Astrophysical: Quasars

  • Publication
    Constraining the Epoch of Reionization from the Observed Properties of the High-z Universe
    We combine observational data on a dozen independent cosmic properties at high-z with the information on reionization drawn from the spectra of distant luminous...
  • Publication
    Constraining the nature of high frequency peakers. II. Polarization properties
    Aims:The “bright” High Frequency Peakers (HFPs) sample is a mixture of blazars and intrinsically small and young radio sources. We investigate the polarimetric...
  • Publication
    Constraint on the time variation of the fine-structure constant with the SDSS-III/BOSS DR12 quasar sample
    From the Sloan Digital Sky Survey (SDSS) Data Release 12, which covers the full Baryonic Oscillation Spectroscopic Survey (BOSS) footprint, we investigate the...
  • Publication
    Cross-correlation of SDSS DR7 Quasars and DR10 BOSS Galaxies: The Weak Luminosity Dependence of Quasar Clustering at z ~ 0.5
    We present the measurement of the two-point cross-correlation function (CCF) of 8198 Sloan Digital Sky Survey Data Release 7 quasars and 349,608 Data Release 10...
  • Publication
    Dark Matter Mass Fraction in Lens Galaxies: New Estimates from Microlensing
    We present a joint estimate of the stellar/dark matter mass fraction in lens galaxies and the average size of the accretion disk of lensed quasars based on...
  • Publication
    Deciphering Quasar Millilensing How to Distinguish Between Dark and Luminous Lenses
    Dwarf-galaxy sized dark matter halos may be detectable when a bright background source is gravitationally lensed on scales of milliarcseconds. Such effects can...
  • Publication
    Deconstructing the narrow-line region of the nearest obscured quasar
    We study the physical and kinematic properties of the narrow-line region (NLR) of the nearest obscured quasar MRK 477 (z = 0.037), using optical and near...
  • Publication
    Detecting microvariability in type 2 quasars using enhanced F-test
    Microvariability (intranight variability) is a low amplitude flux change at short time-scales (i.e. hours). It has been detected in unobscured type 1 active...
  • Publication
    Detection of an intranight optical hard lag with colour variability in blazar PKS 0735+178
    Blazars are a highly variable subclass of active galactic nuclei that have been observed to vary significantly during a single night. This intranight...