Astrofísicas: Cuásares

  • Publicación
    The quasar fraction in low-frequency-selected complete samples and implications for unified schemes
    Low-frequency radio surveys are ideal for selecting orientation-independent samples of extragalactic sources because the sample members are selected by virtue...
  • Publicación
    The quasar MBH-Mhost relation through cosmic time - I. Data set and black hole masses
    We study the relation as a function of cosmic time in a sample of 96 quasars from z = 3 to the present epoch. In this paper, we describe the sample, the data...
  • Publicación
    The quasar MBH-Mhost relation through cosmic time - II. Evidence for evolution from z = 3 to the present age
    We study the dependence of the relation on the redshift up to z = 3 for a sample of 96 quasars, the host galaxy luminosities of which are known. Black hole...
  • Publicación
    The radio luminosity function from the low-frequency 3CRR, 6CE and 7CRS complete samples
    We measure the radio luminosity function (RLF) of steep-spectrum radio sources using three redshift surveys of flux-limited samples selected at low (151 and...
  • Publicación
    The redshift and broad-band spectral energy distribution of NRAO 150
    Context. NRAO 150 is one of the brightest radio and mm AGN sources in the northern sky, and is an interesting source to study extreme relativistic jet phenomena...
  • Publicación
    The resolved size and structure of hot dust in the immediate vicinity of AGN
    We use VLTI/GRAVITY near-infrared interferometry measurements of eight bright type 1 AGN to study the size and structure of hot dust that is heated by the...
  • Publicación
    The ROSAT International X-ray/Optical Survey (RIXOS): source catalogue
    We describe the ROSAT International X-ray/Optical Survey (RIXOS), a medium-sensitivity survey and optical identification of X-ray sources discovered in ROSAT...
  • Publicación
    The ROSAT UK medium sensitivity survey.
    The authors present the first results on the optical identification of 89 ROSAT sources on the second Lockman hole. Because of the low Galactic H I column...
  • Publicación
    The ROSAT UK Medium Sensitivity Survey: optical identification and relation to X-ray spectral properties
    We present the first results on the optical identification of 89 sources with S(0.5-2 keV)>=1.7x10^-14 erg s^-1 cm^-2 detected in eight ROSAT Position Sensitive...