Related papers: M87 as a misaligned Synchrotron-Proton Blazar

Spine-sheath layer radiative interplay in subparsec-scale jets and the TeV emission from M87

Simple one-zone homogeneous synchrotron self-Compton models have severe difficulties in explaining the TeV emission observed in the radiogalaxy M87. Also the site of the TeV emission region is uncertain: it could be the unresolved jet close…

Astrophysics · Physics 2009-11-13 F. Tavecchio , G. Ghisellini

Fast TeV variability from misaligned minijets in the jet of M87

The jet of the radio galaxy M87 is misaligned, resulting in a Doppler factor delta~1 for emission of plasma moving parallel to the jet. This makes the observed fast TeV flares on timescales of t_v~5R_g/c harder to understand as emission…

High Energy Astrophysical Phenomena · Physics 2015-05-13 Dimitrios Giannios , Dmitri A. Uzdensky , Mitchell C. Begelman

A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012

The nearby radio galaxy M87 offers a unique opportunity for exploring the connection between gamma-ray production and jet formation at an unprecedented linear resolution. However, the origin and location of the gamma-rays in this source is…

High Energy Astrophysical Phenomena · Physics 2015-06-23 K. Hada , M. Giroletti , M. Kino , G. Giovannini , F. D'Ammando , C. C. Cheung , M. Beilicke , H. Nagai , A. Doi , K. Akiyama , M. Honma , K. Niinuma , C. Casadio , M. Orienti , H. Krawczynski , J. L. Gomez , S. Sawada-Satoh , S. Koyama , A. Cesarini , S. Nakahara , M. A. Gurwell

A strong radio brightening at the jet base of M87 in the period of the elevated TeV gamma-ray state in 2012

The nearby radio galaxy M87 offers a unique opportunity for exploring the connection between gamma-ray production and jet formation at an unprecedented linear resolution. However, the origin and location of the gamma-rays in this source is…

High Energy Astrophysical Phenomena · Physics 2015-02-19 K. Hada , M. Giroletti , M. Kino , G. Giovannini , F. D'Ammando , C. C. Cheung , M. Beilicke , H. Nagai , A. Doi , K. Akiyama , M. Honma , K. Niinuma , C. Casadio , M. Orienti , H. Krawczynski , J. L. Gomez , S. Sawada-Satoh , S. Koyama , A. Cesarini , S. Nakahara , M. A. Gurwell

Observation of the giant radio galaxy M87 at TeV energies with H.E.S.S

The giant radio galaxy M 87 was observed at TeV energies with the Cherenkov telescopes of the H.E.S.S. collaboration (High Energy Stereoscopic System). The observations have been performed in the year 2003 during the comissioning phase and…

Astrophysics · Physics 2019-08-15 M. Beilicke , W. Benbow , R. Cornils , G. Heinzelmann , D. Horns , M. Raue , J. Ripken , M. Tluczykont

VERITAS observations of M87 from 2007 to present

M87 is a nearby radio galaxy and because of its misaligned jet, it is possible to correlate detailed spatially-resolved emission regions in the radio, optical to X-ray waveband with unresolved but contemporaneous flux measurements in the…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 C. M. Hui

Probing the Cosmic Ray Population of the Giant Elliptical Galaxy M 87 with Observed TeV Gamma-Rays

We examine the cosmic ray proton (CRp) population within the giant elliptical galaxy M 87 using the TeV gamma-ray detection of the HEGRA collaboration. In our scenario, the gamma-rays are produced by decaying pions which result from…

Astrophysics · Physics 2009-11-07 Christoph Pfrommer , Torsten A. Ensslin

Superluminal Radio Features in the M87 Jet and the Site of Flaring TeV Gamma-ray Emission

Superluminal motion is a common feature of radio jets in powerful gamma-ray emitting active galactic nuclei. Conventionally, the variable emission is assumed to originate near the central supermassive black-hole where the jet is launched on…

Astrophysics · Physics 2009-11-13 C. C. Cheung , D. E. Harris , L. Stawarz

An RXTE study of M87 and the core of the Virgo cluster

We present hard X-ray observations of the nearby radio galaxy M87 and the core of the Virgo cluster using the Rossi X-ray Timing Explorer. These are the first hard X-ray observations of M87 not affected by contamination from the nearby…

Astrophysics · Physics 2015-09-16 C. S. Reynolds , S. Heinz , A. C. Fabian , M. C. Begelman

Observation of radio galaxies with HAWC

The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory is an extensive air shower array located in Puebla, Mexico. The closest radio galaxy within the HAWC field of view, M87, has been detected in very high energies. In this work we…

High Energy Astrophysical Phenomena · Physics 2019-08-15 Daniel Avila Rojas , Rubén Alfaro , Antonio Galván , María Magdalena González , Nissim Fraija , Marc Klinger

A first joint M87 campaign in 2008 from radio to TeV gamma-rays

M87, the central galaxy of the Virgo cluster, is the first radio galaxy detected in the TeV regime. The structure of its jet, which is not pointing toward the line of sight, is spatially resolved in X-ray (by Chandra), in optical and in…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-15 R. M. Wagner , M. Beilicke , F. Davies , H. Krawczynski , D. Mazin , M. Raue , S. Wagner , R. C. Walker

The complex gamma-ray behaviour of the Radio Galaxy M87

Context.In recent years, non-blazar Active Galactic Nuclei (AGN) such as Radio Galaxies have emerged as a highly instructive source class providing unique insights into high energy acceleration and radiation mechanisms. Aims.Here we aim at…

High Energy Astrophysical Phenomena · Physics 2019-02-27 Faiçal Ait Benkhali , Nachiketa Chakraborty , Frank M. Rieger

VERITAS Observations of M 87 in 2011/2012

The giant radio galaxy M 87 is located at a distance of 16.7 Mpc and harbors a super-massive black hole (6 billion solar masses) in its center. M 87 is one of just three radio galaxies known to emit TeV gamma-rays. The structure of its…

High Energy Astrophysical Phenomena · Physics 2015-06-11 M. Beilicke , the VERITAS Collaboration

The strong flaring activity of M87 in early 2008 as observed by the MAGIC telescope

M87 is the first known radio galaxy to emit very high energy (VHE) gamma-rays. During a monitoring program of M87, a rapid flare in VHE gamma-rays was detected by the MAGIC telescope in early 2008. The flux was found to be variable on a…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 D. Tescaro , D. Mazin , R. M. Wagner , K. Berger , N. Galante

Detection of very high-energy gamma-ray emission from the radio galaxy M87 with LHAASO

The nearby radio galaxy M87 is a very-high-energy (VHE) gamma-ray emitter established by observations with ground-based gamma-ray detectors. Here we report the long-term monitoring of M87 from 2021 to 2024 with Large High Altitude Air…

High Energy Astrophysical Phenomena · Physics 2025-12-29 Zhen Cao , F. Aharonian , Axikegu , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , A. V. Bukevich , Q. Cao , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , A. M. Chen , E. S. Chen , H. X. Chen , Liang Chen , Lin Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , Y. Chen , N. Cheng , Y. D. Cheng , M. C. Chu , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , C. D. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , Y. He , Y. K. Hor , B. W. Hou , C. Hou , X. Hou , H. B. Hu , Q. Hu , S. C. Hu , C. Huang , D. H. Huang , T. Q. Huang , W. J. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , B. B. Li , C. M. Li , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , S. D. Li , W. L. Li , W. L. Li , X. R. Li , Xin Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , Y. Liu , Y. N. Liu , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , Z. Min , W. Mitthumsiri , H. J. Mu , Y. C. Nan , A. Neronov , K. C. Y. Ng , L. J. Ou , P. Pattarakijwanich , Z. Y. Pei , J. C. Qi , M. Y. Qi , B. Q. Qiao , J. J. Qin , A. Raza , D. Ruffolo , A. Sáiz , M. Saeed , D. Semikoz , L. Shao , O. Shchegolev , X. D. Sheng , F. W. Shu , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , D. X. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , J. Takata , P. H. T. Tam , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , L. H. Wan , C. Wang , C. B. Wang , G. W. Wang , H. G. Wang , H. H. Wang , J. C. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , P. H. Wang , R. Wang , W. Wang , X. G. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Y. J. Wang , Z. H. Wang , Z. X. Wang , Zhen Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. L. Xin , Y. Xing , D. R. Xiong , Z. Xiong , D. L. Xu , R. F. Xu , R. X. Xu , W. L. Xu , L. Xue , D. H. Yan , J. Z. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Y. H. Yao , Z. G. Yao , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , M. Zha , B. B. Zhang , F. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , Li Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. B. Zhang , S. R. Zhang , S. S. Zhang , X. Zhang , X. P. Zhang , Y. F. Zhang , Yi Zhang , Yong Zhang , B. Zhao , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , F. Zheng , W. J. Zhong , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo

Monitoring the radio galaxy M87 with HAWC

Studies of radio galaxies at TeV energies are fascinating because their jets are misaligned concerning our sightline. Thus, it provides us with a unique opportunity to study the structure of their jets, the radiative processes, and the…

High Energy Astrophysical Phenomena · Physics 2022-09-21 T. Capistrán , D. Avila Rojas , M. M. González , N. Fraija , R. Alfaro

Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC

M87 is one of the closest (z=0.00436) extragalactic sources emitting at very-high-energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emission and to describe the observed broadband spectral energy…

High Energy Astrophysical Phenomena · Physics 2020-08-04 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , C. Arcaro , D. Baack , A. Babić , B. Banerjee , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , L. Bellizzi , E. Bernardini , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , A. Biland , O. Blanch , G. Bonnoli , Ž. Bošnjak , G. Busetto , R. Carosi , G. Ceribella , Y. Chai , A. Chilingaryan , S. Cikota , S. M. Colak , U. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , M. Delfino , J. Delgado , 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 , A. Fernández-Barral , G. Ferrara , D. Fidalgo , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , N. Godinović , D. Green , D. Guberman , D. Hadasch , A. Hahn , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , L. Jouvin , D. Kerszberg , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , 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 , S. Masuda , D. Mazin , S. Mićanović , D. Miceli , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , P. Munar-Adrover , V. Neustroev , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , L. Nogués , M. Nöthe , S. Nozaki , S. Paiano , J. Palacio , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , P. Peñil , M. Peresano , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , K. Schmidt , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Somero , A. Stamerra , D. Strom , M. Strzys , Y. Suda , T. Surić , M. Takahashi , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albà , L. Tosti , S. Tsujimoto , V. Vagelli , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , D. Zarić , MWL Collaborators , : , K. Asano , K. Hada , D. E. Harris , M. Giroletti , H. E. Jermak , J. P. Madrid , F. Massaro , S. Richter , F. Spanier , I. A. Steele , R. C. Walker

M87 at metre wavelengths: the LOFAR picture

M87 is a giant elliptical galaxy located in the centre of the Virgo cluster, which harbours a supermassive black hole of mass 6.4x10^9 M_sun, whose activity is responsible for the extended (80 kpc) radio lobes that surround the galaxy. The…

Astrophysics of Galaxies · Physics 2015-06-11 F. de Gasperin , E. Orru' , M. Murgia , A. Merloni , H. Falcke , R. Beck , R. Beswick , L. Birzan , A. Bonafede , M. Bruggen , G. Brunetti , K. Chyzy , J. Conway , J. H. Croston , T. Ensslin , C. Ferrari , G. Heald , S. Heidenreich , N. Jackson , G. Macario , J. McKean , G. Miley , R. Morganti , A. Offringa , R. Pizzo , D. Rafferty , H. Roettgering , A. Shulevski , M. Steinmetz , C. Tasse , S. van der Tol , W. van Driel , R. J. van Weeren , J. E. van Zwieten , A. Alexov , J. Anderson , A. Asgekar , M. Avruch , M. Bell , M. R. Bell , M. Bentum , G. Bernardi , P. Best , F. Breitling , J. W. Broderick , A. Butcher , B. Ciardi , R. J. Dettmar , J. Eisloeffel , W. Frieswijk , H. Gankema , M. Garrett , M. Gerbers , J. M. Griessmeier , A. W. Gunst , T. E. Hassall , J. Hessels , M. Hoeft , A. Horneffer , A. Karastergiou , J. Koehler , Y. Koopman , G. Kuper , P. Maat , G. Mann , M. Mevius , D. D. Mulcahy , H. Munk , R. Nijboer , M. Kuniyoshi , J. Noordam , H. Paas , M. Pandey , V. N. Pandey , A. Polatidis , W. Reich , A. . P. Schoenmakers , J. Sluman , O. Smirnov , C. Sobey , B. Stappers , J. Swinbank , M. Tagger , Y. Tang , I. van Bemmel , W. van Cappellen , A. P. van Duin , M. van Haarlem , J. van Leeuwen , R. Vermeulen , C. Vocks , S. White , M. Wise , O. Wucknitz , P. Zarka

Multiwavelength modeling of TeV AGN observed by HESS

The High Energy Stereoscopic System (H.E.S.S.) experiment, a ground-based gamma-ray Cherenkov telescope array located in Namibia, has now detected many extragalactic objects, which redshifts range from z=0.00183 up to z=0.2, possibly more.…

Astrophysics · Physics 2007-09-12 Jean-Philippe Lenain

Fast variability of TeV gamma-rays from the radio galaxy M 87

The detection of fast variations of the TeV (10^12 eV) gamma-ray flux, on time-scales of days, from the nearby radio galaxy M 87 is reported. These variations are ~10 times faster than that observed in any other waveband and imply a very…

Astrophysics · Physics 2008-11-26 HESS Collaboration , F. A. Aharonian