Exploring the radio and GeV-TeV γ-ray connection in the different blazar sub-classes. Issue Volume 14:Issue S342(2018) (May 2018)

• Record Type: Journal Article
• Authors: Lico, R.; Giroletti, M.; Orienti, M.; Costamante, L.; Pavlidou, V.; D'Ammando, F.; Tavecchio, F.
• Editors: Asada, Keiichi; de Gouveia Dal Pino, Elisabete; Giroletti, Marcello; Nagai, Hiroshi; Nemmen, Rodrigo
• Is Part Of: Proceedings of the International Astronomical Union. Volume 14:Issue S342(2018)
• Page Start: 180
• Page End: 183
• Publication Date: 2018-05
• Subjects: Galaxies: active, -- Gamma rays: galaxies, -- Radio continuum: galaxies, -- BL Lacertae objects: general, -- (Galaxies:) quasars: general, -- Galaxies: statistics; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921318007974
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: As revealed by the Fermi -LAT, blazars represent the dominant population of γ-ray emitters. An essential step for understanding blazar physics and the emission mechanisms is the investigation of a possible connection between the observed low- and high-energy emission. A number of works report on the existence of a significant correlation between radio emission and 0.1-100 GeV γ rays. How does this correlation evolve when very high energy (VHE, E > 0.1 TeV) γ rays are considered? The possible radio-VHE emission connection is still elusive mainly because of the lack of a homogeneous VHE sky coverage. In this work we explore the connection between the parsec-scale radio emission and GeV-TeV γ rays by using two unbiased blazar samples extracted from the 1FHL ( E > 10 GeV) and 2FHL (E > 50 GeV) Fermi catalogs. For comparison, we perform the same analysis by using the 3FGL 0.1-300 GeV γ-ray energy flux. Overall, we find out that there is no significant connection between radio and γ-ray emission above 10 GeV for all the blazar sub-classes with the exception of high synchrotron peaked objects. Conversely, when 0.1-300 GeV γ-ray energies are considered, a strong and significant correlation is found for all of the blazar sub-classes. We interpret these results within the context of the blazar spectral energy distribution properties.