Astrophysical: Quasars

  • Publication
    Large-scale environments of z < 0.4 active galaxies
    Context. Properties of galaxies depend on their large-scale environment. As the influence of active galactic nuclei (AGN) in galaxy evolution is becoming more...
  • Publication
    Long-term multiwavelength monitoring and reverberation mapping of NGC 2617 during a changing-look event
    We present the results of photometric and spectroscopic monitoring campaigns of the changing look AGN NGC 2617 carried out from 2016 until 2022 and covering the...
  • Publication
    Long-term optical spectral monitoring of a changing-look active galactic nucleus NGC 3516. II. Broad-line profile variability
    Context. We analyze the broad Hβ line profile variability of a "changing look" active galactic nucleus (CL-AGN) NGC 3516 over an extensive period of 25 years...
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    Long-term variability of quasi-stellar objects, and their distribution in the Hubble diagram.
    Not Available
  • Publication
    Low deuterium abundance in the z_abs=3.514 absorber towards APM 08279+5255
    {A high-resolution, high signal-to-noise HIRES-Keck spectrum of APM 08279+5255 reveals a feature in the HI Lyalpha profile of the z_abs=3.514 absorber at the...
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    Low-redshift quasars in the SDSS Stripe 82 - II. Associated companion galaxies and signature of star formation
    We present optical spectroscopy of the close companions of 22 low-redshift (z < 0.5) quasars (QSO) selected from a larger sample of QSO in the SDSS Stripe82...
  • Publication
    Low-resolution spectroscopy and spectral energy distributions of selected sources towards σ Orionis
    Aims: We study in detail nine sources in the direction of the young σ Orionis cluster, which is considered to be a unique site for studying stellar and...
  • News
    LST-1 telescope on La Palma detects the most distant quasar at very high energies
    The first Large-Sized Telescope (LST) prototype of the Cherenkov Telescope Array Observatory (CTAO), located at the Roque de los Muchachos Observatory (Garafía...
  • Publication
    Luminosity functions for galaxies and quasars in the Spitzer Wide-area Infrared Extragalactic Legacy Survey
    We construct rest-frame luminosity functions (LFs) at 3.6, 4.5, 5.8, 8 and 24 μm over the redshift range 0 z 2 for galaxies and 0 z 4 for optical quasi...