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Galaxies 2019, 7(1), 9; https://doi.org/10.3390/galaxies7010009

Monitoring the Extragalactic High Energy Sky

Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies, LPNHE, 4 Place Jussieu, F-75252 Paris, France
On behalf of the H.E.S.S. Collaboration.
Received: 27 November 2018 / Revised: 21 December 2018 / Accepted: 23 December 2018 / Published: 3 January 2019
(This article belongs to the Special Issue Monitoring the Non-Thermal Universe)
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Abstract

Blazars are jetted active galactic nuclei with a jet pointing close to the line of sight, hence enhancing their intrinsic luminosity and variability. Monitoring these sources is essential in order to catch them flaring and promptly organize follow-up multi-wavelength observations, which are key to providing rich data sets used to derive e.g., the emission mechanisms at work, and the size and location of the flaring zone. In this context, the Fermi-LAT has proven to be an invaluable instrument, whose data are used to trigger many follow-up observations at high and very high energies. A few examples are illustrated here, as well as a description of different data products and pipelines, with a focus given on FLaapLUC, a tool in use within the H.E.S.S. collaboration. View Full-Text
Keywords: active galactic nuclei; blazars; gamma rays; high energy; monitoring active galactic nuclei; blazars; gamma rays; high energy; monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lenain, J.-P. Monitoring the Extragalactic High Energy Sky. Galaxies 2019, 7, 9.

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