Browsing by Subject "gravitational lensing"

Now showing items 1-4 of 4

    • A close separation double quasar lensed by a gas-rich galaxy 
      Gregg, Michael D.; Wisotzki, Lutz; Becker, Robert H.; Maza Sancho, José; Schechter, Paul L.; White, Richard L.; Brotherton, Michael S.; Winn, Joshua N. (The American Astronomical Society, 2000-06)
      In the course of a Cycle 8 snapshot imaging survey with the Space Telescope Imaging Spectrograph (STIS), we have discovered that the z\1.565 quasar HE 0512[3329 is a double with image separation 0A.644, di ering in ...
    • CTQ 327: A new gravitational lens 
      Morgan, N. D.; Gregg, M. E.; Wisotzki, L.; Becker, R.; Maza Sancho, José; Schechter, P. L.; White, R. L. (2003-08)
      We present the second gravitationally lensed quasar discovered during the course of a Hubble Space Telescope Space Telescope Imaging Spectrograph snapshot survey for small-separation gravitational lenses. CTQ 327 is a ...
    • CTQ 414: a new gravitational lens 
      Morgan, Nicholas D.; Dressler, Alan; Maza Sancho, José; Schechter, Paul L.; Winn, Joshua N. (1999-10)
      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 ...
    • CTQ 839: Candidate for the smallest projected separation binary quasar 
      Morgan, Nicholas D.; Burley, Greg; Costa Hechenleitner, Edgardo; Maza Sancho, José; Persson, S. E.; Ruiz González, María Teresa; Schechter, Paul L.; Thompson, Ian; Winn, Joshua N. (2000-03)
      We report the discovery of the new double quasar CTQ 839. This B\18.3, radio-quiet quasar pair is separated by 2A.1 in BRI and H Ðlters, with magnitude di erences of *mB\2.5, *mR\*mI\1.9, and *mH\2.3. Spectral observations ...