Astrophysical: Quasars

  • Publication
    Analysis of possible anomalies in the QSO distribution of the Flesch & Hardcastle catalogue
    Aims:A recent catalogue by Flesch & Hardcastle presents two major anomalies in the spatial distribution of QSO candidates: i) an apparent excess of such objects...
  • Publication
    Apparent correlation between extrinsic and intrinsic flux variations in the first gravitationally lensed quasar
    To better understand which sources contribute to optical passband fluxes of Q0957+561, we present and analyse light curves of the doubly imaged gravitationally...
  • Publication
    Are high polarization quasars and BL Lacertae objects really different? A study of the optical spectral properties.
    The continuum and emission lines properties of a sample of 73 blazars is studied, investigating differences and similarities among normal low-polarization...
  • Publication
    Are radio-loud Broad Absorption Line Quasars young sources?
    Studying Broad Absorption Line Quasars (BAL QSOs) is interesting because they probe the physics of the AGN environment, and because AGN outflows are important...
  • Publication
    Around the Clock Observations of the Q0957+561A,B Gravitationally Lensed Quasar
    An observing campaign with 10 participating observatories has undertaken to monitor the optical brightness of the Q0957 gravitationally lensed quasar for 10...
  • Publication
    Around-the-Clock Observations of the Q0957+561A,B Gravitationally Lensed Quasar. II. Results for the Second Observing Season
    We report on an observing campaign in 2001 March to monitor the brightness of the later arriving Q0957+561B image in order to compare with the previously...
  • News
    Astronomers find the first galaxy whose ultraviolet luminosity is comparable to that of a quasar
    An international scientific team, led by researchers at the Centre for Astrobiology (CAB, CSIC-INTA) and with participation by the Instituto de Astrofísica de...
  • Publication
    BH mass determination of low redshift quasars
    We present the analysis of the photometric and spectroscopic properties of a sample of 29 low redshift (z 0.6) QSOs for which both HST WFPC2 optical images and...
  • Publication
    Black hole masses for 14 gravitationally lensed quasars
    Aims: We have estimated black hole masses (M BH) for 14 gravitationally lensed quasars using Balmer lines; we also provide estimates based on MgII and CIV...