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Active Galactic Nuclei
(Asociación Argentina de Astronomía, 2008)
A short introduction to active galactic nuclei (AGN) phenomenology and basic physical facts is given. It starts with the early history of AGN, leading to the presently accepted standard model, based on accretion of matter ...
Polarization microvariability of BL Lac objects
(EDP Sciences, 2005-12)
We present the results of a systematic observational campaign designed to search for microvariability in the optical polarization of BL Lac objects. We have observed a sample formed by 8 X-ray-selected and 10 radio-selected ...
Rapid TeV Gamma-Ray Flaring of BL Lacertae
(Iop Publishing, 2013-01-10)
We report on the detection of a very rapid TeV gamma-ray flare from BL Lacertae on 2011 June 28 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). The flaring activity was observed during a 34.6 ...
Fermi large area telescope observations of markarian 421: the missing piece of its spectral energy distribution
(The Astrophysical Journal, 2011)