Astrophysical: BL Lacertae objects

  • Publication
    Optical spectrophotometry of blazars
    We present optical spectrophotometric observations for 50 blazars obtained in 13 different campaigns over a 7 year period. The spectral flux distribution is...
  • Publication
    Optical Spectroscopic Survey of a Sample of Unidentified Fermi Objects
    We present optical spectroscopy secured at the 10 m Gran Telescopio Canarias of the counterparts of 20 extragalactic γ-ray sources detected by the Fermi...
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    Optical Spectroscopic Survey of a Sample of Unidentified Fermi Objects: II
    We report on optical spectroscopy obtained at the 10.4 m Gran Telescopio Canarias of 28 Fermi γ-ray sources that completes the study of a sample of 60 targets...
  • Publication
    Optical spectroscopy of BL Lac objects: TeV candidates
    We investigate the spectroscopic optical properties of gamma-ray sources detected with high significance above 50 GeV in the Third Catalog of Hard Fermi-LAT...
  • Publication
    Optical spectroscopy of blazars for the Cherenkov Telescope Array
    Context. Blazars are the most numerous class of high-energy (HE; E ∼ 50 MeV−100 GeV) and very high-energy (VHE; E ∼ 100 GeV−10 TeV) gamma-ray emitters...
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    Optical spectroscopy of blazars for the Cherenkov Telescope Array - II
    Active galactic nuclei (AGNs) make up about 35 per cent of the more than 250 sources detected in very high-energy (VHE) gamma rays to date with the imaging...
  • Publication
    Optical spectroscopy of blazars for the Cherenkov Telescope Array - III
    Context. Blazars, which include BL Lacs and flat-spectrum radio quasars, represent the brightest persistent extragalactic sources in the high-energy (HE; 10 MeV...
  • Publication
    Optical spectroscopy of blazars for the Cherenkov Telescope Array Observatory ─ IV
    Context. Blazars, comprising BL Lacertae objects (BL Lacs) and flat-spectrum radio quasars, are the most luminous extragalactic sources that dominate the γ-ray...
  • Publication
    Optical spectroscopy of high-redshift BL Lac objects
    BL Lac objects (BLLs) are defined by the presence of very weak (typically < 5 Å) or even absent spectral lines. This makes determining their distance...