FERMI LAT View of a Sample of Flaring Gamma-Ray AGN

摘要

Radio-loud AGNs, especially blazars, are sources known to be extremely variable over the whole electromagnetic spectrum, from radio to γ-ray energies. Up to now, the Large Area Telescope (LAT), the primary instrument on board the Fermi satellite, has detected more than 850 sources that could be associated with AGNs. Several of them underwent at least one flaring episode at γ-rays during the time spanned by the Fermi observations. We present and discuss a list of flaring AGNs detected during the first 3.5 years of Fermi operations with fluxes brighter than F(E > 100MeV) > 10~(-6) ph cm~(-2) s~(-1), the threshold set by the LAT Collaboration for issuing an Astronomer Telegram. More, the general characteristics of the selected sample are investigated.