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Related papers: Towards a unified scheme of blazar evolution

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The processes governing the production of astrophysical high-energy neutrinos are still debated, and the sources originating them remain an open question. Among the putative emitters, active galactic nuclei have gained increasing attention.…

Blazars display strong variability on multiple timescales and in multiple radiation bands. Their variability is often characterized by power spectral densities (PSDs) and time lags plotted as functions of the Fourier frequency. We develop a…

Astrophysics of Galaxies · Physics 2015-06-19 Justin D. Finke , Peter A. Becker

The Fermi and Swift satellites, together with ground based Cherenkov telescopes, has greatly improved our knowledge of blazars, namely Flat Spectrum Radio Quasars and BL Lac objects, since all but the most powerful emit most of their…

High Energy Astrophysical Phenomena · Physics 2015-06-17 G. Ghisellini

Blazars are some of the brightest UV and X-ray sources in the sky and are valuable probes of the elusive warm-hot intergalactic medium (WHIM; $T{\simeq} 10^5-10^7$ K). However, many of the brightest blazars$-$called BL Lac objects such as…

Astrophysics of Galaxies · Physics 2021-12-15 J. Dorigo Jones , S. D. Johnson , Sowgat Muzahid , J. Charlton , H. -W. Chen , A. Narayanan , Sameer , J. Schaye , N. A. Wijers

We present a catalog of central engine properties, i.e., black hole mass (mbh) and accretion luminosity (ld), for a sample of 1077 blazars detected with the Fermi~Large Area Telescope. This includes broad emission line systems and blazars…

High Energy Astrophysical Phenomena · Physics 2021-04-07 Vaidehi S. Paliya , A. Domínguez , M. Ajello , A. Olmo-García , D. Hartmann

Blazars are highly variable and display complex characteristics. A key characteristic is the flux probability distribution function or flux PDF whose shape depends upon the form of the underlying physical process driving variability. The BL…

High Energy Astrophysical Phenomena · Physics 2020-01-09 Nachiketa Chakraborty

The concept of the evolutionary sequence of jetted active galactic nuclei (AGNs) has been challenged in the last few decades since AGN subclasses are considered to be different due to their viewing angle. In this paper, we collected a…

Astrophysics of Galaxies · Physics 2022-01-26 Evaristus U. Iyida , Christian I. Eze , Finbarr C. Odo

We discuss a new method for unveiling the possible blazar AGN nature among the numerous population of Unassociated Gamma-ray sources (UGS) in the Fermi catalogues. Our tool relies on positional correspondence of the Fermi object with X-ray…

High Energy Astrophysical Phenomena · Physics 2017-05-31 Simona Paiano , Alberto Franceschini , Antonio Stamerra

Statistical analyses are invaluable methods used to understand intrinsic emission processes and the unification of extragalactic radio sources. In this paper, we collected radio, X-ray and {\gamma}-ray data of blazars from the Fermi-LAT and…

High Energy Astrophysical Phenomena · Physics 2021-12-08 E. U. Iyida , I. O. Eya , F. C. Odo

Blazars are known to exhibit variability across a broad range of timescales. This behavior can include periodicity in their $\gamma$-ray emission, whose clear detection remains an ongoing challenge, partly due to the inherent stochasticity…

High Energy Astrophysical Phenomena · Physics 2025-07-08 P. Peñil , M. Ajello , S. Buson , A. Domínguez , J. R. Westernacher-Schneider , A. Rico , S. Adhikari , J. Zrake

Blazars are the established sources of an intense and variable non-thermal radiation extending from radio wavelengths up to HE and VHE gamma-rays. Understanding the spectral evolution of blazars in selected frequency ranges, as well as…

High Energy Astrophysical Phenomena · Physics 2014-12-24 Alicja Wierzcholska , Michał Ostrowski , Łukasz Stawarz , Stefan Wagner , Marcus Hauser

Blazars exhibit stochastic flux variability across the electromagnetic spectrum, often exhibiting heavy-tailed flux distributions, commonly modeled as lognormal. However, Tavecchio et al. (2020) and Adams et al. (2022) found that the…

High Energy Astrophysical Phenomena · Physics 2022-09-21 Aryeh Brill

The identification and classification of Fermi blazars are core topics in high-energy astrophysics. To enable precise spatial cross-identification, we constructed two high-precision catalogs: the updated 4FGL-Xiang-DR2 (DR2) and a…

High Energy Astrophysical Phenomena · Physics 2026-01-27 Yunchuan Xiang , Yingzhi Ye , Peng Feng , Huili , Xiankai Pang , Xiaofei Lan , Qingquan Jiang , Ningfeng Zhang

Blazars are a highly-variable, radio-loud subclass of active galactic nuclei (AGN). In order to better understand such objects we must be able to easily identify candidate blazars from the growing population of unidentified sources. Working…

High Energy Astrophysical Phenomena · Physics 2015-06-16 Philip S. Cowperthwaite , F. Massaro , R. D'Abrusco , A. Paggi , G. Tosti , Howard A. Smith

We study the relation between the mass accretion rate, the jet power, and the black hole mass of blazars. To this aim, we make use of the Sloan Digital Sky Survey (SDSS) and the 11 months catalog of blazars detected at energies larger than…

High Energy Astrophysical Phenomena · Physics 2012-05-18 T. Sbarrato , G. Ghisellini , L. Maraschi , M. Colpi

The gamma-ray emission from Flat Spectrum Radio Quasars (FSRQs), a sub-class of blazars, is believed to be generated through interactions of high-energy leptons and/or hadrons in the jet with the ambient photon fields, including those from…

High Energy Astrophysical Phenomena · Physics 2025-02-07 Anton Dmytriiev , Atreya Acharyya , Markus Böttcher

The past 20 years have seen phenomenal progress in our understanding of BL Lac objects. They form part of the blazar class, which are radio-loud AGN whose relativistic jets are aligned along our line of sight. Several critical milestones…

Astrophysics · Physics 2007-05-23 C. Megan Urry

Variable \gama-ray emission from blazars, one of the most powerful classes of astronomical sources featuring relativistic jets, is a widely discussed topic. In this work, we present the results of a variability study of a sample of 20…

High Energy Astrophysical Phenomena · Physics 2021-09-22 Jaroslaw Duda , Gopal Bhatta

We present the results of an identification campaign of unassociated sources from the Fermi Large Area Telescope 3FHL catalog. Out of 200 unidentified sources, we selected 110 sources for which archival Swift-XRT observations were…

High Energy Astrophysical Phenomena · Physics 2019-01-25 Amanpreet Kaur , Marco Ajello , Stefano Marchesi , Nicola Omodei

We investigate the blazar contribution to the cumulative neutrino intensity assuming a generic relationship between neutrino and gamma-ray luminosities, $L_{\nu}\propto (L_{\rm ph})^{\gamma_{\rm lw}}$. Using the gamma-ray luminosity…

High Energy Astrophysical Phenomena · Physics 2020-02-13 Chengchao Yuan , Kohta Murase , Peter Mészáros