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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3
LAT collaboration, Marco Ajello, Luca Baldini +100
An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi-Large Area Telescope is presented. This version (4LAC-DR3) derives from the thir…
Telescope Concepts in Gamma-Ray Astronomy
Thomas Siegert, Deirdre Horan, Gottfried Kanbach
This chapter outlines the general principles for the detection and characterisation of high-energy -ray photons in the energy range from MeV to GeV. Applications of these fundam…
Search for new cosmic-ray acceleration sites within the 4FGL catalog Galactic plane sources
LAT Collaboration, S. Abdollahi, F. Acero +117
Cosmic rays are mostly composed of protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions which in turn decay in…
A Gamma-ray Pulsar Timing Array Constrains the Nanohertz Gravitational Wave Background
M. Ajello, W. B. Atwood, L. Baldini +129
After large galaxies merge, their central supermassive black holes are expected to form binary systems whose orbital motion generates a gravitational wave background (GWB) at nanoh…
Multiwavelength variability power spectrum analysis of the blazars 3C 279 and PKS 1510-089 on multiple timescales
Arti Goyal, Marian Soida, Lukasz Stawarz +24
We present the results of variability power spectral density (PSD) analysis using multiwavelength radio to GeV\,-ray light curves covering decades/years to days/minutes timescal…