Conveners
Plenary 4: AGN
- benoit Lott (LPI2B)
Blazars are the most numerous extragalactic gamma-ray sources seen by Fermi. While their multi-wavelength emission is often considered as leptonic, recent detection of a very high energy neutrino event by IceCube in coincidence with a Fermi gamma-ray flare of the blazar TXS 0506+056 suggested a potential hadronic origin. This talk reviews the recent progress in multi-wavelength studies of...
A new era for multi-messenger astronomy has begun with the detection of the flaring gamma-ray blazar TXS 0506+056 in spatial and temporal coincidence with the high-energy neutrino IC-170922A. Since this outstanding result, several associations have been proposed between high-energy neutrinos and cosmic accelerators observed at different wavelengths. The Fermi-Large Area Telescope (LAT),...
The number of potential associations of very-high-energy neutrino alerts with flaring blazars is steadily increasing, leading to an emerging picture that blazars are a likely source of at least some of the IceCube-detected VHE neutrinos. In this talk, I will discuss the general physics requirements for neutrino production in blazar jets as well as recent modeling results of individual...
The under-explored MeV band has an extremely rich scientific potential. Awaiting an all-sky MeV mission, it is now the prime time to take full advantage of the capabilities of the Fermi Large Area Telescope to explore this regime. With more than 12 years of the best available dataset (Pass8), we have developed an all-sky analysis to build a sensitive catalog of sources from 20 to 200 MeV. This...
Blazars are jetted radio-loud active galactic nuclei of particular interest in astroparticle physics. Their non-thermal emission, which extends from radio to gamma rays, dominates their broadband spectrum and it is proof of cosmic particle acceleration and production of ultra-relativistic particles. Of particular importance in gamma-ray astronomy are the extreme high-synchrotron-peak (EHSP) BL...
Radio galaxies are galaxies with an active nucleus (AGN = active galactic nucleus), harboring a super-massive black hole, powering relativistic beams (jets) of particles that extend over thousands of light years into intergalactic space (see, e.g., Boettcher, Harris & Krawczynski, 2012, for an introductory text book). While bright radio emission produced in the jets and their termination...
