简介:1.IntroductionDuringthepast15yearsthecapabilitytomakemulti-λλobservationsofthemajorenergysourcesinthecentersofActiveGalaxieshassuppliedAstrophysicswithaverypowerfulnewtoolforthestudyoftheseobjects.MostoftheseapplicationshavebeendrivenbythesimultaneousavailabilityofSpacemissionsintheγ-ray,X-ray,UltravioletandInfrareddomain.Althoughtheconceptofmulti-λλobservationshasbeenobviouslyaroundforalongtime,therealpowerofthisobservationaltoolhasnotbeenfullyrealizeduntilitbecameclearthatmostobjects(alsoofcos...