1999/06/09 by N. D. Morgan, Nicholas D. Morgan, Alan Dressler +4 · 3 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitational lens #Lens (geology) #Magnitude (astronomy) #Optics #Physics #Quasar #Redshift #Stellar, planetary, and galactic studies #Strong gravitational lensing #astro-ph
paper · pdf · doi:10.1086/301056
Latex, 18 pages including 2 ps figures; accepted for publication in AJ
arxiv created 1999/06/09 · openalex publication_date 1999/10/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.