Astrophysical: BL Lacertae objects

  • Publication
    Simultaneous Multiwavelength Observations of the Blazar 1ES 1959+650 at a Low TeV Flux
    We present the results from a multiwavelength campaign on the TeV blazar 1ES 1959+650, performed in 2006 May. Data from the optical, UV, soft- and hard-X-ray...
  • Publication
    Spectral Energy Distribution of Markarian 501: Quiescent State Versus Extreme Outburst
    The very high energy (VHE; E > 100 GeV) blazar Markarian 501 (Mrk 501) has a well-studied history of extreme spectral variability and is an excellent laboratory...
  • Publication
    Spectral energy distribution of Palomar-Green BL Lacertae objects.
    Optical spectroscopy of three recently discovered BL Lacs (PG 1246+586, PG 1424+240 and PG 1437+398) in the Palomar-Green optical survey is presented. The three...
  • Publication
    Spectroscopy of 10 γ-Ray BL Lac Objects at High Redshift
    We present optical spectra with high signal-to-noise ratio of 10 BL Lac objects detected at GeV energies by the Fermi satellite (3FGL catalog), which previous...
  • Publication
    Statistical redshift of the very-high-energy blazar S5 0716+714
    Context. Blazars are the most numerous class of very-high-energy (VHE; E > 100 GeV) gamma-ray emitters. At present, measured redshifts are available only for...
  • Publication
    Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity
    Context. Markarian 501 (Mrk 501) is a very high-energy (VHE) gamma-ray blazar located at z = 0.034, which is regularly monitored by a wide range of multi...
  • Publication
    Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
    Suzaku observations of the blazar OJ 287 were performed in 2007 April 10-13 and November 7-9. They correspond to a quiescent and a flaring state, respectively...
  • Publication
    Synchrotron emission from the blazar PG 1553+113. An analysis of its flux and polarization variability
    In 2015 July 29-September 1, the satellite XMM-Newton pointed at the BL Lac object PG 1553+133 six times, collecting data for 218 h. During one of these epochs...
  • Publication
    Systematic Search for VHE Gamma-Ray Emission from X-Ray-bright High-Frequency BL Lac Objects
    All but three (M87, BL Lac, and 3C 279) extragalactic sources detected so far at very high energy γ-rays belong to the class of high-frequency-peaked BL Lac...