Related papers: Emitting electrons and source activity in Markaria…

Rapid variability in the synchrotron self Compton model for blazars

Blazars are characterized by large amplitude and fast variability, indicating that the electron distribution is rapidly changing, often on time scales shorter than the light crossing time. The emitting region is sufficiently compact to let…

Astrophysics · Physics 2009-10-31 Marco Chiaberge , Gabriele Ghisellini

Disentangling the synchrotron and Inverse Compton variability in the X-ray emission of the intermediate BL Lac object S5 0716+71

The possibility to detect simultaneously in the X-ray band the synchrotron and Inverse Compton (IC)emission of intermediate BL Lac objects offers the unique opportunity to study contemporaneously the low- and high-energy tails of the…

Astrophysics · Physics 2009-11-11 E. Ferrero , S. J. Wagner , D. Emmanoulopoulos , L. Ostorero

Modelling the emission from blazar jets - the case of PKS 2155-304

A time-dependent Synchrotron Self Compton model (SSC) which is able to motivate the used electron spectra of many SSC models as a balance of acceleration and radiative losses is introduced. Using stochastic acceleration as well as Fermi-I…

High Energy Astrophysical Phenomena · Physics 2010-08-02 Matthias Weidinger , Felix Spanier

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

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

BeppoSAX Observations of Unprecedented Synchrotron Activity in the BL Lac Object Mkn 501

The BL Lac object Mkn 501, one of the only three extragalactic sources (with Mkn 421 and 1ES 2344+514) so far detected at TeV energies, was observed with the BeppoSAX satellite on 7, 11, and 16 April 1997 during a phase of high activity at…

Astrophysics · Physics 2009-10-30 Elena Pian , Giuseppe Vacanti , Gianpiero Tagliaferri , Gabriele Ghisellini , Laura Maraschi , Aldo Treves , C. Megan Urry , Fabrizio Fiore , Paolo Giommi , Eliana Palazzi , Lucio Chiappetti , Rita M. Sambruna

Broadband Spectral Analysis of PKS 0528+134: A Report on Six Years of EGRET Observations

The multiwavelength spectra of PKS 0528+134 during six years of observations by EGRET have been analyzed using synchrotron self-Compton (SSC) and external radiation Compton (ERC) models. We find that a two-component model, in which the…

Astrophysics · Physics 2009-10-31 R. Mukherjee , M. Boettcher , R. C. Hartman , P. Sreekumar , D. J. Thompson , W. A. Mahoney , T. Pursimo , A. Sillanpaa , L. O. Takalo

Multiwavelength spectral and temporal analysis of VHE Blazar 1ES 1959+650: Tracing emission mechanisms across flux states

The high-synchrotron-peaked BL Lac object 1ES\,1959+650 exhibited pronounced activity between MJD~60310 -- 60603, including a very high energy (VHE) detection reported by LHAASO. To investigate the underlying emission mechanisms, we…

High Energy Astrophysical Phenomena · Physics 2025-12-24 Peer Anjum , Athar A. Dar , Zahir Shah , Bari Maqbool , Ranjeev Misra

Constraints on the gamma-ray emitting region in blazars from multi-frequency VLBI measurements

Single-zone synchrotron self-Compton and external Compton models are widely used to explain broad-band Spectral Energy Distributions (SEDs) of blazars from infrared to gamma-rays. These models bear obvious similarities to the homogeneous…

High Energy Astrophysical Phenomena · Physics 2010-06-17 K. V. Sokolovsky , Y. Y. Kovalev , A. P. Lobanov , J. D. Finke , T. Savolainen , A. B. Pushkarev , M. Kadler , F. K. Schinzel , V. H. Chavushyan , L. Carrasco , A. Carraminana , M. A. Gurwell

Spectral Energy Distribution of Markarian 501: Quiescent State vs. Extreme Outburst

The very high energy (VHE; E > 100 GeV) blazar Markarian 501 has a well-studied history of extreme spectral variability and is an excellent laboratory for studying the physical processes within the jets of active galactic nuclei. However,…

High Energy Astrophysical Phenomena · Physics 2012-08-27 The VERITAS Collaboration , V. A. Acciari , T. Arlen , T. Aune , M. Beilicke , W. Benbow , M. Böttcher , D. Boltuch , S. M. Bradbury , J. H. Buckley , V. Bugaev , A. Cannon , A. Cesarini , L. Ciupik , W. Cui , R. Dickherber , C. Duke , M. Errando , A. Falcone , J. P. Finley , G. Finnegan , L. Fortson , A. Furniss , N. Galante , D. Gall , S. Godambe , J. Grube , R. Guenette , G. Gyuk , D. Hanna , J. Holder , D. Huang , C. M. Hui , T. B. Humensky , A. Imran , P. Kaaret , N. Karlsson , M. Kertzman , D. Kieda , A. Konopelko , H. Krawczynski , F. Krennrich , A. S Madhavan , G. Maier , S. McArthur , A. McCann , P. Moriarty , R. A. Ong , A. N. Otte , D. Pandel , J. S. Perkins , A. Pichel , M. Pohl , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , E. Roache , H. J. Rose , M. Schroedter , G. H. Sembroski , D. Steele , S. P. Swordy , M. Theiling , S. Thibadeau , A. Varlotta , V. V. Vassiliev , S. Vincent , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , D. A. Williams , M. Wood , B. Zitzer , The MAGIC Collaboration , : , J. Aleksić , L. A. Antonelli , P. Antoranz , M. Backes , J. A. Barrio , D. Bastieri , J. Becerra González , W. Bednarek , A. Berdyugin , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , A. Boller , G. Bonnoli , P. Bordas , D. Borla Tridon , V. Bosch-Ramon , D. Bose , I. Braun , T. Bretz , M. Camara , E. Carmona , A. Carosi , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , F. Dazzi , A. De Angelis , E. De Cea del Pozo , B. De Lotto , M. De Maria , F. De Sabata , C. Delgado Mendez , A. Diago Ortega , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , D. Elsaesser , M. Errando , D. Ferenc , M. V. Fonseca , L. Font , R. J. García López , M. Garczarczyk , M. Gaug , G. Giavitto , N. Godinović , D. Hadasch , A. Herrero , D. Hildebrand , D. Höhne-Mönch , J. Hose , D. Hrupec , T. Jogler , S. Klepser , T. Krähenbühl , D. Kranich , J. Krause , A. La Barbera , E. Leonardo , E. Lindfors , S. Lombardi , F. Longo , M. López , E. Lorenz , P. Majumdar , M. Makariev , 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 , A. Moralejo , D. Nieto , K. Nilsson , R. Orito , I. Oya , R. Paoletti , J. M. Paredes , S. Partini , M. Pasanen , F. Pauss , R. G. Pegna , M. A. Perez-Torres , M. Persic , L. Peruzzo , J. Pochon , F. Prada , P. G. Prada Moroni , E. Prandini , N. Puchades , I. Puljak , I. Reichardt , R. Reinthal , W. Rhode , M. Ribó , J. Rico , M. Rissi , S. Rügamer , A. Saggion , K. Saito , T. Y. Saito , M. Salvati , M. Sánchez-Conde , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , M. Shayduk , S. N. Shore , A. Sierpowska-Bartosik , A. Sillanpää , J. Sitarek , D. Sobczynska , F. Spanier , S. Spiro , A. Stamerra , B. Steinke , J. Storz , N. Strah , J. C. Struebig , T. Suric , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , D. F. Torres , H. Vankov , R. M. Wagner , Q. Weitzel , V. Zabalza , F. Zandanel , R. Zanin , D. Paneque , M. Hayashida

The physical properties of Fermi BL Lac objects jets

We investigate the physical properties of BL Lac objects (BL Lacs) jets by modeling the quasi-simultaneous spectral energy distributions (SEDs) of 22 {\it Fermi} BL Lac objects in the frame of a simple one-zone synchrotron self-Compton…

High Energy Astrophysical Phenomena · Physics 2014-03-05 Dahai Yan , Houdun Zeng , Li Zhang

Time-dependent simulations of emission from FSRQ PKS1510-089: multiwavelength variability of external Compton and SSC models

[abridged] We present results of modeling the SED and multiwavelength variability of the bright FSRQ PKS1510-089 with our time-dependent multizone Monte Carlo/Fokker-Planck code (Chen et al. 2001). As primary source of seed photons for…

High Energy Astrophysical Phenomena · Physics 2015-06-05 Xuhui Chen , Giovanni Fossati , Edison Liang , Markus Boettcher

Modeling the Broadband Spectral Energy Distribution of the Microquasars XTE J1550-564 and H 1743-322

We report results from a systematic study of the spectral energy distribution (SED) and spectral evolution of XTE J1550--564 and H 1743--322 in outburst. The jets of both sources have been directly imaged at both radio and X-ray…

Astrophysics · Physics 2008-11-26 Yongquan Xue , Xue-Bing Wu , Wei Cui

X-ray Spectral Variability of TeV Blazars during Rapid Flares

The spectral energy distribution (SED) of TeV blazars peaks both at keV and TeV energies. The X-ray emission is generally believed to originate in the synchrotron emission from relativistic electrons (and positrons) in the jet of these…

Astrophysics · Physics 2008-11-26 Yongquan Xue , Feng Yuan , Wei Cui

Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013

We present coordinated multiwavelength observations of the bright, nearby BL Lac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations and instruments, providing…

High Energy Astrophysical Phenomena · Physics 2017-08-30 M. Baloković , D. Paneque , G. Madejski , A. Furniss , J. Chiang , the NuSTAR team , : , M. Ajello , D. M. Alexander , D. Barret , R. Blandford , S. E. Boggs , F. E. Christensen , W. W. Craig , K. Forster , P. Giommi , B. W. Grefenstette , C. J. Hailey , F. A. Harrison , A. Hornstrup , T. Kitaguchi , J. E. Koglin , K. K. Madsen , P. H. Mao , H. Miyasaka , K. Mori , M. Perri , M. J. Pivovaroff , S. Puccetti , V. Rana , D. Stern , G. Tagliaferri , C. M. Urry , N. J. Westergaard , W. W. Zhang , A. Zoglauer , the VERITAS collaboration , : , S. Archambault , A. A. Archer , A. Barnacka , W. Benbow , R. Bird , J. Buckley , V. Bugaev , 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 , L. Fortson , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , M. Huetten , N. Haakansson , J. Holder , T. B. Humensky , C. A. Johnson , P. Kaaret , M. Kertzman , Y. Khassen , D. Kieda , M. Krause , F. Krennrich , M. J. Lang , G. Maier , S. McArthur , K. Meagher , P. Moriarty , T. Nelson , D. Nieto , R. A. Ong , N. Park , M. Pohl , A. Popkow , E. Pueschel , P. T. Reynolds , G. T. Richards , E. Roache , M. Santander , G. H. Sembroski , K. Shahinyan , A. W. Smith , D. Staszak , I. Telezhinsky , N. W. Todd , J. V. Tucci , J. Tyler , S. Vincent , A. Weinstein , A. Wilhelm , D. A. Williams , B. Zitzer , the MAGIC collaboration , : , M. L. Ahnen , S. Ansoldi , L. A. Antonelli , P. Antoranz , A. Babic , B. Banerjee , P. Bangale , U. Barres de Almeida , J. Barrio , J. Becerra González , 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 , B. De Lotto , E. D. de Oña Wilhelmi , C. Delgado Mendez , F. Di Pierro , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Elsaesser , A. Fernández-Barral , D. Fidalgo , M. V. Fonseca , L. Font , K. Frantzen , C. Fruck , D. Galindo , R. J. García López , M. Garczarczyk , D. Garrido Terrats , M. Gaug , P. Giammaria , D. Eisenacher , N. Godinović , A. González Muñoz , D. Guberman , A. Hahn , Y. Hanabata , M. Hayashida , J. Herrera , J. Hose , D. Hrupec , G. Hughes , W. Idec , K. Kodani , Y. Konno , H. Kubo , J. Kushida , A. La Barbera , D. Lelas , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , A. López-Oramas , E. Lorenz , P. Majumdar , M. Makariev , K. Mallot , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martínez , D. Mazin , U. Menzel , J. M. Miranda , R. Mirzoyan , A. Moralejo , E. Moretti , D. Nakajima , V. Neustroev , A. Niedzwiecki , M. Nievas-Rosillo , K. Nilsson , K. Nishijima , K. Noda , R. Orito , A. Overkemping , S. Paiano , S. Palacio , M. Palatiello , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , M. Persic , J. Poutanen , P. G. Prada Moroni , E. Prandini , I. Puljak , W. Rhode , M. Ribó , J. Rico , J. Rodriguez Garcia , T. Saito , K. Satalecka , V. Scapin , C. Schultz , T. Schweizer , S. N. Shore , A. Sillanpää , J. Sitarek , I. Snidaric , D. Sobczynska , A. Stamerra , T. Steinbring , M. Strzys , L. O. Takalo , H. Takami , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , J. Thaele , D. F. Torres , T. Toyama , A. Treves , V. Verguilov , I. Vovk , J. E. Ward , M. Will , M. H. Wu , R. Zanin , external collaborators , : , J. Perkins , F. Verrecchia , C. Leto , M. Böttcher , M. Villata , C. M. Raiteri , J. A. Acosta-Pulido , R. Bachev , A. Berdyugin , D. A. Blinov , M. I. Carnerero , W. P. Chen , P. Chinchilla , G. Damljanovic , C. Eswaraiah , T. S. Grishina , S. Ibryamov , B. Jordan , S. G. Jorstad , M. Joshi , E. N. Kopatskaya , O. M. Kurtanidze , S. O. Kurtanidze , E. G. Larionova , L. V. Larionova , V. M. Larionov , G. Latev , H. C. Lin , A. P. Marscher , A. A. Mokrushina , D. A. Morozova , M. G. Nikolashvili , E. Semkov , A. Strigachev , Yu. V. Troitskaya , I. S. Troitsky , O. Vince , J. Barnes , T. Güver , J. W. Moody , A. C. Sadun , S. Sun , T. Hovatta , J. L. Richards , W. Max-Moerbeck , A. C. Readhead , A. Lähteenmäki , M. Tornikoski , J. Tammi , V. Ramakrishnan , R. Reinthal , E. Angelakis , L. Fuhrmann , I. Myserlis , V. Karamanavis , A. Sievers , H. Ungerechts , J. A. Zensus

Synchrotron and Synchrotron Self-Compton Spectral Signatures and Blazar Emission Models

We find that energy losses due to synchrotron self-Compton (SSC) emission in blazar jets can produce distinctive signatures in the time-averaged synchrotron and SSC spectra of these objects. For a fairly broad range of particle injection…

Astrophysics · Physics 2009-11-07 James Chiang , Markus Boettcher

BL Lac Objects in the Synchrotron Proton Blazar Model

We calculate the spectral energy distribution (SED) of electromagnetic radiation and the spectrum of high energy neutrinos from BL Lac objects in the context of the Synchrotron Proton Blazar Model. In this model, the high energy hump of the…

Astrophysics · Physics 2008-11-26 A. Muecke , R. J. Protheroe , R. Engel , J. P. Rachen , T. Stanev

A Single Zone Synchrotron Model for Flares of PKS 1510-089

PKS 1510-089 is one of the most variable blazars. Very high energy gamma ray emission from this source was observed by H.E.S.S. during March-April 2009 and by MAGIC from February 3 to April 3, 2012 quasi-simultaneously with multi-wavelength…

High Energy Astrophysical Phenomena · Physics 2017-02-15 Partha Pratim Basumallick , Nayantara Gupta

Quasi-Simultaneous Broadband Spectral Energy Distributions of a Sample of Fermi Blazars -- I. Correlation Results

Blazars' non-thermal emission shows rapid variability across all wavelengths, so spectral energy distributions (SEDs) built from quasi-simultaneous data are crucial for revealing the jets physical properties. In this work, we construct…

High Energy Astrophysical Phenomena · Physics 2026-05-22 Yi Zhong , Zhujian Wan , Rui Xue , Hubing Xiao , Dingrong Xiong , Ze-Rui Wang

Compton Scattering of Self-Absorbed Synchrotron Emission

Synchrotron self-Compton (SSC) scattering is an important emission mechanism in many astronomical sources, such as gamma-ray bursts (GRBs) and active galactic nuclei (AGNs). We give a complete presentation of the analytical approximations…

High Energy Astrophysical Phenomena · Physics 2015-06-04 He Gao , Wei-Hua Lei , Xue-Feng Wu , Bing Zhang