Related papers: Radio Galaxies with the Cherenkov Telescope Array

Blazars: the next gamma-ray view of GLAST

Blazars, the extreme family of AGN, can be strong gamma-ray emitters and constitute the largest fraction of identified point sources of EGRET. The next Gamma-ray Large Area Space Telescope (GLAST) is a high energy (30MeV-300GeV) gamma-ray…

Astrophysics · Physics 2007-05-23 Stefano Ciprini

The growing family of gamma-ray narrow-line Seyfert 1 galaxies

The revision of the fourth Fermi Large Area Telescope (LAT) catalog of gamma-ray point sources (rev4FGL) revealed that the gamma-ray sky is populated by emerging populations of jetted active galactic nuclei (AGN) other than blazars and…

High Energy Astrophysical Phenomena · Physics 2026-01-27 Luigi Foschini

Identifying Three New AGNs Among Fermi Unidentified Gigaelectronvolt Sources

We report our identification of three gigaelectronvolt $\gamma$-ray sources, 4FGL J0502.6+0036, 4FGL J1055.9+6507, and 4FGL J1708.2+5519, as Active Galactic Nuclei (AGNs). They are listed in the latest Fermi-LAT source catalog as…

High Energy Astrophysical Phenomena · Physics 2024-06-21 Shunhao Ji , Zhongxiang Wang , Qiangmeng Huang , Ruoheng Yang

JD6 - The Connection between Radio Properties and High Energy Emission in AGNs

While observations in the radio band are providing essential information on the innermost structures of relativistic jets in active galactic nuclei (AGN), the recent detection by Fermi of gamma-ray emission from many hundreds of blazars…

High Energy Astrophysical Phenomena · Physics 2015-06-11 G. Giovannini , T. Cheung

Gamma-ray emission from AGNs

Blazars, radio-loud active galactic nuclei with the relativistic jet closely aligned with the line of sight, dominate the extragalactic sky observed at gamma-ray energies, above 100 MeV. We discuss some of the emission properties of these…

High Energy Astrophysical Phenomena · Physics 2016-05-25 F. Tavecchio

The search of axion-like-particles with Fermi and Cherenkov telescopes

Axion Like Particles (ALPs), postulated to solve the strong-CP problem, are predicted to couple with photons in the presence of magnetic fields, which may lead to a significant change in the observed spectra of gamma-ray sources such as…

Cosmology and Nongalactic Astrophysics · Physics 2010-01-13 Miguel A. Sanchez-Conde , David Paneque , Elliott D. Bloom , Francisco Prada , Alberto Dominguez

MaNGA AGN dwarf galaxies (MAD) -- IV. Revealing hidden AGN in dwarf galaxies with radio observations

Low-mass black holes hosted by dwarf galaxies offer valuable insights into galaxy formation and the growth of the massive black holes found in massive galaxies. Their detection as AGN is challenging due to their low luminosity and compact…

Astrophysics of Galaxies · Physics 2026-01-14 I. Flores , M. Mezcua , V. Rodríguez Morales

A Catalogue of Variable Active Galactic Nuclei Based on Multi-Timescale Variability Analysis from Fermi-LAT Data

Active Galactic Nuclei (AGN) sources feature supermassive black holes that launch relativistic plasma jets. They are key $\gamma$-ray sources providing a unique laboratory for studying extreme particle acceleration and plasma physics.…

High Energy Astrophysical Phenomena · Physics 2026-02-03 Luana Passos-Reis , Elisabete M. de Gouveia Dal Pino , Tarek Hassan , Santiago Pita , Alberto Domínguez

Ground based gamma-ray astronomy with Cherenkov Telescopes

Very-high-energy (>100 GeV) gamma-ray astronomy is emerging as an important discipline in both high energy astrophysics and astro-particle physics. This field is currently dominated by Imaging Atmospheric-Cherenkov Telescopes (IACTs) and…

Astrophysics · Physics 2010-01-15 Jim Hinton

Dark Matter Line Searches with the Cherenkov Telescope Array

Monochromatic gamma-ray signals constitute a potential smoking gun signature for annihilating or decaying dark matter particles that could relatively easily be distinguished from astrophysical or instrumental backgrounds. We provide an…

High Energy Physics - Phenomenology · Physics 2024-07-24 S. Abe , J. Abhir , A. Abhishek , F. Acero , A. Acharyya , R. Adam , A. Aguasca-Cabot , I. Agudo , A. Aguirre-Santaella , J. Alfaro , R. Alfaro , N. Alvarez-Crespo , R. Alves Batista , J. -P. Amans , E. Amato , G. Ambrosi , L. Angel , C. Aramo , C. Arcaro , T. T. H. Arnesen , L. Arrabito , K. Asano , Y. Ascasibar , J. Aschersleben , H. Ashkar , M. Backes , A. Baktash , C. Balazs , M. Balbo , A. Baquero Larriva , V. Barbosa Martins , U. Barres de Almeida , J. A. Barrio , I. Batković , R. Batzofin , J. Baxter , J. Becerra González , G. Beck , W. Benbow , D. Berge , E. Bernardini , J. Bernete , K. Bernlöhr , A. Berti , B. Bertucci , P. Bhattacharjee , S. Bhattacharyya , C. Bigongiari , A. Biland , E. Bissaldi , J. Biteau , O. Blanch , J. Blazek , F. Bocchino , C. Boisson , J. Bolmont , G. Bonnoli , A. Bonollo , P. Bordas , Z. Bosnjak , E. Bottacini , M. Böttcher , T. Bringmann , E. Bronzini , R. Brose , A. M. Brown , G. Brunelli , A. Bulgarelli , T. Bulik , I. Burelli , L. Burmistrov , M. Burton , M. Buscemi , T. Bylund , J. Cailleux , A. Campoy-Ordaz , B. K. Cantlay , G. Capasso , A. Caproni , R. Capuzzo-Dolcetta , P. Caraveo , S. Caroff , A. Carosi , R. Carosi , E. Carquin , M. -S. Carrasco , F. Cassol , L. Castaldini , N. Castrejon , A. J. Castro-Tirado , D. Cerasole , M. Cerruti , P. M. Chadwick , S. Chaty , A. W. Chen , M. Chernyakova , A. Chiavassa , J. Chudoba , L. Chytka , G. M. Cicciari , A. Cifuentes , C. H. Coimbra Araujo , M. Colapietro , V. Conforti , F. Conte , J. L. Contreras , A. Costa , H. Costantini , G. Cotter , P. Cristofari , O. Cuevas , Z. Curtis-Ginsberg , G. D'Amico , F. D'Ammando , S. Dai , M. Dalchenko , F. Dazzi , A. De Angelis , M. de Bony de Lavergne , V. De Caprio , E. M. de Gouveia Dal Pino , B. De Lotto , M. De Lucia , R. de Menezes , M. de Naurois , V. de Souza , L. del Peral , M. V. del Valle , A. G. Delgado Giler , J. Delgado Mengual , C. Delgado , M. Dell'aiera , D. della Volpe , D. Depaoli , T. Di Girolamo , A. Di Piano , F. Di Pierro , R. Di Tria , L. Di Venere , C. Díaz , S. Diebold , A. Dinesh , J. Djuvsland , R. M. Dominik , D. Dominis Prester , A. Donini , D. Dorner , J. Dörner , M. Doro , J. -L. Dournaux , C. Duangchan , C. Dubos , L. Ducci , V. V. Dwarkadas , J. Ebr , C. Eckner , K. Egberts , S. Einecke , D. Elsässer , G. Emery , M. Errando , C. Escanuela , P. Escarate , M. Escobar Godoy , J. Escudero , P. Esposito , S. Ettori , D. Falceta-Goncalves , E. Fedorova , S. Fegan , Q. Feng , G. Ferrand , F. Ferrarotto , E. Fiandrini , A. Fiasson , M. Filipovic , V. Fioretti , M. Fiori , L. Foffano , L. Font Guiteras , G. Fontaine , S. Fröse , Y. Fukazawa , Y. Fukui , A. Furniss , G. Galanti , G. Galaz , C. Galelli , S. Gallozzi , V. Gammaldi , M. Garczarczyk , C. Gasbarra , D. Gasparrini , A. Ghalumyan , F. Gianotti , M. Giarrusso , J. G. Giesbrecht Formiga Paiva , N. Giglietto , F. Giordano , R. Giuffrida , J. -F. Glicenstein , J. Glombitza , P. Goldoni , J. M. González , M. M. González , J. Goulart Coelho , T. Gradetzke , J. Granot , D. Grasso , R. Grau , L. Gréaux , D. Green , J. G. Green , G. Grolleron , L. M. V. Guedes , O. Gueta , J. Hackfeld , D. Hadasch , P. Hamal , W. Hanlon , S. Hara , V. M. Harvey , T. Hassan , K. Hayashi , B. Heß , L. Heckmann , M. Heller , S. Hernández Cadena , O. Hervet , J. Hinton , N. Hiroshima , B. Hnatyk , R. Hnatyk , W. Hofmann , J. Holder , D. Horan , P. Horvath , T. Hovatta , M. Hrabovsky , D. Hrupec , M. Iarlori , T. Inada , F. Incardona , S. Inoue , Y. Inoue , F. Iocco , M. Iori , K. Ishio , M. Jamrozy , P. Janecek , F. Jankowsky , P. Jean , J. Jimenez Quiles , W. Jin , C. Juramy-Gilles , J. Jurysek , M. Kagaya , O. Kalekin , V. Karas , H. Katagiri , J. Kataoka , S. Kaufmann , D. Kazanas , D. Kerszberg , D. B. Kieda , T. Kleiner , G. Kluge , Y. Kobayashi , K. Kohri , N. Komin , P. Kornecki , K. Kosack , G. Kowal , H. Kubo , J. Kushida , A. La Barbera , N. La Palombara , M. Láinez , A. Lamastra , J. Lapington , P. Laporte , S. Lazarević , J. Lazendic-Galloway , M. Lemoine-Goumard , J. -P. Lenain , F. Leone , E. Leonora , G. Leto , E. Lindfors , M. Linhoff , I. Liodakis , A. Lipniacka , S. Lombardi , F. Longo , R. López-Coto , M. López-Moya , A. López-Oramas , S. Loporchio , J. Lozano Bahilo , P. L. Luque-Escamilla , O. Macias , P. Majumdar , M. Mallamaci , D. Malyshev , D. Mandat , G. Manicò , M. Mariotti , I. Márquez , P. Marquez , G. Marsella , J. Martí , G. A. Martínez , M. Martínez , O. Martinez , C. Marty , A. Mas-Aguilar , M. Mastropietro , D. Mazin , S. Menchiari , E. Mestre , J. -L. Meunier , D. M. -A. Meyer , M. Meyer , D. Miceli , M. Miceli , M. Michailidis , J. Michałowski , T. Miener , J. M. Miranda , A. Mitchell , M. Mizote , T. Mizuno , R. Moderski , M. Molero , C. Molfese , E. Molina , T. Montaruli , A. Moralejo , D. Morcuende , A. Morselli , E. Moulin , V. Moya Zamanillo , K. Munari , T. Murach , A. Muraczewski , H. Muraishi , T. Nakamori , A. Nayak , R. Nemmen , J. P. Neto , L. Nickel , J. Niemiec , D. Nieto , M. Nievas Rosillo , M. Nikołajuk , L. Nikolić , K. Nishijima , K. Noda , D. Nosek , V. Novotny , S. Nozaki , M. Ohishi , Y. Ohtani , A. Okumura , J. -F. Olive , R. A. Ong , M. Orienti , R. Orito , M. Orlandini , E. Orlando , S. Orlando , M. Ostrowski , J. Otero-Santos , I. Oya , I. Pagano , A. Pagliaro , M. Palatiello , G. Panebianco , D. Paneque , F. R. Pantaleo , J. M. Paredes , N. Parmiggiani , B. Patricelli , A. Pe'er , M. Pech , M. Pecimotika , U. Pensec , M. Peresano , J. Pérez-Romero , M. Persic , K. P. Peters , O. Petruk , G. Piano , E. Pierre , E. Pietropaolo , M. Pihet , L. Pinchbeck , G. Pirola , C. Pittori , C. Plard , F. Podobnik , M. Pohl , V. Pollet , G. Ponti , E. Prandini , G. Principe , C. Priyadarshi , N. Produit , M. Prouza , E. Pueschel , G. Pühlhofer , M. L. Pumo , F. Queiroz , A. Quirrenbach , S. Rainò , R. Rando , S. Razzaque , M. Regeard , A. Reimer , O. Reimer , A. Reisenegger , W. Rhode , D. Ribeiro , M. Ribó , C. Ricci , T. Richtler , J. Rico , F. Rieger , L. Riitano , V. Rizi , E. Roache , G. Rodriguez Fernandez , M. D. Rodríguez Frías , J. J. Rodríguez-Vázquez , P. Romano , G. Romeo , J. Rosado , A. Rosales de Leon , G. Rowell , B. Rudak , A. J. Ruiter , C. B. Rulten , I. Sadeh , L. Saha , T. Saito , H. Salzmann , M. Sánchez-Conde , H. Sandaker , P. Sangiorgi , H. Sano , M. Santander , R. Santos-Lima , V. Sapienza , T. Šarić , A. Sarkar , S. Sarkar , F. G. Saturni , S. Savarese , A. Scherer , F. Schiavone , P. Schipani , B. Schleicher , P. Schovanek , J. L. Schubert , U. Schwanke , M. Seglar Arroyo , I. R. Seitenzahl , O. Sergijenko , M. Servillat , T. Siegert , H. Siejkowski , C. Siqueira , V. Sliusar , A. Slowikowska , H. Sol , S. T. Spencer , D. Spiga , A. Stamerra , S. Stanič , T. Starecki , R. Starling , Ł. Stawarz , C. Steppa , E. Sæther Hatlen , T. Stolarczyk , J. Strišković , Y. Suda , P. Świerk , H. Tajima , D. Tak , M. Takahashi , R. Takeishi , T. Tavernier , L. A. Tejedor , K. Terauchi , M. Teshima , V. Testa , W. W. Tian , L. Tibaldo , O. Tibolla , C. J. Todero Peixoto , F. Torradeflot , D. F. Torres , G. Tosti , N. Tothill , F. Toussenel , A. Tramacere , P. Travnicek , G. Tripodo , A. Trois , S. Truzzi , A. Tutone , L. Vaclavek , M. Vacula , P. Vallania , R. Vallés , C. van Eldik , J. van Scherpenberg , J. Vandenbroucke , V. Vassiliev , M. Vázquez Acosta , M. Vecchi , S. Ventura , S. Vercellone , G. Verna , A. Viana , N. Viaux , A. Vigliano , J. Vignatti , C. F. Vigorito , J. Villanueva , E. Visentin , V. Vitale , V. Vodeb , V. Voisin , V. Voitsekhovskyi , S. Vorobiov , G. Voutsinas , I. Vovk , T. Vuillaume , S. J. Wagner , R. Walter , M. White , R. White , A. Wierzcholska , M. Will , D. A. Williams , F. Wohlleben , A. Wolter , T. Yamamoto , L. Yang , T. Yoshida , T. Yoshikoshi , G. Zaharijas , L. Zampieri , R. Zanmar Sanchez , D. Zavrtanik , M. Zavrtanik , A. A. Zdziarski , A. Zech , W. Zhang , V. I. Zhdanov , K. Ziętara , M. Živec , J. Zuriaga-Puig

Gamma-ray emission from Narrow-Line Seyfert 1 Galaxies and implications on the jets unification

The recent discovery by Fermi/LAT of high-energy (E>100 MeV) gamma rays from Narrow-Line Seyfert 1 Galaxies (NLS1s) made evident the existence of a third class of gamma-ray emitting Active Galactic Nuclei (AGN), after blazars and radio…

High Energy Astrophysical Phenomena · Physics 2015-06-11 Luigi Foschini

AGN sudies above 1.5 TeV with the HEGRA 5 m^2 Cherenkov Telescope (Sources observed: Mkn 421, Mkn 501, MS 0116+319, PKS 2209+236, NGC 315 and W Comae)

The HEGRA 5 m^2 air Cherenkov telescope (CT1) was used to search for gamma-ray emission above 1.5 TeV from a series of low redshift AGN (Mkn 421, Mkn 501, MS 0116+319, PKS 2209+236, NGC 315 and W Comae). Here we present results from a total…

Astrophysics · Physics 2007-05-23 D. Petry , S. M. Bradbury , A. Konopelko , D. Kranich , B. C. Raubenheimer , the HEGRA collaboration

Gamma-ray Astronomy: Implications for Fundamental Physics

Gamma-ray Astronomy studies cosmic accelerators through their electromagnetic radiation in the energy range between ~100 MeV and ~100 TeV. The present most sensitive observations in this energy band are performed, from space, by the Large…

High Energy Astrophysical Phenomena · Physics 2011-11-29 Javier Rico

Unified Schemes for Radio-Loud Active Galactic Nuclei

The appearance of active galactic nuclei (AGN) depends so strongly on orientation that our current classification schemes are dominated by random pointing directions instead of more interesting physical properties. Light from the centers of…

Astrophysics · Physics 2011-07-18 C. Megan Urry , Paolo Padovani

Very High Energy Gamma Rays from Ultra Fast Outflows

Context. Ultra fast outflows (UFOs) from active galactic nuclei (AGN) are expected to lead to the formation of sub-relativistic strong shocks expanding in a dense circumnuclear medium, and thus have the potential for being efficient…

High Energy Astrophysical Phenomena · Physics 2026-05-06 B. Le Nagat Neher , E. Peretti , P. Cristofari , A. Zech

Search for GeV gamma-ray emission from clusters of galaxies studied by TeV telescopes

A cluster of galaxies is a huge system bounded by gravitation, and cosmic rays are thought to be confined in the system, thus it should contain much non-thermal components. Many theories predict significant gamma-ray emission that could be…

High Energy Astrophysical Phenomena · Physics 2009-12-18 Masaki Mori

A search for VHE counterparts of Galactic Fermi bright sources and MeV to TeV spectral characterization

Very high-energy (VHE; E>100 GeV) gamma-rays have been detected from a wide range of astronomical objects, such as pulsar wind nebulae (PWNe), supernova remnants (SNRs), giant molecular clouds, gamma-ray binaries, the Galactic Center,…

High Energy Astrophysical Phenomena · Physics 2015-03-13 P. H. Thomas Tam , Stefan Wagner , Omar Tibolla , Ryan Chaves

Hunting for treasures among the Fermi unassociated sources: a multi-wavelength approach

The Fermi Gamma-ray Space Telescope has been detecting a wealth of sources where the multi-wavelength counterpart is either inconclusive or missing altogether. We present a combination of factors that can be used to identify…

High Energy Astrophysical Phenomena · Physics 2015-06-17 F. Acero , D. Donato , R. Ojha , J. Stevens , P. G. Edwards , E. Ferrara , J. Blanchard , J. E. J. Lovell , D. J. Thompson

Very High Energy Gamma-Ray Astronomy

We present a review of the current status of very high energy gamma-ray astronomy. The development of the atmospheric Cherenkov imaging technique for ground-based gamma-ray astronomy has led to a rapid growth in the number of observatories.…

Astrophysics · Physics 2009-10-31 Michael Catanese , Trevor C. Weekes

High Energy Astrophysics

The development of the atmospheric Cherenkov imaging technique has led to significant advances in gamma-ray detection sensitivity in the energy range from 200 GeV to 50 TeV. The Whipple Observatory 10m reflector has detected the first…

Astrophysics · Physics 2007-05-23 T. C. Weekes