CTQ 414: A new gravitational lens

Nicholas D. Morgan, Alan Dressler, José Maza, Paul L. Schechter, Joshua N. Winn

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We report the discovery and ground-based observations of the new gravitational lens CTQ 414. The source quasar lies at a redshift of z = 1.29 with a B magnitude of 17.6. Ground-based optical imaging reveals two point sources separated by 1″.2 with a magnitude difference of roughly 1 mag. Subtraction of two stellar point-spread functions from images obtained in subarcsecond seeing consistently leaves behind a faint, residual object. Fits for two point sources plus an extended object places the fainter object collinear with the two brighter components. Subsequent Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (NICMOS) observations have confirmed the identification of the fainter object as the lensing galaxy. Very Large Array observations at 8.46 GHz reveal that all components of the lensing system are radio-quiet down to the 0.2 mJy flux level.

Original languageEnglish (US)
Pages (from-to)1444-1449
Number of pages6
JournalAstronomical Journal
Issue number4
StatePublished - Oct 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Gravitational lensing
  • Quasars: individual (CTQ 414)


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