Astrofísicas: Objetos BL Lacertae

  • Publicación
    The complex variability of blazars: time-scales and periodicity analysis in S4 0954+65
    Among active galactic nuclei, blazars show extreme variability properties. We here investigate the case of the BL Lac object S4 0954+65 with data acquired in...
  • Publicación
    The connection between the low polarization quasar 3C 273 and blazars
    Photopolarimetric observations in UBVRI bands and near-infrared photometric observations of the low polarization quasar 3C 273 obtained between February 1989...
  • Publicación
    The dual nature of blazar fast variability: Space and ground observations of S5 0716+714
    Blazar S5 0716+714 is well-known for its short-term variability, down to intraday time-scales. We here present the 2-min cadence optical light curve obtained by...
  • Publicación
    The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3
    An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope is presented. This version (4LAC-DR3)...
  • Publicación
    The Gamma-Ray Bright BL Lacertae Object RX J1211+2242
    RX J1211+2242 is an optically faint (B~=19.2mag) but X-ray bright (f2-10keV=5×10-12ergscm-2s-1) active galactic nucleus (AGN) that has been shown to be a BL Lac...
  • Publicación
    The host galaxies of BL Lac objects in the near-infrared
    We present the results of near-infrared H band (1.65 μm) imaging of 11 BL Lac objects with redshifts ranging from z = 0.05 to 0.9. We are able to clearly detect...
  • Publicación
    The Host Galaxies of Radio-loud Active Galactic Nuclei: The Black Hole-Galaxy Connection
    We have studied the host galaxies of a sample of radio-loud active galactic nuclei (AGNs) spanning more than 4 decades in the energy output of the nucleus. The...
  • Publicación
    The Hubble Space Telescope Survey of BL Lacertae Objects. I. Surface Brightness Profiles, Magnitudes, and Radii of Host Galaxies
    We report on a large Hubble Space Telescope imaging survey of BL Lac objects, at spatial resolution >~10 times better than previous ground-based surveys. We...
  • Publicación
    The Hubble Space Telescope Survey of BL Lacertae Objects. II. Host Galaxies
    We have used the Hubble Space Telescope (HST) WFPC2 camera to survey 132 BL Lac objects comprising seven complete radio-, X-ray-, and optically selected samples...