Astrophysical: Quasars

  • Publication
    Photometric Variability of the Gravitational Lens 0142-100 (UM 673)
    We present the results of a photometric CCD monitoring of the gravitational lens system UM 673 that took place from 1995 to 2000. In total, the doubly imaged...
  • Publication
    Physical Parameters and Classification of Eight Galactic Nuclei from the Second Byurakan Survey
    Accurate estimates of spectral parameters are essential to investigate the physical conditions in active galactic nuclei (AGNs). In particular, intrinsic...
  • Talk
    Pieces to the puzzle of high-redshift galaxies
    Our Universe is filled with a mind-blowing diversity and different types and appearances of galaxies. Finding out about how they formed and evolved is one of...
  • Publication
    Planck early results. XV. Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources
    Spectral energy distributions (SEDs) and radio continuum spectra are presented for a northern sample of 104 extragalactic radio sources, based on the Planck...
  • Publication
    PMN J1838-3427: A New Gravitationally Lensed Quasar
    We report the discovery of a new double-image quasar that was found during a search for gravitational lenses in the southern sky. Radio source PMN J1838-3427 is...
  • Publication
    Polarimetric observations of a sample of Compact Steep-Spectrum sources
    Measurements of the polarised emission from Compact Steep-Spectrum (CSS) sources can give important information about the physical conditions inside and around...
  • Publication
    Polarization of changing-look quasars
    If the disappearance of the broad emission lines observed in changing-look quasars originates from the obscuration of the quasar core by dusty clouds moving in...
  • Publication
    Polarization of the changing-look quasar J1011+5442
    If the disappearance of the broad emission lines observed in changing-look quasars were caused by the obscuration of the quasar core through moving dust clouds...
  • Publication
    Primary Black Hole Spin in OJ 287 as Determined by the General Relativity Centenary Flare
    OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in a binary black hole model. The...