Astrofísicas: Cuásares

  • Publicación
    The Extended High A(V) Quasar Survey: Searching for Dusty Absorbers toward Mid-infrared-selected Quasars
    We present the results of a new spectroscopic survey for dusty intervening absorption systems, particularly damped Lyα absorbers (DLAs), toward reddened quasars...
  • Publicación
    The extent of the Mg II absorbing circumgalactic medium of quasars
    We investigate the extent and the properties of the Mg II cool, low-density absorbing gas located in the halo and in the circumgalactic environment of quasars...
  • Publicación
    The filling factor of intergalactic metals at redshift z= 3
    Observations of quasar absorption-line systems reveal that the z= 3 intergalactic medium (IGM) is polluted by heavy elements down to H I optical depths τH I≪ 10...
  • Publicación
    The First Billion Years project: birthplaces of direct collapse black holes
    We investigate the environment in which direct-collapse black holes may form by analysing a cosmological, hydrodynamical simulation that is part of the First...
  • Publicación
    The First Precise Determination of an Optical-Far-Ultraviolet Extinction Curve Beyond the Local Group (z=0.83)
    We present the optical-far-ultraviolet extinction curve of the dust in the lens galaxy of the gravitational lens system SBS 0909+532 (z=0.83). Extending our...
  • Publicación
    The forbidden high-ionization-line region of the type 2 quasar SDSS J11311.05+162739.5: a clear view of the inner face of the torus?
    We present spectroscopic observations of the type 2 quasar SDSS J11311.05+162739.5 (z= 0.1732), which has the richest spectrum of forbidden high-ionization...
  • Publicación
    The FR II Broad-Line Seyfert 1 Galaxy: PKS J1037-2705
    In this article we demonstrate that PKS J1037-2705 has a weak accretion flow luminosity, well below the Seyfert 1/QSO dividing line, weak broad emission lines...
  • Publicación
    The galaxy counterpart and environment of the dusty damped Lyman-α absorber at z = 2.226 towards Q 1218+0832
    We report on further observations of the field of the quasar Q 1218+0832. Geier et al. (2019, A&A, 625, L9) presented the discovery of the quasar resulting from...
  • Publicación
    The High AV Quasar Survey: A z = 2.027 metal-rich damped Lyman-α absorber towards a red quasar at z = 3.21
    It is important to understand the selection effects behind the quasar samples to fully exploit the potential of quasars as probes of cosmic chemical evolution...