Astrophysical: BL Lacertae objects

  • Publication
    Intense blazar activity in the photopolarimetric light curve of OJ 287
    We present a detailed analysis on photopolarimetric monitoring on OJ 287 conducted at the Nordic Optical Telescope during January 1991. Large rapid variations...
  • Publication
    Internight and intranight variations in the wavelength dependent polarization of OJ 287
    Simultaneous UBVRI photopolarimetric observations of the highly variable BL Lac object OJ 287 have been obtained on six nights. The polarization and position...
  • Publication
    Investigating the peculiar emission from the new VHE gamma-ray source H1722+119
    The Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes observed the BL Lac object H1722+119 (redshift unknown) for six consecutive nights between...
  • Publication
    Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017
    Aims: We present a detailed characterisation and theoretical interpretation of the broadband emission of the paradigmatic TeV blazar Mrk 421, with a special...
  • Publication
    Large-scale environments of z < 0.4 active galaxies
    Context. Properties of galaxies depend on their large-scale environment. As the influence of active galactic nuclei (AGN) in galaxy evolution is becoming more...
  • Publication
    Long-term multi-wavelength study of 1ES 0647+250
    Context. The BL Lac object 1ES 0647+250 is one of the few distant γ-ray emitting blazars detected at very high energies (VHEs; ≳100 GeV) during a non-flaring...
  • Publication
    Long-term multi-wavelength variability and correlation study of Markarian 421 from 2007 to 2009
    Aims: We study the multi-band variability and correlations of the TeV blazar Mrk 421 on year timescales, which can bring additional insight on the processes...
  • Publication
    Long-term Multiband Near-infrared Variability of the Blazar OJ 287 during 2007-2021
    We present the most extensive and well-sampled long-term multiband near-infrared (NIR) temporal and spectral variability study of OJ 287, considered to be the...
  • Publication
    MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524
    The high-frequency-peaked BL Lac (HBL) 1ES 0806+524 (z = 0.138) was discovered in very high energy (VHE) γ-rays in 2008. Until now, the broad-band spectrum of...