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

A two-zone photohadronic interpretation of the EHBL-like behavior of the 2016 multi-TeV flares of 1ES 1959+650

The high-energy-peaked blazar 1ES 1959+650 is a well-known and well studied nearby blazar that has undergone several episodes of multi-TeV flaring. In 2002 for the first time an orphan TeV flare was observed from this blazar. During a…

High Energy Astrophysical Phenomena · Physics 2021-01-20 Sarira Sahu , Carlos E. López Fortín , Luis H. Castañeda Hernández , Subhash Rajpoot

Multi-TeV flaring from high energy blazars: An evidence of the photohadronic process

The high energy peaked blazars are known to undergo episodes of flaring in GeV-TeV gamma-rays involving different time scales and the flaring mechanism is not well understood despite long term simultaneous multiwavelength observations.…

High Energy Astrophysical Phenomena · Physics 2019-10-16 Sarira Sahu , Carlos E. Lopez Fortin , Shigehiro Nagataki

"Leading blob" model in a stochastic acceleration scenario: the case of the 2009 flare of Mkn~501

Evidence for very hard, intrinsic $\gamma$-ray source spectra, as inferred after correction for absorption in the extragalactic background light (EBL), has interesting implications for the acceleration and radiation mechanisms acting in…

High Energy Astrophysical Phenomena · Physics 2015-05-30 E. Lefa , F. A. Aharonian , F. M. Rieger

Blazars as Ultra-High-Energy Cosmic-Ray Sources: Implications for TeV Gamma-Ray Observations

The spectra of BL Lac objects and Fanaroff-Riley I radio galaxies are commonly explained by the one-zone leptonic synchrotron self-Compton (SSC) model. Spectral modeling of correlated multiwavelength data gives the comoving magnetic field…

High Energy Astrophysical Phenomena · Physics 2012-03-27 Kohta Murase , Charles D. Dermer , Hajime Takami , Giulia Migliori

Multiwavelength study of TeV Blazar Mrk421 during giant flare and observations of TeV AGNs with HAGAR

The radiation mechanism of very high energy $\gamma$-ray emission from blazars and crucial parameters like magnetic field, and size of the emitting region are not well understood yet. To understand the above mentioned properties of blazars,…

High Energy Astrophysical Phenomena · Physics 2011-11-01 A. Shukla , P. R. Vishwanath , G. C. Anupama , T. P. Prabhu , V. R. Chitnis , B. S. Acharya , R. J. Britto , B. B. Singh , P. Bhattacharjee , L. Saha

Simultaneous X-Ray and Gamma-Ray Observations of TeV Blazars: Testing Synchro-Compton Emission Models and Probing the Infrared Extragalactic Background

The last years have seen a revolution in ground-based gamma-ray detectors. We can now detect the spectra of nearby TeV blazars like Mrk 421 and 501 out to approximately 20 TeV, and during the strongest flares, we can now follow fluctuations…

Astrophysics · Physics 2009-10-31 Paolo S. Coppi , Felix A. Aharonian

Spectral analysis of Markarian 421 and Markarian 501 with HAWC

The Hight Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory monitors the gamma-ray sky in the energy range from 100 GeV to 100 TeV and has detected two very high energy (VHE) blazars: Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501)…

High Energy Astrophysical Phenomena · Physics 2019-08-13 S. Coutiño de León , A. Carramiñana , D. Rosa-González

Multiwavelength observations of Mrk 501 in 2008

Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its first VHE detection in 1996. Our goal is to characterize in detail the source gamma-ray emission, together with the radio-to-X-ray emission,…

High Energy Astrophysical Phenomena · Physics 2015-06-23 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 , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , E. Carmona , A. Carosi , D. Carreto Fidalgo , 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 , C. Delgado Mendez , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher , D. Elsaesser , E. Farina , D. Ferenc , M. V. Fonseca , L. Font , K. Frantzen , C. Fruck , R. J. García López , M. Garczarczyk , D. Garrido Terrats , M. Gaug , G. Giavitto , N. Godinović , A. González Muñoz , S. R. Gozzini , A. Hadamek , D. Hadasch , A. Herrero , D. Hildebrand , J. Hose , D. Hrupec , W. Idec , V. Kadenius , H. Kellermann , M. L. Knoetig , J. Krause , 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 , M. Meucci , J. M. Miranda , R. Mirzoyan , A. Moralejo , P. Munar-Adrover , D. Nakajima , A. Niedzwiecki , K. Nilsson , N. Nowak , R. Orito , A. Overkemping , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , S. Partini , M. Persic , F. Prada , P. G. Prada Moroni , E. Prandini , S. Preziuso , I. Puljak , R. Reinthal , W. Rhode , M. Ribó , J. Rico , J. Rodriguez Garcia , S. Rügamer , A. Saggion , T. Saito , K. Saito , M. Salvati , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , S. N. Shore , A. Sillanpää , J. Sitarek , I. Snidaric , D. Sobczynska , F. Spanier , V. Stamatescu , A. Stamerra , T. Steinbring , J. Storz , S. Sun , T. Surić , L. Takalo , 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. M. Wagner , F. Zandanel , R. Zanin , VERITAS Collaboration , : , B. Behera , M. Beilicke , W. Benbow , K. Berger , R. Bird , A. Bouvier , V. Bugaev , M. Cerruti , X. Chen , L. Ciupik , E. Collins-Hughes , W. Cui , C. Duke , J. Dumm , A. Falcone , S. Federici , Q. Feng , J. P. Finley , L. Fortson , A. Furniss , N. Galante , G. H. Gillanders , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , D. Hanna , J. Holder , C. A. Johnson , P. Kaaret , M. Kertzman , D. Kieda , H. Krawczynski , M. J. Lang , A. S Madhavan , G. Maier , P. Majumdar , K. Meagher , P. Moriarty , R. Mukherjee , D. Nieto , A. O'Faoláin de Bhróithe , R. A. Ong , A. N. Otte , A. Pichel , M. Pohl , A. Popkow , H. Prokoph , J. Quinn , J. Rajotte , G. Ratliff , L. C. Reyes , P. T. Reynolds , G. T. Richards , E. Roache , G. H. Sembroski , K. Shahinyan , F. Sheidaei , A. W. Smith , D. Staszak , I. Telezhinsky , M. Theiling , J. Tyler , A. Varlotta , S. Vincent , S. P. Wakely , T. C. Weekes , R. Welsing , D. A. Williams , A. Zajczyk , B. Zitzer , External Collaborators , : , M. Villata , C. M. Raiteri , M. Ajello , M. Perri , H. D. Aller , M. F. Aller , V. M. Larionov , N. V. Efimova , T. S. Konstantinova , E. N. Kopatskaya , W. P. Chen , E. Koptelova , H. Y. Hsiao , O. M. Kurtanidze , M. G. Nikolashvili , G. N. Kimeridze , B. Jordan , P. Leto , C. S. Buemi , C. Trigilio , G. Umana , A. Lahtenmaki , E. Nieppola , M. Tornikoski , J. Sainio , V. Kadenius , M. Giroletti , A. Cesarini , L. Fuhrmann , Yu. A. Kovalev , Y. Y. Kovalev

Evidence of a lepto-hadronic two-zone emission in flare states

The BL Lac Markarian 501 exhibited two flaring activities in the very-high-energy (VHE) band in May 2009. The lack of correlation between X-rays and TeV gamma-rays without increasing in other bands suggested that more than one emission zone…

High Energy Astrophysical Phenomena · Physics 2023-05-17 E. Aguilar-Ruiz , N. Fraija , A. Galván-G ámez

A Novel Approach in Constraining Electron Spectra in Blazar Jets: The Case of Markarian 421

We report results from the observations of the well studied TeV blazar Mrk 421 with the Swift and the Suzaku satellites in December 2008. During the observation, Mrk 421 was found in a relatively low activity state, with the corresponding…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 M. Ushio , L. Stawarz , T. Takahashi , D. Paneque , G. Madejski , M. Hayashida , J. Kataoka , Y. T. Tanaka , T. Tanaka , M. Ostrowski

A multi-zone model for simulating the high energy variability of TeV blazars

We present a time-dependent multi-zone code for simulating the variability of Synchrotron-Self Compton (SSC) sources. The code adopts a multi-zone pipe geometry for the emission region, appropriate for simulating emission from a standing or…

Astrophysics · Physics 2009-11-13 Philip B. Graff , Markos Georganopoulos , Eric S. Perlman , Demosthenes Kazanas

Multi-band implications of external-IC flares

Very fast variability on scales of minutes is regularly observed in Blazars. The assumption that these flares are emerging from the dominant emission zone of the very high energy (VHE) radiation within the jet challenges current…

High Energy Astrophysical Phenomena · Physics 2016-06-10 Stephan Richter , Felix Spanier

The energy spectrum of high energy gamma rays from Mrk501 by the stereoscopic analysis

We have developed the energy measurement method which based on stereoscopic observation with multiple telescopes for TeV gamma rays. Energy resolution obtained by this method was 23 %. The energy spectrum of the gamma-ray flares of…

Astrophysics · Physics 2012-08-27 The Utah Seven Telescope Array collaboration

Connecting steady emission and Very High Energy flaring states in blazars: the case of Mrk 421

Various attempts have been made in the literature at describing the origin and the physical mechanisms behind flaring events in blazars with radiative emission models, but detailed properties of multi-wavelength (MWL) light curves still…

High Energy Astrophysical Phenomena · Physics 2021-07-07 A. Dmytriiev , H. Sol , A. Zech

High Energy Variability Of Synchrotron-Self Compton Emitting Sources: Why One Zone Models Do Not Work And How We Can Fix It

With the anticipated launch of GLAST, the existing X-ray telescopes, and the enhanced capabilities of the new generation of TeV telescopes, developing tools for modeling the variability of high energy sources such as blazars is becoming a…

Astrophysics · Physics 2009-06-23 Philip B. Graff , Markos Georganopoulos , Eric S. Perlman , Demosthenes Kazanas

Correlation between the TeV and X-ray emission in high--energy peaked BL Lac objects

We discuss the correlation between the evolution of the TeV emission and X-ray radiation observed in high-energy peaked BL Lac objects. We describe such a correlation by a simple power law. In the first part of this work we present…

Astrophysics · Physics 2009-11-10 K. Katarzynski , G. Ghisellini , F. Tavecchio , L. Maraschi , G. Fossati , A. Mastichiadis

Multiwavelength Observations of a Flare from Markarian 501

We present multiwavelength observations of the BL Lacertae object Markarian 501 (Mrk 501) in 1997 between April 8 and April 19. Evidence of correlated variability is seen in very high energy (VHE, E > 350 GeV) gamma-ray observations taken…

Astrophysics · Physics 2009-10-30 M. Catanese , S. M. Bradbury , A. C. Breslin , J. H. Buckley , D. A. Carter-Lewis , M. F. Cawley , C. D. Dermer , D. J. Fegan , J. P. Finley , J. A. Gaidos , A. M. Hillas , W. N. Johnson , F. Krennrich , R. C. Lamb , R. W. Lessard , D. J. Macomb , J. E. McEnery , P. Moriarty , J. Quinn , A. J. Rodgers , H. J. Rose , F. W. Samuelson , G. H. Sembroski , R. Srinivasan , T. C. Weekes , J. Zweerink

First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign

We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 1 April and 10 August 2013, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign,…

High Energy Astrophysical Phenomena · Physics 2015-10-14 A. Furniss , K. Noda , S. Boggs , J. Chiang , F. Christensen , W. Craig , P . Giommi , C. Hailey , F. Harisson , G. Madejski , K. Nalewajko , M. Perri , D. Stern , M. Urry , F. Verrecchia , W. Zhang , M. L. Ahnen , S. Ansoldi , L. A. Antonelli , P. Antoranz , A. Babic , B. Banerjee , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra Gonzalez , W. Bednarek , E. Bernardini , B. Biasuzzi , A. Biland , O. Blanch , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , E. Carmona , A. Carosi , A. Chatterjee , R. Clavero , 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 Ona Wilhelmi , C. Delgado Mendez , F. Di Pierro , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher Glawion , D. Elsaesser , A. Fernandez-Barral , D. Fidalgo , M. V. Fonseca , L. Font , K. Frantzen , C. Fruck , D. Galindo , R. J. Garcia Lopez , M. Garczarczyk , D. Garrido Terrats , M. Gaug , P. Giammaria , N. Godinovic , A. Gonzalez Munoz , D. Guberman , Y. Hanabata , M. Hayashida , J. Herrera , J. Hose , D. Hrupec , G. Hughes , W. Idec , H. Kellermann , K. Kodani , Y. Konno , H. Kubo , J. Kushida , A. La Barbera , D. Lelas , N. Lewandowska , E. Lindfors , S. Lombardi , F. Longo , M. Lopez , R. Lopez-Coto , A. Lopez-Oramas , E. Lorenz , P. Majumdar , M. Makariev , K. Mallot , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martinez , D. Mazin , U. Menzel , J. M. Miranda , R. Mirzoyan , A. Moralejo , D. Nakajima , V. Neustroev , A. Niedzwiecki , M. Nievas Rosillo , K. Nilsson , K. Nishijima , R. Orito , A. Overkemping , S. Paiano , J. Palacio , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , M. Persic , J. Poutanen , P. G. Prada Moroni , E. Prandini , I. Puljak , R. Reinthal , W. Rhode , M. Ribo , J. Rico , J. Rodriguez Garcia , T. Saito , K. Saito , K. Satalecka , V. Scapin , C. Schultz , T. Schweizer , S. N. Shore , A. Sillanpaa , J. Sitarek , I. Snidaric , D. Sobczynska , A. Stamerra , T. Steinbring , M. Strzys , L. Takalo , H. Takami , F. Tavecchio , P. Temnikov , T. Terzic , D. Tescaro , M. Teshima , J. Thaele , D. F. Torres , T. Toyama , A. Treves , V. Verguilov , I. Vovk , M. Will , R. Zanin , A. Archer , W. Benbow , R. Bird , J. Biteau , V. Bugaev , J. V Cardenzana , M. Cerruti , X. Chen , L. Ciupik , M. P. Connolly , W. Cui , H. J. Dickinson , J. Dumm , J. D. Eisch , A. Falcone , Q. Feng , J. P. Finley , H. Fleischhack , P. Fortin , L. Fortson , L. Gerard , G. H. Gillanders , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , N. Haakansson , J. Holder , T. B. Humensky , C. A. Johnson , P. Kaaret , M. Kertzman , D. Kieda , M. Krause , F. Krennrich , M. J. Lang , T. T. Y. Lin , G. Maier , S. McArthur , A. McCann , K. Meagher , P. Moriarty , R. Mukherjee , D. Nieto , A. O'Faolain de Bhroithe , R. A. Ong , N. Park , D. Petry , M. Pohl , A. Popkow , K. Ragan , G. Ratliff , L. C. Reyes , P. T. Reynolds , G. T. Richards , E. Roache , M. Santander , G. H. Sembroski , K. Shahinyan , D. Staszak , I. Telezhinsky , J. V. Tucci , J. Tyler , V. V. Vassiliev , S. P. Wakely , O. M. Weiner , A. Weinstein , A. Wilhelm , D. A. Williams , B. Zitzer , O. Vince L. Fuhrmann , E. Angelakis , V. Karamanavis , I. Myserlis , T. P. Krichbaum , J. A. Zensus , H. Ungerechts , A. Sievers , R. Bachev , M. Bottcher , W. P. Chen , G. Damljanovic , C. Eswaraiah , T. Guver , T. Hovatta , Z. Hughes , S. . I. Ibryamov , M. D. Joner , B. Jordan , S. G. Jorstad , M. Joshi , J. Kataoka , O. M. Kurtanidze , S. O. Kurtanidze , A. Lahteenmaki , G. Latev , H. C. Lin , V. M. Larionov , A. A. Mokrushina , D. A. Morozova , M. G. Nikolashvili , C. M. Raiteri , V. Ramakrishnan , A. C. R. Readhead , A. C. Sadun , L. A. Sigua , E. H. Semkov , A. Strigachev , J. Tammi , M. Tornikoski , Y. V. Troitskaya I. S. Troitsky , M. Villata

Log-parabolic spectra and particle acceleration in blazars. III: SSC emission in the TeV band from Mkn 501

Curved broad-band spectral distributions of non-thermal sources like blazars are described well by a log-parabolic (LP) law where the second degree term measures the curvature. LP energy spectra can be obtained for relativistic electrons by…

Astrophysics · Physics 2009-11-11 E. Massaro , A. Tramacere , M. Perri , P. Giommi , G. Tosti

Discovery of Spectral Variability of Markarian 421 at TeV Energies

The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10m gamma-ray telescope taken in 2000/2001 revealed exceptionally strong and long-lasting flaring…

Astrophysics · Physics 2009-11-07 F. Krennrich , I. H. Bond , S. M. Bradbury , J. H. Buckley , D. A. Carter-Lewis , W. Cui , I. de la Calle Perez , D. J. Fegan , S. J. Fegan , J. P. Finley , J. A. Gaidos , K. Gibbs , G. H. Gillanders , T. A. Hall , A. M. Hillas , J. Holder , D. Horan , M. Jordan , M. Kertzman , D. Kieda , J. Kildea , J. Knapp , K. Kosack , M. J. Lang , S. LeBohec , P. Moriarty , D. Müller , R. A. Ong , R. Pallassini , D. Petry , J. Quinn , N. W. Reay , P. T. Reynolds , H. J. Rose , G. H. Sembroski , R. Sidwell , N. Stanton , S. P. Swordy , V. V. Vassiliev , S. P. Wakely , T. C. Weekes