Astrophysical: BL Lacertae objects

  • 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...
  • Publication
    Changing Look of the Optical Spectrum of the MeV Blazar PKS 0446+112 (4FGL J0449.1+1121)
    Following the high activity of the γ-ray Fermi source 4FGL J0449.1+1121 (PKS 0446+112), possibly associated with a IceCube neutrino event IC-240105A, we...
  • Publication
    Characterization of Markarian 421 during its most violent year: Multiwavelength variability and correlations
    Aims. Mrk 421 was in its most active state around early 2010, which led to the highest TeV gamma-ray flux ever recorded from any active galactic nuclei (AGN)...
  • Publication
    Clustering environment of BL Lacertae object RGB 1745+398
    Aims: The BL Lac object RGB 1745+398 lies in an environment that makes it possible to study the cluster around it more deeply than the environments of other BL...
  • Publication
    Constraints on redshifts of blazars from extragalactic background light attenuation using Fermi-LAT data
    The extragalactic high-energy γ-ray sky is dominated by blazars, which are active galactic nuclei with their jets pointing towards us. Distance measurements are...
  • Publication
    Coordinated Multiwavelength Observation of 3C 66A during the WEBT Campaign of 2003-2004
    The BL Lac object 3C 66A was the target of an extensive multiwavelength monitoring campaign from 2003 July through 2004 April (with a core campaign from 2003...
  • Publication
    Coordinated visible and infrared monitoring of rapid variations of Markarian 501 - First results with FOVIA
    The paper presents simultaneous monitoring of the BL Lacertae object Markarian 501 obtained in the visible and near infrared using a double photometer system on...
  • Publication
    Correction to: The relation between optical and γ-ray emission in BL lac sources
  • Publication
    Detection of an intranight optical hard lag with colour variability in blazar PKS 0735+178
    Blazars are a highly variable subclass of active galactic nuclei that have been observed to vary significantly during a single night. This intranight...