Astrofísicas: Cuásares

  • Publicación
    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...
  • Publicación
    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...
  • Publicación
    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...
  • Publicación
    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...
  • Publicación
    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...
  • Publicación
    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...
  • Noticia
    El telescopio LST-1 en La Palma descubre el cuásar más lejano en muy altas energías
    El primer prototipo de Large-Sized Telescope (LST) del Cherenkov Telescope Array Observatory (CTAO ), ubicado en el Observatorio del Roque de los Muchachos...
  • Publicación
    Electron-beam interaction with emission-line clouds in blazars
    Context. An electron-positron beam escaping from the magnetospheric vacuum gap of an accreting black hole interacts with recombination-line photons from...
  • Publicación
    Environments of nearby quasars in Sloan Digital Sky Survey
    Context: For the first time, spectroscopic galaxy redshift surveys are enabling galaxies to be studied with the nearest quasars. This allows the dependence of...