Conveners
Cosmology
- Jonathan Biteau (IPNO, Univ. Paris-Sud, Univ. Paris/Saclay, CNRS/IN2P3)
Elisa Pueschel
(Deutsches Elektronen-Synchrotron (DESY))
24/01/2019, 16:40
Main track
Talk
Recent progress in using very-high-energy gamma-ray observations to constrain the properties of the extragalactic background light and the intergalactic magnetic field is reviewed. Such studies capitalize on the scattering of gamma rays from distant emitters on diffuse photon fields, namely the extragalactic background light and cosmic microwave background. Observations of extreme blazars are...
Vaidehi Paliya
(Clemson University)
24/01/2019, 17:20
Talk
The light emitted by all galaxies across the history of the Universe is encoded in the intensity of the extragalactic background light (EBL), the diffuse cosmic radiation field at ultraviolet, optical, and infrared wavelengths. The EBL is a source of opacity for high-energy γ rays via the photon-photon interaction (γγ → e+e−), leaving a characteristic attenuation imprint in the spectra of...
Timur Dzhatdoev
(SINP MSU Moscow)
24/01/2019, 17:50
Main track
Talk
Extreme TeV blazars (ETB) are active galactic nuclei that have intrinsic spectral energy distribution (SED) peaked at an energy E>1 TeV. ETB, defined solely by very high energy (VHE, E>100 GeV) gamma-ray properties, have much in common with extreme highly peaked BL Lac objects (EHBL) [1], defined by broadband (in particular, X-ray) properties. Indeed, some blazars such as 1ES 0229+200 and 1ES...
Prof.
Alberto Franceschini
(UNIPD)
24/01/2019, 18:10
Main track
Talk
Extreme High Frequency Peaked BL Lacs (EHBL) are the cosmic sources able to produce the highest energy photons in the Universe. They make a relatively rare population of objects, difficult to identify also because they are quite faint at the energies probed by the Fermi surveys. Based on a hard X-ray selection, Foffano et al. have uncovered a small subset of such population. We discuss in the...
