Related papers: AGILE and blazar studies

An updated survey of Active Galaxies with the HAWC gamma-ray observatory

We present an update of the survey of Active Galaxies with the High Altitude Water Cherenkov (HAWC) gamma-ray observatory. This work adds 567 days of HAWC data to the previously published survey, providing a refined analysis of an updated…

High Energy Astrophysical Phenomena · Physics 2023-10-05 Fernando Ureña-Mena , Alberto Carramiñana , Daniel Rosa-González , Anna Lia Longinotti , HAWC Collaboration

AGILE: a Gamma-Ray Mission for a Light Imaging Detector

AGILE is an innovative, cost-effective gamma-ray mission proposed to the ASI Program of Small Scientific Missions. It is planned to detect gamma-rays in the 30 MeV - 50 GeV energy band and operate as an {\bf Observatory} open to the…

Astrophysics · Physics 2016-08-30 M. Tavani , G. Barbiellini , P. Caraveo , S. Di Pippo , S. Mereghetti , A , Morselli , A. Pellizzoni , A. Perrino , P. Picozza , P. Schiavon , S. Severoni , F. Tavecchio , A. Vacchi , S. Vercellone

VHE Analyses of Long-Term Low-Flux-State Observations by VERITAS of Intermediate-Frequency-Peaked BL Lacertae Sources: 3C 66A and W Comae

Intermediate-frequency-peaked BL Lacertae objects (IBLs) are a class of blazars characterized by a spectral energy distribution (SED) with a lower-energy synchrotron peak than the majority of extragalactic sources detected by ground-based…

High Energy Astrophysical Phenomena · Physics 2019-08-14 Juliana Vievering

Observation of GRBs with AGILE

Since its early phases of operation, the AGILE satellite is observing Gamma Ray Bursts (GRBs) over an energy range potentially spanning six orders of magnitude. In the hard X-ray band the SuperAGILE imager provides localization of about one…

High Energy Astrophysical Phenomena · Physics 2009-06-09 M. Marisaldi , G. Barbiellini , E. Costa , S. Cutini , E. Del Monte , I. Donnarumma , Y. Evangelista , M. Feroci , F. Fuschino , M. Galli , A. Giuliani , C. Labanti , I. Lapshov , F. Lazzarotto , P. Lipari , F. Longo , S. Mereghetti , E. Moretti , L. Pacciani , M. Rapisarda , P. Soffitta , M. Tavani , M. Trifoglio , S. Vercellone

AGILE detection of a candidate gamma-ray precursor to the ICECUBE-160731 neutrino event

On July 31st, 2016, the ICECUBE collaboration reported the detection of a high-energy starting event induced by an astrophysical neutrino. We report here about the search for a gamma-ray counterpart of the ICECUBE-160731 event made with the…

High Energy Astrophysical Phenomena · Physics 2017-09-15 F. Lucarelli , C. Pittori , F. Verrecchia , I. Donnarumma , M. Tavani , A. Bulgarelli , A. Giuliani , L. A. Antonelli , P. Caraveo , P. W. Cattaneo , S. Colafrancesco , F. Longo , S. Mereghetti , A. Morselli , L. Pacciani , G. Piano , A. Pellizzoni , M. Pilia , A. Rappoldi , A. Trois , S. Vercellone

A First Synoptic Blazar Study Comprising Thirteen Blazars Visible in E>100 GeV Gamma-Rays

Since 2002, the number of detected blazars at E_\gamma > 100 GeV has more than doubled. I study all currently known BL Lac-type objects with published energy spectra. Their intrinsic energy spectra are reconstructed by removing…

Astrophysics · Physics 2009-01-08 Robert Wagner

Simultaneous multi-frequency observation of the unknown redshift blazar PG 1553+113 in March-April 2008

The blazar PG 1553+113 is a well known TeV gamma-ray emitter. In this paper, we determine its spectral energy distribution using simultaneous multi-frequency data in order to study its emission processes. An extensive campaign was carried…

High Energy Astrophysical Phenomena · Physics 2016-08-14 MAGIC Collaboration , J. Aleksić , H. Anderhub , L. A. Antonelli , P. Antoranz , M. Backes , C. Baixeras , S. Balestra , J. A. Barrio , D. Bastieri , J. Becerra González , J. K. Becker , W. Bednarek , A. Berdyugin , K. Berger , E. Bernardini , A. Biland , R. K. Bock , G. Bonnoli , P. Bordas , D. Borla Tridon , V. Bosch-Ramon , D. Bose , I. Braun , T. Bretz , D. Britzger , M. Camara , E. Carmona , A. Carosi , P. Colin , S. Commichau , J. L. Contreras , J. Cortina , M. T. Costado , S. Covino , F. Dazzi , A. De Angelis , E. de Cea del Pozo , R. De los Reyes , B. De Lotto , M. De Maria , F. De Sabata , C. Delgado Mendez , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , D. Elsaesser , M. Errando , D. Ferenc , E. Fernández , R. Firpo , M. V. Fonseca , L. Font , N. Galante , R. J. García López , M. Garczarczyk , M. Gaug , N. Godinovic , F. Goebel , D. Hadasch , A. Herrero , D. Hildebrand , D. Höhne-Mönch , J. Hose , D. Hrupec , C. C. Hsu , T. Jogler , S. Klepser , T. Krähenbühl , D. Kranich , A. La Barbera , A. Laille , E. Leonardo , E. Lindfors , S. Lombardi , F. Longo , M. López , E. Lorenz , P. Majumdar , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , M. Meucci , J. M. Miranda , R. Mirzoyan , H. Miyamoto , J. Moldón , M. Moles , A. Moralejo , D. Nieto , K. Nilsson , J. Ninkovic , R. Orito , I. Oya , R. Paoletti , J. M. Paredes , M. Pasanen , D. Pascoli , F. Pauss , R. G. Pegna , M. A. Perez-Torres , M. Persic , L. Peruzzo , F. Prada , E. Prandini , N. Puchades , I. Puljak , I. Reichardt , W. Rhode , M. Ribó , J. Rico , M. Rissi , S. Rügamer , A. Saggion , T. Y. Saito , M. Salvati , M. Sánchez-Conde , K. Satalecka , V. Scalzotto , V. Scapin , T. Schweizer , M. Shayduk , S. N. Shore , A. Sierpowska-Bartosik , A. Sillanpää , J. Sitarek , D. Sobczynska , F. Spanier , S. Spiro , A. Stamerra , B. Steinke , N. Strah , J. C. Struebig , T. Suric , L. Takalo , F. Tavecchio , P. Temnikov , D. Tescaro , M. Teshima , D. F. Torres , N. Turini , H. Vankov , R. M. Wagner , V. Zabalza , F. Zandanel , R. Zanin , J. Zapatero , E. Pian , V. Bianchin , F. D'Ammando , G. Di Cocco , D. Fugazza , G. Ghisellini , O. M. Kurtanidze , C. M. Raiteri , G. Tosti , A. Treves , S. Vercellone , M. Villata

The First AGILE Solar Flare Catalog

We report the Astrorivelatore Gamma ad Immagini LEggero (AGILE) observations of solar flares, detected by the on board anticoincidence system in the 80-200 keV energy range, from 2007 May 1st to 2022 August 31st. In more than 15 yr, AGILE…

Solar and Stellar Astrophysics · Physics 2023-07-12 Alessandro Ursi , Nicolò Parmiggiani , Mauro Messerotti , Alberto Pellizzoni , Carlotta Pittori , Francesco Longo , Francesco Verrecchia , Andrea Argan , Andrea Bulgarelli , Marco Tavani , Patrizio Tempesta , Fabio D'Amico

First Multi-wavelength Campaign on the Gamma-ray-loud Active Galaxy IC 310

The extragalactic VHE gamma-ray sky is rich in blazars. These are jetted active galactic nuclei viewed at a small angle to the line-of-sight. Only a handful of objects viewed at a larger angle are known so far to emit above 100 GeV.…

High Energy Astrophysical Phenomena · Physics 2020-01-09 M. L. Ahnen , S. Ansoldi , L. A. Antonelli , C. Arcaro , A. Babić , B. Banerjee , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , E. Bernardini , A. Berti , B. Biasuzzi , A. Biland , O. Blanch , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , R. Carosi , A. Carosi , A. Chatterjee , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , P. Cumani , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , E. de Oña Wilhelmi , F. Di Pierro , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher Glawion , D. Elsaesser , M. Engelkemeier , V. Fallah Ramazani , A. Fernández-Barral , D. Fidalgo , M. V. Fonseca , L. Font , C. Fruck , D. Galindo , R. J. García López , M. Garczarczyk , M. Gaug , P. Giammaria , N. Godinović , D. Gora , D. Guberman , D. Hadasch , A. Hahn , T. Hassan , M. Hayashida , J. Herrera , J. Hose , D. Hrupec , G. Hughes , W. Idec , K. Ishio , K. Kodani , Y. Konno , H. Kubo , J. Kushida , D. Lelas , E. Lindfors , S. Lombardi , F. Longo , M. López , P. Majumdar , M. Makariev , K. Mallot , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , U. Menzel , R. Mirzoyan , A. Moralejo , E. Moretti , D. Nakajima , V. Neustroev , A. Niedzwiecki , M. Nievas Rosillo , K. Nilsson , K. Nishijima , K. Noda , L. Nogués , M. Nöthe , S. Paiano , J. Palacio , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , G. Pedaletti , M. Peresano , L. Perri , M. Persic , J. Poutanen , P. G. Prada Moroni , E. Prandini , I. Puljak , J. R. Garcia , I. Reichardt , W. Rhode , M. Ribó , J. Rico , T. Saito , K. Satalecka , S. Schroeder , T. Schweizer , S. N. Shore , A. Sillanpää , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Stamerra , M. Strzys , T. Surić , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , D. F. Torres , N. Torres-Albà , T. Toyama , A. Treves , G. Vanzo , M. Vazquez Acosta , I. Vovk , J. E. Ward , M. Will , M. H. Wu , F. Krauß , R. Schulz , M. Kadler , J. Wilms , E. Ros , U. Bach , T. Beuchert , M. Langejahn , C. Wendel , N. Gehrels , W. H. Baumgartner , C. B. Markwardt , C. Müller , V. Grinberg , T. Hovatta , J. Magill

Multiwavelength Observations of a Dramatic High Energy Flare in the Blazar 3C 279

The blazar 3C 279, one of the brightest identified extragalactic objects in the gamma-ray sky, underwent a flare of a factor 10 amplitude in gamma-rays towards the end of a 3-week pointing by CGRO, in 1996 January-February. The flare peak…

Astrophysics · Physics 2009-10-30 A. E. Wehrle , E. Pian , C. M. Urry , L. Maraschi , G. Ghisellini , R. C. Hartman

Physics Insights from Recent MAGIC AGN Observations

The total set of the 14 active galactic nuclei detected by MAGIC so far includes well-studied bright blazars like Mkn 501, the giant radio galaxy M 87, but also the distant flat-spectrum radio quasar 3C 279, and an intriguing gamma-ray…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Robert Wagner

AGILE Observations of the Gravitational Wave Source GW170104

The LIGO/Virgo Collaboration (LVC) detected on 2017 January 4, a significant gravitational-wave (GW) event (now named GW170104). We report in this Letter the main results obtained from the analysis of hard X-ray and gamma-ray data of the…

High Energy Astrophysical Phenomena · Physics 2017-10-04 F. Verrecchia , M. Tavani , A. Ursi , A. Argan , C. Pittori , I. Donnarumma , A. Bulgarelli , F. Fuschino , C. Labanti , M. Marisaldi , Y. Evangelista , G. Minervini , A. Giuliani , M. Cardillo , F. Longo , F. Lucarelli , P. Munar-Adrover , G. Piano , M. Pilia , V. Fioretti , N. Parmiggiani , A. Trois , E. Del Monte , L. A. Antonelli , G. Barbiellini , P. Caraveo , P. W. Cattaneo , S. Colafrancesco , E. Costa , F. D'Amico , M. Feroci , A. Ferrari , A. Morselli , L. Pacciani , F. Paoletti , A. Pellizzoni , P. Picozza , A. Rappoldi , S. Vercellone

Long-term AGILE monitoring of the puzzling gamma-ray source 3EG J1835+5918

We present the AGILE gamma-ray observations of the field containing the puzzling gamma-ray source 3EG J1835+5918. This source is one of the most remarkable unidentified EGRET sources. An unprecedentedly long AGILE monitoring of this source…

Astrophysics · Physics 2009-11-13 A. Bulgarelli , M. Tavani , P. Caraveo , A. W. Chen , F. Gianotti , M. Trifoglio , M. Marelli , A. Argan , G. Barbiellini , F. Boffelli , P. W. Cattaneo , V. Cocco , E. Costa , F. D'Ammando , E. Del Monte , G. De Paris , G. Di Cocco , I. Donnarumma , Y. Evangelista , M. Feroci , M. Fiorini , T. Froysland , F. Fuschino , M. Galli , A. Giuliani , C. Labanti , I. Lapshov , F. Lazzarotto , P. Lipari , F. Longo , M. Marisaldi , S. Mereghetti , A. Morselli , L. Pacciani , A. Pellizzoni , F. Perotti , G. Piano , P. Picozza , M. Prest , G. Pucella , M. Rapisarda , A. Rappoldi , P. Soffitta , A. Trois , E. Vallazza , S. Vercellone , V. Vittorini , A. Zambra , D. Zanello , P. Giommi , C. Pittoril , F. Verrecchia , P. Santolamazza , D. Gasparrini , S. Cutini , S. Colafrancesco , L. Salotti

Identifying the 3FHL catalog: CTIO results

Active galactic Nuclei (AGNs) with their relativistic jets pointed towards the observer, form a subclass of luminous gamma-ray sources commonly known as blazars. The study of blazars is essential to improve our understanding on the AGNs…

High Energy Astrophysical Phenomena · Physics 2019-03-05 Abhishek Desai , Stefano Marchesi , Meenakshi Rajagopal , Marco Ajello

Scientific Highlights from Observations of Active Galactic Nuclei with the MAGIC Telescope

Since 2004, the MAGIC gamma-ray telescope has newly discovered 6 TeV blazars. The total set of 13 MAGIC-detected active galactic nuclei includes well-studied objects at other wavelengths like Markarian 501 and the giant radio galaxy M87,…

Astrophysics · Physics 2019-08-13 Robert Wagner

First detection of VHE gamma-ray emission from TXS~1515--273, study of its X-ray variability and spectral energy distribution

We report here on the first multi-wavelength (MWL) campaign on the blazar TXS 1515-273, undertaken in 2019 and extending from radio to very-high-energy gamma rays (VHE). Up until now, this blazar had not been the subject of any detailed MWL…

High Energy Astrophysical Phenomena · Physics 2021-07-21 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , M. Artero , K. Asano , D. Baack , A. Babić , A. Baquero , U. Barres de Almeida , J. A. Barrio , I. Batković , J. Becerra González , W. Bednarek , L. Bellizzi , E. Bernardini , M. Bernardos , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , A. Biland , O. Blanch , Ž. Bošnjak , G. Busetto , R. Carosi , G. Ceribella , M. Cerruti , Y. Chai , A. Chilingarian , S. Cikota , S. M. Colak , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , G. D'Amico , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis1 , B. De Lotto , M. Delfino , J. Delgado , C. Delgado Mendez , D. Depaoli , F. Di Pierro , L. Di Venere , E. Do Souto Espiñeira , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , V. Fallah Ramazani , A. Fattorini , G. Ferrara , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , P. Gliwny , N. Godinović , J. G. Green , D. Green , D. Hadasch , A. Hahn , L. Heckmann , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , I. Jiménez , J. Jormanainen , L. Jouvin , Y. Kajiwara , M. Karjalainen , D. Kerszberg , Y. Kobayashi , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , R. López-Coto , M. López-Moya , A. López-Oramas , S. Loporchio , B. Machado de Oliveira Fraga , C. Maggio , P. Majumdar , M. Makariev , M. Mallamaci , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , S. Menchiari , S. Mender , S. Mićanović , D. Miceli , T. Miener , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , V. Neustroev , C. Nigro , K. Nilsson , K. Nishijima , K. Noda , S. Nozaki , Y. Ohtani , T. Oka , J. Otero-Santos , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , L. Pavletić , P. Peñi , C. Perennes , M. Persic , P. G. Prada Moroni , E. Prandini , C. Priyadarshi , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , F. G. Saturni , B. Schleicher , K. Schmidt , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Spolon , A. Stamerra , D. Strom , M. Strzys , Y. Suda , T. Surić , M. Takahashi , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , L. Tosti , S. Truzzi , A. Tutone , S. Ubach , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , S. Ventura , V. Verguilov , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , C. Wunderlich , D. Zaric , E. Bissaldi , G. Bonnoli , S. Cutini , F. D'Ammando , A. Nabizadeh , A. Marchini , M. Orienti

AGILE Observations of Terrestrial Gamma-Ray Flashes

The AGILE satellite, operating since mid 2007 and primarily devoted to high-energy astrophysics, is one of the only three currently operating space instruments capable of detecting Terrestrial Gamma-Ray Flashes (TGFs), together with RHESSI…

High Energy Astrophysical Phenomena · Physics 2022-03-02 M. Marisaldi , F. Fuschino , C. Labanti , A. Bulgarelli , F. Gianotti , M. Trifoglio , M. Tavani , A. Argan , E. Del Monte , F. Longo , G. Barbiellini , A. Giuliani , A. Trois

COMPTEL Observations of the Gamma-ray Blazars 3C~454.3 and CTA 102 During the CGRO Mission

We have investigated the MeV behaviour of the \gray blazars 3C~454.3 and CTA 102 by analyzing all COMPTEL observations of this sky region during the complete CGRO mission. Both sources are detected by COMPTEL at the upper COMPTEL energies;…

Astrophysics · Physics 2009-11-11 S. Zhang , W. Collmar , V. Schonfelder

The gamma-ray source AGL J2241+4454 as the possible counterpart of MWC 656

The AGILE satellite discovered the transient source AGL J2241+4454 in 2010 which triggered the study of the associated field allowing for the discovery of the first Be/black hole binary system: MWC 656. This binary was suggested to be the…

High Energy Astrophysical Phenomena · Physics 2016-10-05 P. Munar-Adrover , S. Sabatini , G. Piano , M. Tavani , L. H. Nguyen , F. Lucarelli , F. Verrecchia , C. Pittori

Active Galaxies Studied with the H.E.S.S. Observatory

X-ray selected BL Lac objects dominate the population of extragalactic sources detected in the very high energy (VHE; photon energies >100GeV) gamma-ray regime with ground-based Cherenkov Telescopes. These are not the only extragalactic VHE…

High Energy Astrophysical Phenomena · Physics 2019-08-14 L. Stawarz