Related papers: On the rapid TeV flaring activity of Markarian 501

Spectral characteristics of Mrk 501 during the 2012 and 2014 flaring states

Observations at Very High Energies (VHE, E > 100 GeV) of the BL Lac object Mrk 501 taken with the High Energy Stereoscopic System (H.E.S.S.) in four distinct periods between 2004 and 2014 are presented, with focus on the 2012 and 2014…

High Energy Astrophysical Phenomena · Physics 2019-08-15 Gabriele Cologna , Nachiketa Chakraborty , Mahmoud Mohamed , Frank Rieger , Carlo Romoli , Andrew Taylor , Stefan J. Wagner , Alicja Wierzcholska , Agnieszka Jacholkowska

Hadronic Correlated Flares from Mrk 501

We discuss the possibility of explaining the extraordinary, correlated X-ray/TeV flares observed during April 1997 from Mrk 501, by synchrotron-pair cascades injected by synchrotron radiation from ultra-high energy protons and muons.…

Astrophysics · Physics 2009-10-31 Jorg P. Rachen

Unprecedented study of the broadband emission of Mrk 421 during flaring activity in March 2010

A flare from the TeV blazar Mrk 421, occurring in March 2010, was observed for 13 consecutive days from radio to very high energy (VHE, E > 100 GeV) gamma-rays with MAGIC, VERITAS, Whipple, FermiLAT, MAXI, RXTE, Swift, GASP-WEBT, and…

High Energy Astrophysical Phenomena · Physics 2015-06-16 The MAGIC Collaboration , J. Aleksić , S. Ansoldi , L. A. Antonelli , P. Antoranz , A. Babic , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , E. Bernardini , B. Biasuzzi , A. Biland , O. Blanch , A. Boller , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , E. Carmona , A. Carosi , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , P. Da Vela , F. Dazzi , A. De Angelis , G. De Caneva , B. De Lotto , E. de Oña Wilhelmi , C. Delgado Mendez , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher , D. Elsaesser , M. V. Fonseca , L. Font , K. Frantzen , C. Fruck , D. Galindo , R. J. García López , M. Garczarczyk , D. Garrido Terrats , M. Gaug , N. Godinović , A. González Muñoz , S. R. Gozzini , D. Hadasch , Y. Hanabata , M. Hayashida , J. Herrera , D. Hildebrand , J. Hose , D. Hrupec , G. Hughes , W. Idec , V. Kadenius , H. Kellermann , M. L. Knoetig , K. Kodani , Y. Konno , J. Krause , H. Kubo , J. Kushida , A. La Barbera , D. Lelas , N. Lewandowska , E. Lindfors , S. Lombardi , M. López , R. López-Coto , A. López-Oramas , E. Lorenz , I. Lozano , M. Makariev , K. Mallot , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martínez , D. Mazin , U. Menzel , J. M. Miranda , R. Mirzoyan , A. Moralejo , P. Munar-Adrover , D. Nakajima , A. Niedzwiecki , K. Nilsson , K. Nishijima , K. Noda , R. Orito , A. Overkemping , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , R. Reinthal , W. Rhode , M. Ribó , J. Rico , J. Rodriguez Garcia , S. Rügamer , T. Saito , K. Saito , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , S. Sun , S. N. Shore , A. Sillanpää , J. Sitarek , I. Snidaric , D. Sobczynska , F. Spanier , V. Stamatescu , A. Stamerra , T. Steinbring , B. Steinke , J. Storz , M. Strzys , L. Takalo , H. Takami , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , J. Thaele , O. Tibolla , D. F. Torres , T. Toyama , A. Treves , M. Uellenbeck , P. Vogler , R. Zanin , The VERITAS Collaboration , : , S. Archambault , A. Archer , M. Beilicke , W. Benbow , K. Berger , R. Bird , J. Biteau , J. H. Buckley , V. Bugaev , M. Cerruti , X. Chen , L. Ciupik , E. Collins-Hughes , W. Cui , J. D. Eisch , A. Falcone , Q. Feng , J. P. Finley , P. Fortin , L. Fortson , A. Furniss , N. Galante , G. H. Gillanders , S. Griffin , G. Gyuk , N. Håkansson , J. Holder , C. A. Johnson , P. Kaaret , P. Kar , M. Kertzman , D. Kieda , M. J. Lang , S. McArthur , A. McCann , K. Meagher , J. Millis , P. Moriarty , R. A. Ong , A. N. Otte , J. S. Perkins , A. Pichel , M. Pohl , A. Popkow , H. Prokoph , E. Pueschel , K. Ragan , L. C. Reyes , P. T. Reynolds , G. T. Richards , E. Roache , A. C. Rovero , G. H. Sembroski , K. Shahinyan , D. Staszak , I. Telezhinsky , J. V. Tucci , J. Tyler , A. Varlotta , S. P. Wakely , R. Welsing , A. Wilhelm , D. A. Williams , External Collaborators , : , S. Buson , J. Finke , M. Villata , C. Raiteri , H. D. Aller , M. F. Aller , A. Cesarini , W. P. Chen , M. A. Gurwell , S. G. Jorstad , G. N. Kimeridze , E. Koptelova , O. M. Kurtanidze , S. O. Kurtanidze , A. Lähteenmäki , V. M. Larionov , E. G. Larionova , H. C. Lin , B. McBreen , J. W. Moody , D. A. Morozova , A. P. Marscher , W. Max-Moerbeck , M. G. Nikolashvili , M. Perri , A. C. S. Readhead , J. L. Richards , J. A. Ros , A. C. Sadun , T. Sakamoto , L. A. Sigua , P. S. Smith , M. Tornikoski , I. S. Troitsky , A. E. Wehrle , B. Jordan

Five-year Monitorings of TeV Blazars with ASCA and RXTE

We study the temporal/spectral variability of two extragalactic TeV sources, Mrk 421 and Mrk 501, based on 5-year observations with the ASCA and RXTE satellites. We found that the peak of the synchrotron emission exists just in the X-ray…

Astrophysics · Physics 2007-05-23 J. Kataoka , T. Takahashi , F. Takahara , P. G. Edwards , K. Hayashida , S. Inoue , N. Iyomoto , N. Kawai , G. M. Madejski , C. Tanihata , S. J. Wagner

A two-zone photohadronic scenario for EHBL-like behavior of Mrk 501

Major outbursts have been observed from the well-known high-energy peaked blazar Markarian 501 since its discovery in 1996. Especially, two episodes of very high energy gamma-ray flaring events during May-July 2005 and June 2012 are of…

High Energy Astrophysical Phenomena · Physics 2020-10-07 Sarira Sahu , Carlos E. Lopez Fortin , Luis H. Castañeda Hernandez , Shigehiro Nagataki , Subhash Rajpoot

Multi-TeV flaring in nearby High Energy Blazars: A photohadronic scenario

Blazars are a subclass of AGN and flaring in multi-TeV gamma-ray seems to be the major activity in high energy blazars a subgrup of blazars. Flaring is also unpredictable and switches between quiescent and active states involving different…

High Energy Astrophysical Phenomena · Physics 2019-07-03 Sarira Sahu

Observations of TeV gamma ray flares from Markarian 501 with the Telescope Array Prototype

We will report the observations of TeV gamma ray flares from Markarian 501 using Telescope Array Prototype. The observation were carried out continuously from the end of March to the end of July in 1997. The energy spectrum, and the time…

Astrophysics · Physics 2016-11-23 Telescope Array Collaboration

The extreme HBL behaviour of Markarian 501 during 2012

A multiwavelength campaign was organized to take place between March and July of 2012. Excellent temporal coverage was obtained with more than 25 instruments, including the MAGIC, FACT and VERITAS Cherenkov telescopes, the instruments on…

High Energy Astrophysical Phenomena · Physics 2020-01-29 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 , W. Bhattacharyya , O. Blanch , G. Bonnoli , R. Carosi , A. Carosi , A. Chatterjee , S. M. Colak , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , P. Cumani , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , M. Delfino , J. Delgado , F. Di Pierro , M. Doert , A. Domínguez , D. Dominis Prester , M. Doro , D. Eisenacher Glawion , 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 , K. Ishio , Y. Konno , H. Kubo , J. Kushida , D. Kuveždić , D. Lelas , E. Lindfors , S. Lombardi , F. Longo , M. López , C. Maggio , P. Majumdar , M. Makariev , G. Maneva , M. Manganaro , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , U. Menzel , M. Minev , J. M. Miranda , R. Mirzoyan , A. Moralejo , V. Moreno , E. Moretti , T. Nagayoshi , V. Neustroev , A. Niedzwiecki , M. Nievas Rosillo , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , L. Nogués , S. Paiano , J. Palacio , D. Paneque , R. Paoletti , J. M. Paredes , G. Pedaletti , M. Peresano , L. Perri , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , J. R. Garcia , I. Reichardt , M. Ribó , J. Rico , C. Righi , A. Rugliancich , T. Saito , K. Satalecka , S. Schroeder , T. Schweizer , S. N. Shore , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Stamerra , M. Strzys , T. Surić , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albà , A. Treves , S. Tsujimoto , G. Vanzo , M. Vazquez Acosta , I. Vovk , J. E. Ward , M. Will , D. Zarić , A. Arbet-Engels , D. Baack , M. Balbo , A. Biland , M. Blank , T. Bretz , K. Bruegge , M. Bulinski , J. Buss , A. Dmytriiev , D. Dorner , S. Einecke , D. Elsaesser , T. Herbst , D. Hildebrand , L. Kortmann , L. Linhoff , M. Mahlke , K. Mannheim , S. A. Mueller , D. Neise , A. Neronov , M. Noethe , J. Oberkirch , A. Paravac , W. Rhode , B. Schleicher , F. Schulz , K. Sedlaczek , A. Shukla , V. Sliusar , R. Walter , A. Archer , W. Benbow , R. Bird , R. Brose , J. H. Buckley , V. Bugaev , J. L. Christiansen , W. Cui , M. K. Daniel , A. Falcone , Q. Feng , J. P. Finley , G. H. Gillanders , O. Gueta , D. Hanna , O. Hervet , J. Holder , G. Hughes , M. Hütten , T. B. Humensky , C. A. Johnson , P. Kaaret , P. Kar , N. Kelley-Hoskins , M. Kertzman , D. Kieda , M. Krause , F. Krennrich , S. Kumar , M. J. Lang , T. T. Y. Lin , G. Maier , S. McArthur , P. Moriarty , R. Mukherjee , S. O'Brien , R. A. Ong , A. N. Otte , N. Park , A. Petrashyk , A. Pichel , M. Pohl , J. Quinn , K. Ragan , P. T. Reynolds , G. T. Richards , E. Roache , A. C. Rovero , C. Rulten , I. Sadeh , M. Santander , G. H. Sembroski , K. Shahinyan , I. Sushch , J. Tyler , S. P. Wakely , A. Weinstein , R. M. Wells , P. Wilcox , A. Wilhel , D. A. Williams , T. J Williamson , B. Zitzer , M. Perri , F. Verrecchia , C. Leto , M. Villata , C. M. Raiteri , S. G. Jorstad , V. M. Larionov , D. A. Blinov , T. S. Grishina , E. N. Kopatskaya , E. G. Larionova , A. A. Nikiforova , D. A. Morozova , Yu. V. Troitskaya , I. S. Troitsky , O. M. Kurtanidze , M. G. Nikolashvili , S. O. Kurtanidze , G. N. Kimeridze , R. A. Chigladze , A. Strigachev , A. C. Sadun , J. W. Moody , W. P. Chen , H. C. Lin , J. A. Acosta-Pulido , M. J. Arévalo , M. I. Carnerero , P. A. González-Morales , A. Manilla-Robles , H. Jermak , I. Steele , C. Mundel , E. Benítez , D. Hiriart , P. S. Smith , W. Max-Moerbeck , A. C. S. Readhead , J. L. Richards , T. Hovatta , A. Lähteenmäki , M. Tornikoski , J. Tammi , M. Georganopoulos , M. G. Baring

Photohadronic Modelling of the 2010 Gamma-ray Flare from Mrk 421

Blazars are a subclass of active galactic nuclei (AGN) that have a relativistic jet with a small viewing angle towards the observer. Recent results based on hadronic scenarios have motivated an ongoing discussion of how a blazar can produce…

High Energy Astrophysical Phenomena · Physics 2021-01-07 A. Rosales de León , A. M. Brown , P. M. Chadwick

Suzaku observation of TeV blazar the 1ES 1218+304: clues on particle acceleration in an extreme TeV blazar

We observed the TeV blazar 1ES 1218+304 with the X-ray astronomy satellite Suzaku in May 2006. At the beginning of the two-day continuous observation, we detected a large flare in which the 5-10 keV flux changed by a factor of ~2 on a…

Astrophysics · Physics 2009-06-23 R. Sato , J. Kataoka , T. Takahashi , G. M. Madejski , S. Rugamer , S. J. Wagner

Application of the synchrotron proton blazar model to BL Lac objects

We apply the synchrotron proton blazar (SPB) model to the April 1997 flare of Markarian 501 and find we are able to fit the observed spectral energy distribution. We explore the effect of target photon density on the high energy part of the…

Astrophysics · Physics 2009-10-31 R. J. Protheroe , A. Muecke

On the correlation between X-rays and TeV gamma-rays in HBL Blazars

The gamma-ray emission in blazars can be attributed to the leptonic Synchrotron Self-Compton (SSC) model, photo-hadronic interactions, or a combination thereof. While evidence supports both models, their specific contributions remain…

High Energy Astrophysical Phenomena · Physics 2024-12-17 Mabel Osorio-Archila , María Magdalena González , J. Rodrigo Sacahui

GeV Emission from TeV Blazars and Intergalactic Magnetic Fields

Several high-frequency peaked BL Lac objects such as Mrk 501 are strong TeV emitters. However, a significant fraction of the TeV gamma rays emitted are likely to be absorbed in interactions with the diffuse IR background, yielding…

Astrophysics · Physics 2009-11-07 Z. G. Dai , B. Zhang , L. J. Gou , P. Meszaros , E. Waxman

The June 2008 flare of Markarian 421 from optical to TeV energies

We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very high energy ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high energy $\gamma$-ray signal…

Astrophysics · Physics 2012-08-27 The Agile Collaboration , Webt Collaboration , Magic Collaboration , Veritas Collaboration , I. Donnarumma

Additional Acceleration of Protons and Energetic Neutrino Production in a Filamentary Jet of the Blazar Markarian 501

Blazars have been regarded as one of the most powerful sources of the highest energy cosmic rays and also their byproducts, neutrinos. Provided that a magnetized filamentary system is established in a blazar jet as well, we could apply the…

High Energy Astrophysical Phenomena · Physics 2015-05-19 Y. S. Honda , M. Honda

Stochastic acceleration in Extreme TeV BL Lacs through MCMC

Extreme TeV BL Lacs are a class of blazars with unique spectral and temporal features, not easily reproducible using standard one-zone models based on single shock acceleration. To account for their peculiar properties we elaborated a…

High Energy Astrophysical Phenomena · Physics 2024-10-01 Alberto Sciaccaluga , Fabrizio Tavecchio , Marco Landoni , Agnese Costa

Long-term spectra of the blazars Mrk 421 and Mrk 501 at TeV energies seen by HAWC

The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys the very high energy sky in the 300 GeV to $>100$ TeV energy range. HAWC has detected two blazars above $11\sigma$, Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501).…

High Energy Astrophysical Phenomena · Physics 2022-04-27 A. Albert , R. Alfaro , C. Alvarez , J. R. Angeles Camacho , J. C. Arteaga-Velázquez , K. P. Arunbabu , D. Avila Rojas , H. A. Ayala Solares , V. Baghmanyan , Belmont-Moreno , K. S. Caballero-Mora , T. Capistrán , A. Carramiñana , S. Casanova , U. Cotti , J. Cotzomi , S. Coutiño de León , E. De la Fuente , R. Diaz Hernandez , M. A. DuVernois , M. Durocher , J. C. Díaz-Vélez , K. Engel , C. Espinoza , K. L. Fan , M. Fernández Alonso , N. Fraija , D. Garcia , J. A. García-González , F. Garfias , M. M. González , J. A. Goodman , J. P. Harding , B. Hona , D. Huang , F. Hueyotl-Zahuantitla , P. Hüntemeyer , A. Iriarte , V. Joshi , A. Lara , W. H. Lee , J. Lee , H. León Vargas , A. L. Longinotti , G. Luis-Raya , K. Malone , O. Martinez , J. Martínez-Castro , J. A. Matthews , P. Miranda-Romagnoli , E. Moreno , M. Mostafá , A. Nayerhoda , L. Nellen , M. Newbold , R. Noriega-Papaqui , A. Peisker , Y. Pérez Araujo , E. G. Pérez-Pérez , C. D. Rho , D. Rosa-González , H. Salazar , F. Salesa Greus , A. Sandoval , M. Schneider , J. Serna-Franco , A. J. Smith , R. W. Springer , K. Tollefson , I. Torres , R. Torres-Escobedo , F. Ureña-Mena , L. Villaseñor , X. Wang , T. Weisgarber , E. Willox , H. Zhou , C. de León

Multiwavelength observations of Mkn 501 during the 1997 high state

During the observation period 1997, the nearby Blazar Mkn 501 showed extremely strong emission and high variability. We examine multiwavelength aspects of this event using radio, optical, soft and hard X-ray and TeV data. We concentrate on…

Astrophysics · Physics 2009-10-31 D. Petry , M. Boettcher , V. Connaughton , A. Lahteenmaki , T. Pursimo , C. M. Raiteri , F. Schroeder , A. Sillanpaa , G. Sobrito , L. Takalo , H. Terasranta , G. Tosti , M. Villata

Simultaneous X-Ray and TeV Gamma-Ray Observations of the TeV Blazar Markarian 421 during February and May 2000

In this paper we present the results of simultaneous observations of the TeV blazar Markarian 421 (Mrk 421) at X-ray and TeV Gamma-ray energies with the Rossi X-Ray Timing Explorer (RXTE) and the stereoscopic Cherenkov Telescope system of…

Astrophysics · Physics 2009-11-06 H. Krawczynski , R. Sambruna , A. Kohnle , P. S. Coppi , The HEGRA Collaboration , F. Aharonian

Multiwavelength study of TeV Blazar Mrk421 during giant flare

Context: The nearby (z=0.031) TeV blazar Mrk421 was reported to be in a high state of flux activity since November, 2009. Aims: To investigate possible changes in the physical parameters of Mrk421 during its high state of activity using…

High Energy Astrophysical Phenomena · Physics 2015-06-04 A. Shukla , V. R. Chitnis , P. R. Vishwanath , B. S. Acharya , G. C. Anupama , P. Bhattacharjee , R. J. Britto , T. P. Prabhu , L. Saha , B. B. Singh