A
A. Cesarini
Researcher at University of Urbino
Publications - 172
Citations - 9714
A. Cesarini is an academic researcher from University of Urbino. The author has contributed to research in topics: Blazar & Crab Nebula. The author has an hindex of 56, co-authored 166 publications receiving 8735 citations. Previous affiliations of A. Cesarini include Harvard University & University of Trento.
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Journal ArticleDOI
Sub-Femto-g Free Fall for Space-Based Gravitational Wave Observatories: LISA Pathfinder Results
Michele Armano,Heather Audley,G. Auger,J. Baird,Massimo Bassan,Pierre Binétruy,M. Born,Daniele Bortoluzzi,N. Brandt,M. Caleno,L. Carbone,Antonella Cavalleri,A. Cesarini,Giacomo Ciani,G. Congedo,A. M. Cruise,Karsten Danzmann,M. de Deus Silva,R. De Rosa,M. Diaz-Aguilo,L. Di Fiore,Ingo Diepholz,G. Dixon,Rita Dolesi,N. Dunbar,Luigi Ferraioli,Valerio Ferroni,Walter Fichter,E. D. Fitzsimons,R. Flatscher,M. Freschi,A. F. García Marín,C. García Marirrodriga,R. Gerndt,Lluis Gesa,Ferran Gibert,Domenico Giardini,R. Giusteri,F. Guzmán,Aniello Grado,Catia Grimani,A. Grynagier,J. Grzymisch,I. Harrison,Gerhard Heinzel,M. Hewitson,Daniel Hollington,D. Hoyland,Mauro Hueller,Henri Inchauspe,Oliver Jennrich,Ph. Jetzer,Ulrich Johann,B. Johlander,Nikolaos Karnesis,B. Kaune,N. Korsakova,Christian J. Killow,J. A. Lobo,Ivan Lloro,L. Liu,J. P. López-Zaragoza,R. Maarschalkerweerd,Davor Mance,V. Martín,L. Martin-Polo,J. Martino,F. Martin-Porqueras,S. Madden,Ignacio Mateos,Paul McNamara,José F. F. Mendes,L. Mendes,A. Monsky,Daniele Nicolodi,Miquel Nofrarías,S. Paczkowski,Michael Perreur-Lloyd,Antoine Petiteau,P. Pivato,Eric Plagnol,P. Prat,U. Ragnit,B. Rais,Juan Ramos-Castro,J. Reiche,D. I. Robertson,H. Rozemeijer,F. Rivas,G. Russano,J Sanjuán,P. Sarra,A. Schleicher,D. Shaul,Jacob Slutsky,Carlos F. Sopuerta,Ruggero Stanga,F. Steier,T. J. Sumner,D. Texier,James Ira Thorpe,C. Trenkel,Michael Tröbs,H. B. Tu,Daniele Vetrugno,Stefano Vitale,V Wand,Gudrun Wanner,H. Ward,C. Warren,Peter Wass,D. Wealthy,W. J. Weber,L. Wissel,A. Wittchen,A. Zambotti,C. Zanoni,Tobias Ziegler,Peter Zweifel +118 more
TL;DR: The first results of the LISA Pathfinder in-flight experiment demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with a relative acceleration noise with a square root of the power spectral density.
Journal ArticleDOI
Fermi Large Area Telescope Observations of Markarian 421: The Missing Piece of its Spectral Energy Distribution
A. A. Abdo,A. A. Abdo,Markus Ackermann,Marco Ajello,Luca Baldini,Jean Ballet,Guido Barbiellini,Guido Barbiellini,Denis Bastieri,Denis Bastieri,Keith Bechtol,Ronaldo Bellazzini,B. Berenji,Roger Blandford,E. D. Bloom,Emanuele Bonamente,Emanuele Bonamente,A. W. Borgland,A. Bouvier,J. Bregeon,Alessandro Brez,M. Brigida,M. Brigida,P. Bruel,R. Buehler,S. Buson,S. Buson,G. A. Caliandro,R. A. Cameron,A. Cannon,A. Cannon,P. A. Caraveo,S. Carrigan,J. M. Casandjian,E. Cavazzuti,Claudia Cecchi,Claudia Cecchi,Omer Celik,Omer Celik,Eric Charles,A. Chekhtman,A. Chekhtman,James Chiang,Stefano Ciprini,R. Claus,Johann Cohen-Tanugi,Jan Conrad,Jan Conrad,S. Cutini,A. De Angelis,F. de Palma,F. de Palma,Charles D. Dermer,E. Do Couto E Silva,Persis S. Drell,R. Dubois,D. Dumora,L. Escande,L. Escande,C. Favuzzi,C. Favuzzi,Stephen Fegan,Justin D. Finke,W. B. Focke,P. Fortin,M. Frailis,Lars Fuhrmann,Yasushi Fukazawa,T. Fukuyama,Stefan Funk,P. Fusco,P. Fusco,F. Gargano,Dario Gasparrini,N. Gehrels,Markos Georganopoulos,S. Germani,S. Germani,B. Giebels,Nicola Giglietto,Nicola Giglietto,Paolo Giommi,Francesco Giordano,Francesco Giordano,Marcello Giroletti,T. Glanzman,G. Godfrey,I. A. Grenier,Sylvain Guiriec,Daniela Hadasch,M. Hayashida,E. Hays,D. Horan,R. E. Hughes,Gudlaugur Johannesson,A. S. Johnson,W. N. Johnson,Matthias Kadler,T. Kamae,Hideaki Katagiri,Jun Kataoka,Jürgen Knödlseder,M. Kuss,J. Lande,Luca Latronico,Shiu-Hang Lee,Francesco Longo,Francesco Longo,F. Loparco,F. Loparco,Benoit Lott,M. N. Lovellette,P. Lubrano,P. Lubrano,G. M. Madejski,A. Makeev,A. Makeev,Walter Max-Moerbeck,M. N. Mazziotta,Julie McEnery,Julie McEnery,J. Mehault,Peter F. Michelson,W. Mitthumsiri,Tsunefumi Mizuno,C. Monte,C. Monte,M. E. Monzani,A. Morselli,Igor V. Moskalenko,S. Murgia,Takeshi Nakamori,M. Naumann-Godo,Sho Nishino,P. L. Nolan,J. P. Norris,E. Nuss,T. Ohsugi,Atsushi Okumura,Nicola Omodei,E. Orlando,J. F. Ormes,M. Ozaki,David Paneque,David Paneque,J. H. Panetta,D. Parent,D. Parent,Vasiliki Pavlidou,T. J. Pearson,V. Pelassa,M. Pepe,M. Pepe,Melissa Pesce-Rollins,M. Pierbattista,F. Piron,T. A. Porter,S. Rainò,S. Rainò,Riccardo Rando,Riccardo Rando,M. Razzano,Anthony C. S. Readhead,A. Reimer,Olaf Reimer,L. C. Reyes,Joseph L. Richards,Steven Ritz,M. Roth,Hartmut Sadrozinski,David Sanchez,A. Sander,Carmelo Sgrò,E. J. Siskind,P. D. Smith,Gloria Spandre,P. Spinelli,P. Spinelli,Łukasz Stawarz,Mark Stevenson,M. S. Strickman,D. J. Suson,Hiromitsu Takahashi,Tadayuki Takahashi,Takaaki Tanaka,J. G. Thayer,J. B. Thayer,D. J. Thompson,L. Tibaldo,Diego F. Torres,Diego F. Torres,Gino Tosti,Gino Tosti,A. Tramacere,Eleonora Troja,T. L. Usher,Justin Vandenbroucke,V. Vasileiou,V. Vasileiou,Giacomo Vianello,N. Vilchez,V. Vitale,V. Vitale,A. P. Waite,P. Wang,Ann E. Wehrle,Brian L Winer,K. S. Wood,Zhenwei Yang,Y. Yatsu,T. Ylinen,T. Ylinen,J. A. Zensus,M. Ziegler,Jelena Aleksić,L. A. Antonelli,P. Antoranz,Michael Backes,Juan Abel Barrio,J. Becerra González,J. Becerra González,W. Bednarek,Andrei Berdyugin,K. Berger,Elisa Bernardini,Adrian Biland,Oscar Blanch,R. K. Bock,A. Boller,G. Bonnoli,Pol Bordas,D. Borla Tridon,Valentí Bosch-Ramon,D. Bose,Ilana M. Braun,Thomas Bretz,M. Camara,E. Carmona,Alessandro Carosi,Pierre Colin,E. Colombo,Jose Luis Contreras,Juan Cortina,Stefano Covino,Francesco Dazzi,E. De Cea del Pozo,C. Delgado Mendez,B. De Lotto,M. De Maria,F. De Sabata,A. Diago Ortega,A. Diago Ortega,M. Doert,Aaron Dominguez,D. Dominis Prester,Daniela Dorner,Michele Doro,Michele Doro,Dominik Elsaesser,Daniel Ferenc,M. V. Fonseca,Ll. Font,R. J. García López,R. J. García López,M. Garczarczyk,Markus Gaug,Gianluca Giavitto,N. Godinovi,Artemio Herrero,Artemio Herrero,D. Hildebrand,D. Höhne-Mönch,J. Hose,Dario Hrupec,T. Jogler,S. Klepser,T. Krähenbühl,D. Kranich,J. Krause,A. La Barbera,E. Leonardo,Elina Lindfors,Saverio Lombardi,Saverio Lombardi,M. López,M. López,E. Lorenz,E. Lorenz,P. Majumdar,E. Makariev,G. Maneva,N. Mankuzhiyil,K. Mannheim,L. Maraschi,Mosè Mariotti,Mosè Mariotti,M. I. Martínez,Daniel Mazin,Mario Meucci,Jose Miguel Miranda,R. Mirzoyan,Hiroko Miyamoto,J. Moldón,Abelardo Moralejo,Daniel Nieto,K. Nilsson,Reiko Orito,I. Oya,Riccardo Paoletti,Josep M. Paredes,S. Partini,M. Pasanen,F. Pauss,R. Pegna,Miguel A. Pérez-Torres,Massimo Persic,Massimo Persic,J. Peruzzo,J. Peruzzo,J. Pochon,Francisco Prada,P. G. Prada Moroni,Elisa Prandini,Elisa Prandini,N. Puchades,Ivica Puljak,T. Reichardt,Wolfgang Rhode,Marc Ribó,J. Rico,J. Rico,M. Rissi,S. Rügamer,A. Saggion,A. Saggion,K. Saito,Takashi Saito,M. Salvati,Miguel A. Sánchez-Conde,Miguel A. Sánchez-Conde,Konstancja Satalecka,V. Scalzotto,V. Scalzotto,V. Scapin,C. Schultz,C. Schultz,T. Schweizer,M. Shayduk,S. N. Shore,S. N. Shore,Agnieszka Sierpowska-Bartosik,A. Sillanpää,Julian Sitarek,Dorota Sobczyńska,Felix Spanier,S. Spiro,Antonio Stamerra,B. Steinke,J. Storz,N. Strah,J. C. Struebig,Tihomir Surić,L. O. Takalo,Fabrizio Tavecchio,Petar Temnikov,Tomislav Terzić,D. Tescaro,Masahiro Teshima,H. Vankov,Robert Wagner,Q. Weitzel,Victor Zabalza,Fabio Zandanel,R. Zanin,M. Villata,C. M. Raiteri,Hugh D. Aller,M. F. Aller,Wen Ping Chen,B. Jordan,Ekaterina Koptelova,Omar M. Kurtanidze,Anne Lähteenmäki,B. McBreen,Valeri M. Larionov,Valeri M. Larionov,Valeri M. Larionov,C. S. Lin,M. G. Nikolashvili,R. Reinthal,Emmanouil Angelakis,M. Capalbi,A. Carraminana,L. Carrasco,P. Cassaro,A. Cesarini,A. D. Falcone,Mark Gurwell,Talvikki Hovatta,Yu. A. Kovalev,Yuri Y. Kovalev,Yuri Y. Kovalev,Thomas P. Krichbaum,Hans A. Krimm,Hans A. Krimm,Matthew L. Lister,Joseph Moody,G. Maccaferri,Y. Mori,I. Nestoras,Andrea Orlati,C. Pace,C. Pagani,R. Pearson,M. Perri,B. G. Piner,Eduardo Ros,Eduardo Ros,A. C. Sadun,T. Sakamoto,Joni Tammi,A. C. Zook +421 more
TL;DR: In this paper, the gamma-ray activity of the high-synchrotron-peaked BL Lacertae object Markarian 421 (Mrk 421) during the first 1.5 years of Fermi operation was reported.
Journal ArticleDOI
A connection between star formation activity and cosmic rays in the starburst galaxy M82
V. A. Acciari,V. A. Acciari,V. A. Acciari,E. Aliu,T. C. Arlen,T. Aune,Manuel A. Bautista,M. Beilicke,Wystan Benbow,D. Boltuch,S. M. Bradbury,J. H. Buckley,V. Bugaev,Karen Byrum,A. Cannon,O. Celik,A. Cesarini,Y. C. Chow,L. Ciupik,P. Cogan,Pierre Colin,Wei Cui,R. Dickherber,C. Duke,S. J. Fegan,J. P. Finley,G. Finnegan,P. Fortin,Lucy Fortson,Amy Furniss,N. Galante,Daniel Gall,K. G. Gibbs,G. H. Gillanders,S. Godambe,J. Grube,R. Guenette,Geza Gyuk,D. S. Hanna,Jamie Holder,D. Horan,C. M. Hui,Thomas Brian Humensky,A. Imran,Philip Kaaret,N. Karlsson,M. Kertzman,David Kieda,John Kildea,A. Konopelko,Henric Krawczynski,Frank Krennrich,M. J. Lang,S. LeBohec,Gernot Maier,S. McArthur,A. McCann,M. McCutcheon,J. Millis,P. Moriarty,Reshmi Mukherjee,T. Nagai,R. A. Ong,A. N. Otte,D. Pandel,J. S. Perkins,F. Pizlo,Martin Pohl,John L. Quinn,K. Ragan,L. C. Reyes,P. T. Reynolds,E. Roache,H. J. Rose,M. Schroedter,G. H. Sembroski,A. W. Smith,D. Steele,S. P. Swordy,M. Theiling,S. Thibadeau,A. Varlotta,Vladimir Vassiliev,S. Vincent,R. G. Wagner,S. P. Wakely,J. E. Ward,T. C. Weekes,Amanda Weinstein,T. Weisgarber,David A. Williams,Stephanie Wissel,Matthew Wood,B. Zitzer +93 more
TL;DR: A cosmic-ray density of 250 eV cm-3 in the starburst core, which is about 500 times the average Galactic density is determined, and suggests that supernovae and massive-star winds are the dominant accelerators.
Journal ArticleDOI
Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20 μHz.
Michele Armano,Heather Audley,J. Baird,Pierre Binétruy,M. Born,Daniele Bortoluzzi,E. Castelli,Antonella Cavalleri,A. Cesarini,A. M. Cruise,Karsten Danzmann,M. de Deus Silva,Ingo Diepholz,G. Dixon,Rita Dolesi,Luigi Ferraioli,Valerio Ferroni,E. D. Fitzsimons,M. Freschi,Lluis Gesa,Ferran Gibert,Domenico Giardini,R. Giusteri,Catia Grimani,J. Grzymisch,I. Harrison,Gerhard Heinzel,M. Hewitson,Daniel Hollington,D. Hoyland,Mauro Hueller,Henri Inchauspe,Oliver Jennrich,Ph. Jetzer,Nikolaos Karnesis,B. Kaune,N. Korsakova,Christian J. Killow,J. A. Lobo,Ivan Lloro,L. Liu,J. P. López-Zaragoza,R. Maarschalkerweerd,Davor Mance,N. Meshksar,V. Martín,L. Martin-Polo,J. Martino,F. Martin-Porqueras,Ignacio Mateos,Paul McNamara,José F. F. Mendes,L. Mendes,Miquel Nofrarías,S. Paczkowski,Michael Perreur-Lloyd,Antoine Petiteau,P. Pivato,Eric Plagnol,Juan Ramos-Castro,J. Reiche,D. I. Robertson,F. Rivas,G. Russano,Jacob Slutsky,Carlos F. Sopuerta,T. J. Sumner,D. Texier,James Ira Thorpe,Daniele Vetrugno,Salvatore Vitale,Gudrun Wanner,H. Ward,Peter Wass,Peter Wass,W. J. Weber,L. Wissel,A. Wittchen,Peter Zweifel +78 more
TL;DR: This performance provides an experimental benchmark demonstrating the ability to realize the low-frequency science potential of the LISA mission, recently selected by the European Space Agency.
Journal ArticleDOI
Radio Imaging of the Very-High-Energy gamma-Ray Emission Region in the Central Engine of a Radio Galaxy
V. A. Acciari,E. Aliu,T. C. Arlen,Manuel A. Bautista,M. Beilicke,Wystan Benbow,S. M. Bradbury,J. H. Buckley,V. Bugaev,Yousaf M. Butt,Karen Byrum,A. Cannon,O. Celik,A. Cesarini,Y. C. Chow,L. Ciupik,P. Cogan,Wei Cui,R. Dickherber,S. J. Fegan,J. P. Finley,P. Fortin,Lucy Fortson,Amy Furniss,Daniel Gall,G. H. Gillanders,J. Grube,R. Guenette,Geza Gyuk,D. S. Hanna,Jamie Holder,D. Horan,C. M. Hui,Thomas Brian Humensky,A. Imran,P. Kaaret,N. Karlsson,David Kieda,John Kildea,A. Konopelko,Henric Krawczynski,Frank Krennrich,M. J. Lang,S. LeBohec,Gernot Maier,A. McCann,M. McCutcheon,J. Millis,P. Moriarty,R. A. Ong,A. N. Otte,D. Pandel,J. S. Perkins,D. Petry,Martin Pohl,John L. Quinn,K. Ragan,Luis C. Reyes,P. T. Reynolds,E. Roache,H. J. Rose,M. Schroedter,G. H. Sembroski,A. W. Smith,S. P. Swordy,M. Theiling,John Toner,A. Varlotta,S. Vincent,S. P. Wakely,J. E. Ward,T. C. Weekes,Amanda Weinstein,D. A. Williams,Stephanie Wissel,Matthew Wood,R. C. Walker,F. Davies,P. E. Hardee,W. Junor,C. Ly,Felix Aharonian,A. G. Akhperjanian,Gisela Anton,Almeida U. Barres De,A. R. Bazer-Bachi,Yvonne Becherini,B. Behera,K. Bernloehr,A. Bochow,C. Boisson,J. Bolmont,V. Borrel,J. Brucker,F. Brun,Pierre Brun,R. Buehler,T. Bulik,I. Buesching,Timothé Boutelier,P. M. Chadwick,A. Charbonnier,R. C. G. Chaves,A. Cheesebrough,L.-M. Chounet,A. C. Clapson,G. Coignet,M. Dalton,M. K. Daniel,I.D. Davids,B. Degrange,Christoph Deil,Hugh Dickinson,A. Djannati-Ataï,W. Domainko,L. O'c. Drury,Franky Dubois,Guillaume Dubus,J. Dyks,Michal Dyrda,K. Egberts,Dimitrios Emmanoulopoulos,P. Espigat,Christian Farnier,F. Feinstein,A. Fiasson,A. Foerster,G. Fontaine,M. Fuessling,Stefano Gabici,Y. A. Gallant,L. Gérard,D. Gerbig,B. Giebels,J. F. Glicenstein,B. Glueck,P. Goret,D. Goehring,D. Hauser,M. Hauser,S. Heinz,G. Heinzelmann,Gilles Henri,G. Hermann,Jim Hinton,A. Hoffmann,Werner Hofmann,M. Holleran,S. Hoppe,Dieter Horns,A. Jacholkowska,Jager O. C. de,C. Jahn,I. Jung,K. Katarzyński,U. F. Katz,Sarah Kaufmann,Eckhard Kendziorra,M. Kerschhaggl,D. Khangulyan,B. Khélifi,D. Keogh,W. Kluzniak,T. Kneiske,Nu. Komin,K. Kosack,G. Lamanna,J.-P. Lenain,Thomas Lohse,V. Marandon,J. M. Martin,Olivier Martineau-Huynh,Alexandre Marcowith,David Maurin,T. J. L. McComb,M. C. Medina,Rafał Moderski,Emmanuel Moulin,M. Naumann-Godo,Naurois M. De,D. Nedbal,D. Nekrassov,B. Nicholas,Jacek Niemiec,S. J. Nolan,Stefan Ohm,J-F. Olive,E. de Oña Wilhelmi,K. J. Orford,Michał Ostrowski,M. Panter,M. Paz Arribas,G. Pedaletti,G. Pelletier,P.-O. Petrucci,S. Pita,Michael Punch,M. Raue,S. M. Rayner,M. Renaud,Frank M. Rieger,J. Ripken,L. Rob,S. Rosier-Lees,Gavin Rowell,B. Rudak,Cameron B Rulten,J. Ruppel,V. Sahakian,Andrea Santangelo,Reinhard Schlickeiser,F. M. Schoeck,R. Schroeder,Ullrich Schwanke,S. Schwarzburg,S. Schwemmer,A. Shalchi,M. Sikora,J. L. Skilton,Helene Sol,D. Spangler,Lukasz Stawarz,R. Steenkamp,C. Stegmann,F. Stinzing,G. Superina,Anna Szostek,P. H. Tam,J.-P. Tavernet,Regis Terrier,O. Tibolla,O. Tibolla,M. Tluczykont,Eldik C. Van,G. Vasileiadis,Christo Venter,L. Venter,J. P. Vialle,Pascal Vincent,M. Vivier,H. J. Voelk,F. Volpe,Stefan Wagner,Martin Ward,Andrzej A. Zdziarski,A. Zech,H. Anderhub,L. A. Antonelli,P. Antoranz,Michael Backes,C. Baixeras,S. Balestra,Juan Abel Barrio,Denis Bastieri,J. Becerra Gonzlez,J. K. Becker,W. Bednarek,K. Berger,Elisa Bernardini,Adrian Biland,Ralph Bock,Giacomo Bonnoli,Pol Bordas,D. Borla Tridon,Valentí Bosch-Ramon,D. Bose,Ilana M. Braun,Thomas Bretz,I. Britvitch,M. Camara,E. Carmona,S. Commichau,Jose Luis Contreras,Juan Cortina,M. T. Costado,Stefano Covino,V. Curtef,Francesco Dazzi,Angelis A. De,Pozo E. de Cea Del,C. Delgado Mendez,Los Reyes R. De,Lotto B. De,Maria M. De,Sabata F. De,Aaron Dominguez,Daniela Dorner,Michele Doro,D. Elsaesser,Manel Errando,Daniel Ferenc,E. Fernndez,R. Firpo,M. V. Fonseca,Ll. Font,Nicola Galante,R. J. García López,M. Garczarczyk,M. Gaug,Florian Goebel,D. Hadasch,Masaaki Hayashida,A. Herrero,Dorothee Hildebrand,D. Hoehne-Moench,J. Hose,Chieh Hsu,T. Jogler,Daniel Kranich,Barbera A. La,A. Laille,E. Leonardo,Elina Lindfors,Saverio Lombardi,Francesco Longo,Morgan Lopez,E. Lorenz,Pratik Majumdar,G. Maneva,Nijil Mankuzhiyil,Karl Mannheim,L. Maraschi,Mosè Mariotti,M. I. Martínez,Daniel Mazin,Mario Meucci,Jose Miguel Miranda,R. Mirzoyan,H. Miyamoto,Javier Moldon,Mariano Moles,Abelardo Moralejo,Daniel Nieto,Kari Nilsson,Jelena Ninkovic,Igor Oya,Riccardo Paoletti,J. M. Paredes,M. Pasanen,D. Pascoli,Felicitas Pauss,R. G. Pegna,Miguel A. Pérez-Torres,Massimo Persic,L. Peruzzo,Francisco Prada,E. Prandini,N. Puchades,Ignasi Reichardt,Wolfgang Rhode,Marc Ribó,J. Rico,M. Rissi,A. Robert,S. Ruegamer,A. Saggion,T. Y. Saito,M. Salvati,Miguel A. Sánchez-Conde,Konstancja Satalecka,V. Scalzotto,V. Scapin,T. Schweizer,M. Shayduk,S. N. Shore,N. Sidro,Diego F. Torres,A. Sierpowska-Bartosik,A. Sillanpää,Julian Sitarek,Dorota Sobczyńska,Felix Spanier,Antonio Stamerra,L. S. Stark,L. O. Takalo,Fabrizio Tavecchio,Petar Temnikov,D. Tescaro,Masahiro Teshima,Nicola Turini,H. Vankov,Robert Wagner,Victor Zabalza,Fabio Zandanel,Roberta Zanin,J. Zapatero +385 more
TL;DR: Radio and VHE observations of the radio galaxy Messier 87 are revealed, revealing a period of extremely strong VHE gamma-ray flares accompanied by a strong increase of theRadio flux from its nucleus, implying that charged particles are accelerated to very high energies in the immediate vicinity of the black hole.