Astrophysical: Quasars

  • Publication
    Search for very high energy gamma-rays from the z = 0.896 quasar 4C +55.17 with the MAGIC telescopes
    The bright gamma-ray quasar 4C +55.17 is a distant source (z = 0.896) with a hard spectrum at GeV energies as observed by the Large Area Telescope (LAT) on...
  • Publication
    Serendipitous Discovery of a Projected Pair of QSOs Separated by 4.5 arcsec on the Sky
    We present the serendipitous discovery of a projected pair of quasi-stellar objects (QSOs) with an angular separation of Δθ = 4.50 arcsec. The redshifts of the...
  • Publication
    SHARDS: A Global View of the Star Formation Activity at z ~ 0.84 and z ~ 1.23
    In this paper, we present a comprehensive analysis of star-forming galaxies (SFGs) at intermediate redshifts (z ∼ 1). We combine the ultra-deep optical spectro...
  • Publication
    Short time-scale fluctuations in the difference light curves of QSO 0957+561A,B: microlensing or noise?
    From optical R-band data of the double quasar QSO 0957+561A,B, we made two new difference light curves (with an overlap of about 330d between the time-shifted...
  • Publication
    Simultaneous UBVRI photopolarimetric observations of blazars. II
    Results are presented from simultaneous UBVRI photopolarimetric observations of eight blazars at the 2.56-m Nordic Optical Telescope during winter 1991. In 3C...
  • Publication
    Single-epoch and Differential Astrometric Microlensing of Quasars
    We propose and discuss a new experimental approach to measure the centroid shift induced by gravitational microlensing in the images of lensed quasars...
  • Publication
    Size of the Accretion Disk in the Graviationally Lensed Quasar SDSS J1004+4112 from the Statistics of Microlensing Magnifications
    We present eight monitoring seasons of the four brightest images of the gravitational lens SDSS J1004+4112 observed between 2003 December and 2010 October...
  • Publication
    Sloan Digital Sky Survey Quasars in the Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE) ELAIS N1 Field: Properties and Spectral Energy Distributions
    We present a mid-infrared (MIR) analysis of 35 quasars with spectroscopic redshifts selected from the Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE)...
  • Publication
    Spatially resolved evidence of the impact of quasar-driven outflows on recent star formation: the case of Mrk 34
    We present the results of our spatially resolved investigation into the interplay between the ages of the stellar populations and the kinematics of the warm...