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Exploring the radio and GeV-TeV γ-ray connection in the different blazar sub-classes

Published online by Cambridge University Press:  07 April 2020

R. Lico Open the ORCID record for R. Lico [Opens in a new window] ,
M. Giroletti Open the ORCID record for M. Giroletti [Opens in a new window] ,
M. Orienti ,
L. Costamante ,
V. Pavlidou ,
F. D’Ammando  and
F. Tavecchio
R. Lico
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel, 69, D-53121 Bonn, Germany. email: [email protected] INAF - Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy.
M. Giroletti
Affiliation:
INAF - Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy.
M. Orienti
Affiliation:
INAF - Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy. DIFA, Università di Bologna, via Gobetti 93/3, 40129 Bologna, Italy.
L. Costamante
Affiliation:
ASI Unità Ricerca Scientifica, Via del Politecnico snc, I-00133, Roma, Italy.
V. Pavlidou
Affiliation:
Department of Physics and Institute for Plasma Physics, University of Crete, 71003Heraklion, Greece.
F. D’Ammando
Affiliation:
INAF - Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy.
F. Tavecchio
Affiliation:
INAF Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy.
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Abstract

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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.

Keywords

Galaxies: activeGamma rays: galaxiesRadio continuum: galaxiesBL Lacertae objects: general(Galaxies:) quasars: generalGalaxies: statistics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S342: Perseus in Sicily: From Black Hole to Cluster Outskirts , May 2018 , pp. 180 - 183
Copyright
© International Astronomical Union 2020

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