Astrophysical: BL Lacertae objects

  • Publication
    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...
  • Publication
    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...
  • Publication
    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)...
  • Publication
    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...
  • News
    The Gran Telescopio Canarias finds the farthest black hole that belongs to a rare family of galaxies
    An international team of astronomers has identified one of the rarest known classes of gamma-ray emitting galaxies, called BL Lacertae, within the first 2...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...