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Interpreting the spectral energy distributions (SEDs) of astrophysical objects with physically motivated models is computationally expensive. These models require solving coupled differential equations in high-dimensional parameter spaces,…

Modeling the multiwavelength spectral energy distributions (SEDs) of blazars provides key insights into the underlying physical processes responsible for the emission. While SED modeling with self-consistent models is computationally…

High Energy Astrophysical Phenomena · Physics 2023-11-07 Damien Bégué , Narek Sahakyan , Hüsne Dereli Bégué , Paolo Giommi , Sargis Gasparyan , Mher Khachatryan , Andrea Casotto , Asaf Pe'er

In the context of modeling spectral energy distributions (SEDs) for blazars, we extend the method that uses a convolutional neural network (CNN) to include external inverse Compton processes. The model assumes that relativistic electrons…

High Energy Astrophysical Phenomena · Physics 2024-02-13 N. Sahakyan , D. Bégué , A. Casotto , H. Dereli-Bégué , P. Giommi , S. Gasparyan , V. Vardanyan , M. Khachatryan , A. Pe'er

We perform the first dedicated comparison of five hadronic codes (AM$^3$, ATHE$\nu$A, B13, LeHa-Paris, and LeHaMoC) that have been extensively used in modeling of the spectral energy distribution (SED) of jetted active galactic nuclei. The…

Blazars are promising candidates for high energy neutrino sources, yet the physical origin of their neutrino emission remains uncertain. In this work, we extend our previous study by modeling the broadband spectral energy distributions…

High Energy Astrophysical Phenomena · Physics 2026-05-12 Hubing Xiao , Zhihao Ouyang , Lili Yang , Jingtian Zhu , Minfeng Gu , Liang Chen , Shaohua Zhang , Zhijian Luo , Junhui Fan

Blazars are among the most studied sources in high-energy astrophysics as they form the largest fraction of extragalactic gamma-ray sources and are considered prime candidates for being the counterparts of high-energy astrophysical…

Modeling the broadband emission of blazars has become increasingly challenging with the advent of multimessenger observations. Building upon previous successes in applying convolutional neural networks (CNNs) to leptonic emission scenarios,…

High Energy Astrophysical Phenomena · Physics 2025-07-01 N. Sahakyan , D. Bégué , A. Casotto , H. Dereli-Bégué , V. Vardanyan , M. Khachatryan , P. Giommi , A. Pe'er

Active Galaxies with a jet pointing towards us, so-called blazars, play an important role in the field of high-energy astrophysics. One of the most important features in the classification scheme of blazars is the peak frequency of the…

High Energy Astrophysical Phenomena · Physics 2022-07-11 Theo Glauch , Tobias Kerscher , Paolo Giommi

Blazars emit across all electromagnetic wavelengths. While the so-called one-zone model has described well both quiescent and flaring states, it cannot explain the radio emission and fails in more complex data sets, such as AP Librae. In…

High Energy Astrophysical Phenomena · Physics 2023-07-10 Michael Zacharias , Anita Reimer , Catherine Boisson , Andreas Zech

We describe new implementations of leptonic and hadronic models for the broadband emission from relativistic jets in AGN in a temporary steady state. For the leptonic model, a temporary equilibrium between particle injection/acceleration,…

High Energy Astrophysical Phenomena · Physics 2015-06-15 M. Boettcher , A. Reimer , K. Sweeney , A. Prakash

Single-zone synchrotron self-Compton and external Compton models are widely used to explain broad-band Spectral Energy Distributions (SEDs) of blazars from infrared to gamma-rays. These models bear obvious similarities to the homogeneous…

The optical radiation emitted by blazars contains contributions from synchrotron radiation by relativistic electrons in the jets, as well as thermal radiation emitted mainly by the Accretion Disk (AD), the Broad Line Region (BLR) and the…

The characteristic two-component blazar spectral energy distribution (SED) can be of either leptonic and/or hadronic origins. The potential association of the high-energy neutrino event IceCube-170922A with the flaring blazar TXS~0506+056…

High Energy Astrophysical Phenomena · Physics 2019-05-15 Haocheng Zhang , Ke Fang , Hui Li , Dimitrios Giannios , Markus Böttcher , Sara Buson

(abr.) The spectral energy distribution (SED) of blazars typically has a double-humped appearance usually interpreted in terms of synchrotron self-Compton models. In proton blazar models, the SED is instead explained in terms of…

Astrophysics · Physics 2008-11-26 A. Muecke , R. J. Protheroe

We study the possibility to employ neural networks to simulate jet clustering procedures in high energy hadron-hadron collisions. We concentrate our analysis on the Fermilab Tevatron energy and on the $k_\bot$ algorithm. We consider both…

High Energy Physics - Phenomenology · Physics 2016-09-01 P. De Felice , G. Nardulli , G. Pasquariello

Blazars are promising high-energy neutrino source candidates. However, leptohadronic models face challenges in describing neutrino emission within a viable energy budget, and their predictive power is limited by the commonly used…

High Energy Astrophysical Phenomena · Physics 2026-04-08 Xavier Rodrigues , Frank Rieger , Artem Bohdan , Paolo Padovani

The one-zone synchrotron-self-Compton (SSC) model aims to describe the spectral energy distribution (SED) of BL Lac objects via synchrotron emission by a non-thermal population of electrons and positrons in a single homogeneous emission…

High Energy Astrophysical Phenomena · Physics 2013-08-19 Matteo Cerruti , Catherine Boisson , Andreas Zech

The overall spectra (SED) of blazars, from radio to gamma-ray energies, seem to obey well defined trends, with a continuity of properties between blazars of different classes. To quantify this statement we can either investigate their…

Astrophysics · Physics 2007-05-23 Gabriele Ghisellini

Using deep neural networks for identifying physics objects at the Large Hadron Collider (LHC) has become a powerful alternative approach in recent years. After successful training of deep neural networks, examining the trained networks not…

High Energy Physics - Phenomenology · Physics 2023-01-23 Taoli Cheng

Most active supermassive black holes (SMBH) in present-day galaxies are underfed and consist of low-luminosity active galactic nuclei (LLAGN). They have multiwavelength broadband spectral energy distributions (SED) dominated by non-thermal…

Astrophysics of Galaxies · Physics 2021-02-12 Ivan Almeida , Roberta Duarte , Rodrigo Nemmen
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