Astrophysical: BL Lacertae objects

  • Publication
    Observation of Very High Energy γ-Rays from the AGN 1ES 2344+514 in a Low Emission State with the MAGIC Telescope
    The MAGIC collaboration has observed very high energy gamma-ray emission from the AGN 1ES 2344+514. A gamma-ray signal corresponding to an 11 σ excess and an...
  • Publication
    Observations of Markarian 421 with the MAGIC Telescope
    The MAGIC telescope took data of very high energy γ-ray emission from the blazar Markarian 421 (Mrk 421) between 2004 November and 2005 April. We present a...
  • Publication
    Observations of the Blazar 3C 66A with the Magic Telescopes in Stereoscopic Mode
    We report new observations of the intermediate-frequency peaked BL Lacertae object 3C 66A with the MAGIC telescopes. The data sample we use were taken in 2009...
  • Publication
    Observations of three BL Lacertae objects - Constraints on inhomogeneous relativistically beamed jet models
    Multifrequency observations are presented of three BL Lac objects, including the first UV measurements of 0912 + 297 and 1219 + 285. An eight day optical flare...
  • Publication
    OJ 287 and the predicted fade of 1998
    There were predictions that blazar OJ 287 should have faded in late 1997 or early 1998. The observational background for these predictions is the sudden fade of...
  • Publication
    On the Connection of the Apparent Proper Motion and the VLBI Structure of Compact Radio Sources
    Many of the compact extragalactic radio sources that are used as fiducial points to define the celestial reference frame are known to have proper motions...
  • Publication
    On the Redshift of TeV BL Lac Objects
    We report results of a spectroscopic campaign carried out at the 10 m Gran Telescopio Canarias for a sample of 22 BL Lac objects detected (or candidates) at TeV...
  • Publication
    On the redshift of the very high-energy gamma-ray BL Lac object S2 0109+22
    The determination of the redshift of extragalactic gamma-ray sources is of fundamental importance for the interpretation of their emission models and...
  • Publication
    Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity
    The BL Lacertae object AO 0235+16 is well known for its extreme optical and radio variability. New optical and radio data have been collected in the last four...