The I-band optical counterpart is also an equal double, with roughly the same separation and position angle as the radio double. Upon subtraction of the components from the I-band image, we identify a dim pattern of residuals as the lens galaxy. While the present observations are sufficient to establish that PMN J2004-1349 is a gravitational lens, additional information will be necessary (such as the redshifts of the galaxy and quasar and precise astrometry and photometry of the lens galaxy) before constructing detailed mass models.

Original languageEnglish (US)
Pages (from-to)1223-1231
Number of pages9
JournalAstronomical Journal
Issue number3
StatePublished - Mar 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Distance scale
  • Gravitational lensing
  • Quasars: individual (PMN J2004-1349)


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