Astrophysical: BL Lacertae objects

  • Publication
    The WEBT campaign on the BL Lac object PG 1553+113 in 2013. An analysis of the enigmatic synchrotron emission
    A multifrequency campaign on the BL Lac object PG 1553+113 was organized by the Whole Earth Blazar Telescope (WEBT) in 2013 April-August, involving 19 optical...
  • Publication
    The z=0.558 absorption system towards PKS 0118-272: A candidate Damped LY α system at low redshift.
    We present a study of the MgII absorption system at z=0.558 towards the BL Lac object PKS 0118-272 based on high resolution spectra (λ/{DELTA}λ=~2x10^4^)...
  • Publication
    UBVRI observations of BL Lacertae objects
    A total of 85 UBVRI observations of BL Lac objects is presented. For most of them, an average continuum can be traced by means of well-defined color indices...
  • Publication
    UBVRI observations of quasars
    UBVRI observations of 37 QSOs are reported. The sample is considered as a good representation of the bright (V not greater than 17) quasars in the compilation...
  • Publication
    Unprecedented study of the broadband emission of Mrk 421 during flaring activity in March 2010
    Context. Because of its proximity, Mrk 421 is one of the best sources on which to study the nature of BL Lac objects. Its proximity allows us to characterize...
  • Publication
    Unraveling the Complex Behavior of Mrk 421 with Simultaneous X-Ray and VHE Observations during an Extreme Flaring Activity in 2013 April
    We report on a multiband variability and correlation study of the TeV blazar Mrk 421 during an exceptional flaring activity observed from 2013 April 11 to 19...
  • Publication
    Variability and evolution of the optical polarization of a sample of gamma-ray blazars
    We present a polarization variability analysis of a sample of 26 γ-ray blazars monitored by the Steward Observatory between 2008 and 2018 in the optical band...
  • Publication
    Variable Very High Energy γ-Ray Emission from Markarian 501
    The blazar Mrk 501 was observed at energies above 0.10 TeV with the MAGIC Telescope from 2005 May through July. The high sensitivity of the instrument enabled...
  • Publication
    Visible and near-infrared monitoring of 3C279 in 1988-89
    Near infrared monitoring taken with the 1.5 m Carlos Sanchez Telescope in Tenerife of the decline of 3C279 during its 1988 outburst is presented. These data are...