Astrophysical: Quasars

  • Publication
    MAGIC upper limits to the VHE gamma-ray flux of 3C 454.3 in high emission state
    Aims: We report upper limits to the very high energy flux (E>100 GeV) of the flat spectrum radio quasar 3C 454.3 (z=0.859) derived by the Cherenkov telescope...
  • Publication
    Magnetic support and Alfvén heating in quasar broad-line region clouds
    Gonçalves et al. (1996) showed the relevance of Alfvén heating in order to establish the stability of quasar broad-line region clouds in the intercloud medium...
  • News
    MARGARET BURBIDGE: "Los cuásares no están tan lejos como se pensaba"
    Margaret Burbidge y su marido, Geoffrey Burbidge, forman el matrimonio de científicos más conocido del mundo de la Astronomía. A lo largo de su vida han...
  • Publication
    Measuring Microlensing Using Spectra of Multiply Lensed Quasars
    We report on a program of spectroscopic observations of gravitationally lensed QSOs with multiple images. We seek to establish whether microlensing is occurring...
  • Publication
    Mergers and interactions in Sloan Digital Sky Survey type 2 quasars at z˜ 0.3-0.4. SDSS J143027.66-005614.8: a case study
    We present a compilation of Hubble Space Telescope (HST) images of 58 luminous Sloan Digital Sky Survey (SDSS) type 2 active galactic nuclei (AGNs) at ?. Of...
  • Publication
    Microlensing analysis of 14.5-year light curves in SDSS J1004+4112: Quasar accretion disk size and intracluster stellar mass fraction
    Context. The gravitational lens system SDSS J1004+4112 was the first known example of a quasar lensed by a galaxy cluster. The interest in this system has been...
  • Publication
    Microlensing and Intrinsic Variability of the Broad Emission Lines of Lensed Quasars
    We study the broad emission lines in a sample of 11 gravitationally lensed quasars with at least two epochs of observation to identify intrinsic variability and...
  • Publication
    Microlensing of a Biconical Broad-Line Region
    The influence of microlensing on the profiles of emission lines generated in a biconical geometry is discussed. Microlensing amplification in this anisotropic...
  • Publication
    Microlensing of Quasar Broad Emission Lines: Constraints on Broad Line Region Size
    We measure the differential microlensing of the broad emission lines between 18 quasar image pairs in 16 gravitational lenses. We find that the broad emission...