Astrophysical: Quasars

  • Publication
    CCD monitoring of quasars and BL Lacertae objects
    Johnson B CCD photometry of quasars and other active nuclei were obtained with the 1-m and 2.5-m reflectors of the Roque de los Muchachos Observatory in the...
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    CCD monitoring of the X-ray variable quasar OX 169
    Three nights of broadband filter monitoring of the OX 169 variable X-ray quasar using a GEC-type CCD have yielded a 0.005 mag rms precision in the R band. Rapid...
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    Chandra Observations of the X-Ray Jet of 3C 273
    We report results from Chandra observations of the X-ray jet of 3C 273 during the calibration phase in 2000 January. The zeroth-order images and spectra from...
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    Circumgalactic medium of quasars: C IV absorption systems
    We investigate the properties of circumgalactic gas in the halo of quasar (QSO) host galaxies from C IV absorption-line systems. We use the optical spectroscopy...
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    Clear evidence for the early triggering of a luminous quasar-like active galactic nuclei in a major, gas-rich merger
    We present deep, intermediate resolution, long-slit Gemini GMOS-S optical spectra of the Sloan Digital Sky Survey (SDSS) type II quasar J002531-104022, which is...
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    Clustering of intermediate redshift quasars using the final SDSS III-BOSS sample
    We measure the two-point clustering of spectroscopically confirmed quasars from the final sample of the Baryon Oscillation Spectroscopic Survey (BOSS) on...
  • Publication
    Clustering of intermediate redshift quasars using the final SDSS III-BOSS sample
    We measure the two-point clustering of spectroscopically confirmed quasars from the final sample of the Baryon Oscillation Spectroscopic Survey (BOSS) on...
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    Coevolution of supermassive black holes and their host galaxies
    Accretion onto a supermassive black hole (BH) is the most viable explanation for the huge emitted luminosity in active galaxies. Nowadays a wealth of...
  • Publication
    Compact radio-loud Broad Absorption Line Quasars .
    For a long time, radio-loud Broad Absorption Line Quasars (BAL QSOs) were thought to be extremely rare objects. The absorbing troughs seen in their optical...