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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PublicaciónAnalysis of possible anomalies in the QSO distribution of the Flesch & Hardcastle catalogueAims: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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PublicaciónApparent correlation between extrinsic and intrinsic flux variations in the first gravitationally lensed quasarTo 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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PublicaciónAre 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...
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PublicaciónAre 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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PublicaciónAround the Clock Observations of the Q0957+561A,B Gravitationally Lensed QuasarAn observing campaign with 10 participating observatories has undertaken to monitor the optical brightness of the Q0957 gravitationally lensed quasar for 10...
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PublicaciónAround-the-Clock Observations of the Q0957+561A,B Gravitationally Lensed Quasar. II. Results for the Second Observing SeasonWe 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...
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PublicaciónBH mass determination of low redshift quasarsWe 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...
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PublicaciónBlack hole masses for 14 gravitationally lensed quasarsAims: 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...