Astrophysical: Quasars

  • Publication
    Discovery of a binary quasar at z = 1.76
    We present the serendipitous discovery of a physical pair of quasars with estimated cosmological redshift z = 1.76. Long-slit spectroscopic observations of the...
  • News
    Discovery of relativistic jets blowing bubbles in the central region of the Teacup Galaxy
    A study led by Anelise Audibert, a researcher at the Instituto de Astrofísica de Canarias (IAC), reveals a process that explains the peculiar morphology of the...
  • Publication
    Discovery of Very High Energy γ-Rays from 1ES 1011+496 at z = 0.212
    We report on the discovery of very high energy (VHE) γ-ray emission from the BL Lacertae object 1ES 1011+496. The observation was triggered by an optical...
  • Publication
    Do the Most Massive Black Holes at z = 2 Grow via Major Mergers?
    The most frequently proposed model for the origin of quasars holds that the high accretion rates seen in luminous active galactic nuclei (AGN) are primarily...
  • Publication
    Dramatic emission line variations in QSO KAZ 102 and possible causes
    We report optical spectroscopic observations of the radio-quiet quasar Kaz 102. We find impressive variations of the Hα emission line both in shape and...
  • Publication
    Dust Reverberation Mapping in Distant Quasars from Optical and Mid-infrared Imaging Surveys
    The size of the dust torus in active galactic nuclei (AGNs) and their high-luminosity counterparts, quasars, can be inferred from the time delay between UV...
  • Publication
    Eight more ultra luminous X-ray candidates unmasked
    Aims:We aim to identify the nature of several objects previously catalogued as ultra-luminous X-ray (ULX) source candidates. Methods: Long-slit spectroscopy of...
  • News
    Einstein’s Principle of Equivalence verified in quasars for the first time
    According to Einstein’s theory of general relativity gravity affects light as well as matter. One consequence of this theory, based on the Principle of...
  • Publication
    Electron densities from [S II] lines significantly overestimate the impact of ionized AGN outflows
    To explain the properties of the local galaxy population, theoretical models require active galactic nuclei (AGNs to inject energy into host galaxies, thereby...