Astrofísicas: Cuásares

  • Publicación
    An ALMA Band 7 survey of SDSS/Herschel quasars in Stripe 82: I. The properties of the 870 micron counterparts
    Context. Over the past 15 years, studies of quasars in the far-infrared (FIR) have reported host luminosities ranging from 10 12 to 10 14 L ⊙. These...
  • Publicación
    An excess of damped Lyman α galaxies near quasi-stellar objects
    We present a sample of 33 damped Lyman α systems (DLAs) discovered in the Sloan Digital Sky Survey (SDSS) whose absorption redshifts (zabs) are within 6000 km s...
  • Publicación
    An unusual iron Lo-BAL quasar detected by ISOCAM
    We report the discovery of an unusual low-ionization broad absorption line quasar at z=1.776 which exhibits absorption lines from many excited states of Fe II...
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    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...
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    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...
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    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...
  • Publicación
    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...
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    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...
  • Publicación
    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...