Astrophysical: Quasars

  • Publication
    Multiband optical variability on diverse timescales of the blazar Ton 599 from 2011 to 2023
    Context. We analyze the optical variability of the flat-spectrum radio quasar (FSRQ) Ton 599 using BVRI photometry from the Whole Earth Blazar Telescope (WEBT)...
  • Publication
    Multiepoch Multiwavelength Spectra and Models for Blazar 3C 279
    Of the blazars detected by EGRET in GeV γ-rays, 3C 279 is not only the best observed by EGRET but also one of the best monitored at lower frequencies. We have...
  • Publication
    Multifrequency Analysis of the New Wide-Separation Gravitational Lens Candidate RX J0921+4529
    We report the discovery of a new two-image gravitational lens candidate. The system RX J0921+4529 contains two zs=1.66 quasars separated by 6.93" with an H-band...
  • Publication
    Multifrequency spectral analysis of extragalactic radio sources in the 33-GHz VSA catalogue: sources with flattening and upturn spectrum
    We present an analysis of the spectral properties of the extragalactic radio sources in the nearly complete Very Small Array (VSA) sample at 33GHz. Data from...
  • Publication
    Multifrequency Studies of the Peculiar Quasar 4C +21.35 during the 2010 Flaring Activity
    The discovery of rapidly variable Very High Energy (VHE; E > 100 GeV) γ-ray emission from 4C +21.35 (PKS 1222+216) by MAGIC on 2010 June 17, triggered by the...
  • Publication
    Multiphase characterization of AGN winds in five local type-2 quasars
    We present MEGARA integral field unit (IFU) observations of five local type-2 quasars (QSO2s, z ∼ 0.1) from the Quasar Feedback (QSOFEED) sample. These active...
  • Talk
    Multiply-imaged Quasars: Doubles, Quads and Einstein Rings (1)
  • Talk
    Multiply-imaged Quasars: Time Delays and Hubble Constant (3)
  • Publication
    Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio
    We report the results of decade-long (2008-2018) γ-ray to 1 GHz radio monitoring of the blazar 3C 279, including GASP/WEBT, Fermi and Swift data, as well as...