Astrophysical: Quasars

  • Publication
    The Nature and Size of the Optical Continuum Source in QSO 2237+0305
    From the peak of a gravitational microlensing high-magnification event in the A component of QSO 2237+0305, which was accurately monitored by the Gravitational...
  • Publication
    The Nature of Ultraluminous X-Ray Sources
    We present spectroscopic observations of six optical counterparts of ultraluminous X-ray sources (ULXs) around nearby galaxies. The spectra of the six objects...
  • Publication
    The near-IR properties and continuum shapes of high redshift quasars from the Sloan Digital Sky Survey
    We present J-H-K' photometry for a sample of 45 high redshift quasars found by the Sloan Digital Sky Survey. The sample was originally selected on the basis of...
  • Publication
    The optical and UV spectrum of the Seyfert type 2 galaxy NGC 3393
    The combined UV and optical spectrum of the Seyfert type 2 galaxy NGC 3393 is presented and analyzed together with published IR and IRAS data. The conditions in...
  • Publication
    The optical variability of 3C 345
    The behavior of the light curve of 3C 345 is analyzed using all B magnitudes available in the literature, thus extending the number of points in the compiled...
  • Publication
    The optical variability of 3C 345
    B-magnitudes have been compiled from the literature for 3C 345, covering a period from 1965 to 1980, 905 values in all. Since the last major study of the light...
  • Publication
    The optical variability of 3C 345.
    The publication by Lloyd (1984) of new and revised data for a sample of active nuclei brought the number of published observations of 3C 345 up to over 900...
  • Publication
    The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue
    Context. The evolution of galaxies through cosmic time is studied observationally by means of extragalactic surveys. The usefulness of these surveys is greatly...
  • Publication
    The Peculiar Optical Spectrum of 4C+22.25: Imprint of a Massive Black Hole Binary?
    We report the discovery of peculiar features in the optical spectrum of 4C+22.25, a flat spectrum radio quasar at z = 0.4183 observed in the Sloan Digital Sky...