Related papers: Modelling the variability of 1ES1218+30.4

Long-term multi-wavelength study of 1ES 0647+250

The BL Lac object 1ES 0647+250 is one of the few distant $\gamma$-ray emitting blazars detected at very high energies (VHE, $\gtrsim$100 GeV) during a non-flaring state. It was detected with the MAGIC telescopes during its low activity in…

High Energy Astrophysical Phenomena · Physics 2023-02-08 MAGIC Collaboration , V. A. Acciari , T. Aniello , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , C. Arcaro , M. Artero , K. Asano , D. Baack , A. Babić , A. Baquero , U. Barres de Almeida , J. A. Barrio , I. Batković , J. Becerra González , W. Bednarek , E. Bernardini , M. Bernardos , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , A. Biland , O. Blanch , H. Bökenkamp , G. Bonnoli , Ž. Bošnjak , I. Burelli , G. Busetto , R. Carosi , M. Carretero-Castrillo , G. Ceribella , Y. Chai , A. Chilingarian , S. Cikota , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , G. D'Amico , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , A. Del Popolo , M. Delfino , J. Delgado , C. Delgado Mendez , D. Depaoli , F. Di Pierro , L. Di Venere , E. Do Souto Espiñeira , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , G. Emery , V. Fallah Ramazani , L. Fariña , A. Fattorini , L. Font , C. Fruck , S. Fukami , Y. Fukazawa , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , J. G. Giesbrecht Paiva , N. Giglietto , F. Giordano , P. Gliwny , N. Godinović , J. G. Green , D. Green , D. Hadasch , A. Hahn , T. Hassan , L. Heckmann , J. Herrera , D. Hrupec , M. Hütten , T. Inada , R. Iotov , K. Ishio , Y. Iwamura , I. Jiménez Martínez , J. Jormanainen , D. Kerszberg , Y. Kobayashi , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , L. Linhoff , S. Lombardi , F. Longo , R. López-Coto , M. López-Moya , A. López-Oramas , S. Loporchio , A. Lorini , E. Lyard , B. Machado de Oliveira Fraga , P. Majumdar , M. Makariev , G. Maneva , M. Manganaro , S. Mangano , K. Mannheim , M. Mariotti , M. Martínez , A. Mas Aguilar , D. Mazin , S. Menchiari , S. Mender , S. Mićanović , D. Miceli , T. Miener , J. M. Miranda , R. Mirzoyan , E. Molina , H. A. Mondal , A. Moralejo , D. Morcuende , V. Moreno , T. Nakamori , C. Nanci , L. Nava , V. Neustroev , M. Nievas Rosillo , C. Nigro , K. Nilsson , K. Nishijima , T. Njoh Ekoume , K. Noda , S. Nozaki , Y. Ohtani , T. Oka , J. Otero-Santos , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , L. Pavletić , M. Persic , M. Pihet , F. Podobnik , P. G. Prada Moroni , E. Prandini , G. Principe , C. Priyadarshi , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , F. G. Saturni , B. Schleicher , K. Schmidt , F. Schmuckermaier , J. L. Schubert , T. Schweizer , J. Sitarek , V. Sliusar , D. Sobczynska , A. Spolon , A. Stamerra , J. Strišković , D. Strom , M. Strzys , Y. Suda , T. Surić , M. Takahashi , R. Takeishi , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , L. Tosti , S. Truzzi , A. Tutone , S. Ubach , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , S. Ventura , V. Verguilov , I. Viale , C. F. Vigorito , V. Vitale , I. Vovk , R. Walter , M. Will , C. Wunderlich , T. Yamamoto , D. Zarić , J. A. Acosta-Pulido , F. D'Ammando , T. Hovatta , S. Kiehlmann , I. Liodakis , C. Leto , W. Max-Moerbeck , L. Pacciani , M. Perri , A. C. S. Readhead , R. A. Reeves , F. Verrecchia

Multiwavelength Observations of the Blazar VER J0521+211 During an Elevated TeV Gamma-Ray State

We report on a long-lasting, elevated gamma-ray flux state from VER J0521+211 observed by VERITAS, MAGIC, and Fermi-LAT in 2013 and 2014. The peak integral flux above 200 GeV measured with the nightly-binned light curve is $(8.8 \pm 0.4)…

High Energy Astrophysical Phenomena · Physics 2022-08-10 The VERITAS Collaboration , The MAGIC Collaboration

INTEGRAL and Swift Observations of Blazars in Outburst

The blazars 3C 454.3, PKS 0537-441 and PKS 2155-304 are traditionally known to be among the most active sources of this class. They emit at all frequencies, up to the gamma-rays, and are good probes of multiwavelength nuclear variability.…

Astrophysics · Physics 2007-07-25 Elena Pian , Luigi Foschini , Gabriele Ghisellini

The variability patterns of the TeV blazar PG 1553+113 from a decade of MAGIC and multi-band observations

PG 1553+113 is one of the few blazars with a convincing quasi-periodic emission in the gamma-ray band. The source is also a very high-energy (VHE; >100 GeV) gamma-ray emitter. To better understand its properties and identify the underlying…

High Energy Astrophysical Phenomena · Physics 2024-03-13 MAGIC Collaboration , H. Abe , S. Abe , J. Abhir , V. A. Acciari , I. Agudo , T. Aniello , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , C. Arcaro , M. Artero , K. Asano , D. Baack , A. Babić , A. Baquero , U. Barres de Almeida , I. Batković , J. Baxter , J. Becerra González , E. Bernardini , J. Bernete , A. Berti , J. Besenrieder , C. Bigongiari , A. Biland , O. Blanch , G. Bonnoli , Ž. Bošnjak , I. Burelli , G. Busetto , A. Campoy-Ordaz , A. Carosi , R. Carosi , M. Carretero-Castrillo , A. J. Castro-Tirado , Y. Chai , A. Cifuentes , S. Cikota , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , G. D'Amico , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , A. Del Popolo , M. Delfino , J. Delgado , C. Delgado Mendez , D. Depaoli , F. Di Pierro , L. Di Venere , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , G. Emery , J. Escudero , L. Fariña , A. Fattorini , L. Foffano , L. Font , S. Fukami , Y. Fukazawa , R. J. García López , S. Gasparyan , M. Gaug , J. G. Giesbrecht Paiva , N. Giglietto , F. Giordano , P. Gliwny , R. Grau , J. G. Green , D. Hadasch , A. Hahn , L. Heckmann , J. Herrera , T. Hovatta , D. Hrupec , M. Hütten , R. Imazawa , T. Inada , R. Iotov , K. Ishio , I. Jiménez Martínez , J. Jormanainen , D. Kerszberg , G. W. Kluge , Y. Kobayashi , P. M. Kouch , H. Kubo , J. Kushida , M. Láinez Lezáun , A. Lamastra , F. Leone , E. Lindfors , I. Liodakis , S. Lombardi , F. Longo , M. López-Moya , A. López-Oramas , S. Loporchio , A. Lorini , B. Machado de Oliveira Fraga , P. Majumdar , M. Makariev , G. Maneva , N. Mang , M. Manganaro , K. Mannheim , M. Mariotti , M. Martínez , M. Martínez-Chicharro , A. Mas-Aguilar , D. Mazin , S. Menchiari , S. Mender , D. Miceli , T. Miener , J. M. Miranda , R. Mirzoyan , M. Molero González , E. Molina , H. A. Mondal , A. Moralejo , D. Morcuende , T. Nakamori , C. Nanci , V. Neustroev , C. Nigro , L. Nikolić , K. Nilsson , K. Nishijima , T. Njoh Ekoume , K. Noda , S. Nozaki , Y. Ohtani , A. Okumura , J. Otero-Santos , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , D. Pavlović , M. Persic , M. Pihet , G. Pirola , F. Podobnik , P. G. Prada Moroni , E. Prandini , G. Principe , C. Priyadarshi , W. Rhode , M. Ribó , J. Rico , C. Righi , N. Sahakyan , T. Saito , K. Satalecka , F. G. Saturni , B. Schleicher , K. Schmidt , F. Schmuckermaier , J. L. Schubert , T. Schweizer , A. Sciaccaluga , J. Sitarek , A. Spolon , A. Stamerra , J. Strišković , D. Strom , Y. Suda , S. Suutarinen , H. Tajima , R. Takeishi , F. Tavecchio , P. Temnikov , K. Terauchi , T. Terzić , M. Teshima , L. Tosti , S. Truzzi , A. Tutone , S. Ubach , J. van Scherpenberg , S. Ventura , V. Verguilov , I. Viale , C. F. Vigorito , V. Vitale , R. Walter , C. Wunderlich , T. Yamamoto , MWL collaborators , : , H. Jermak , I. A. Steele , P. S. Smith , D. Blinov , C. M. Raiteri , M. Villata , D. O. Mirzaqulov , S. O. Kurtanidze , D. Carosati , S. S. Savchenko , J. A. Acosta-Pulido , G. A. Borman , V. Bozhilov , M. I. Carnerero , R. A. Chigladze , G. Damljanovic , S. A. Ehgamberdiev , M. Feige , T. S. Grishina , A. C. Gupta , V. A. Hagen-Thorn , S. Ibryamov , R. Z. Ivanidze , S. G. Jorstad , J. Kania , G. N. Kimeridze , E. N. Kopatskaya , M. Kopp , L. Kunkel , O. M. Kurtanidze , V. M. Larionov , E. G. Larionova , L. V. Larionova , C. Lorey , A. Marchini , A. P. Marscher , M. Minev , D. A. Morozova , M. G. Nikolashvili , E. Ovcharov , D. Reinhart , A. C. Sadun , A. Scherbantin , L. Schneider , E. Semkov , L. A. Sigua , R. Steineke , Yu. V. Troitskaya , I. S. Troitskiy , A. Valcheva , A. A. Vasilyev , O. Vince , E. Zaharieva , N. Zottmann , S. Kiehlmann , A. Readhead , W. Max-Moerbeck , R. A. Reeves , A. Sandrinelli , V. Fallah Ramazani , M. Giroletti , S. Righini , N. Marchili , B. Patricelli , G. Ghirlanda , R. Lico

Multi-Wavelength Observations of 1ES1959+650 in a Flaring State

In May 2002, the BL Lacertae object (BL Lac), 1ES1959+650, was detected in the Very High Energy (VHE) regime by the VERITAS collaboration using the Whipple $\gamma$-ray observatory. During the following two months, the VERITAS collaboration…

Astrophysics · Physics 2007-05-23 M. Schroedter , VERITAS Collaboration , E. Falco , O. M. Kurtanidze , M. Nikolashvili

Variability of the blazar 4C 38.41 (B3 1633+382) from GHz frequencies to GeV energies

The quasar-type blazar 4C 38.41 (B3 1633+382) experienced a large outburst in 2011, which was detected throughout the entire electromagnetic spectrum. We present the results of low-energy multifrequency monitoring by the GASP project of the…

High Energy Astrophysical Phenomena · Physics 2015-06-05 C. M. Raiteri , M. Villata , P. S. Smith , V. M. Larionov , J. A. Acosta-Pulido , M. F. Aller , F. D'Ammando , M. A. Gurwell , S. G. Jorstad , M. Joshi , O. M. Kurtanidze , A. Lähteenmäki , D. O. Mirzaqulov , I. Agudo , H. D. Aller , M. J. Arévalo , A. A. Arkharov , U. Bach , E. Benítez , A. Berdyugin , D. A. Blinov , K. Blumenthal , C. S. Buemi , A. Bueno , T. M. Carleton , M. I. Carnerero , D. Carosati , C. Casadio , W. P. Chen , A. Di Paola , M. Dolci , N. V. Efimova , Sh. A. Ehgamberdiev , J. L. Gómez , A. I. Gonzále , V. A. Hagen-Thorn , J. Heidt , D. Hiriart , Sh. Holikov , T. S. Konstantinova , E. N. Kopatskaya , E. Koptelova , S. O. Kurtanidze , E. G. Larionova , L. V. Larionova , J. León-Tavares , P. Leto , H. C. Lin , E. Lindfors , A. P. Marscher , I. M. McHardy , S. N. Molina , D. A. Morozova , R. Mujica , M. G. Nikolashvili , K. Nilsson , E. P. Ovcharov , N. Panwar , M. Pasanen , I. Puerto-Gimenez , R. Reinthal , G. M. Richter , J. A. Ros , T. Sakamoto , R. D. Schwartz , A. Sillanpää , N. Smith , L. O. Takalo , J. Tammi , B. Taylor , C. Thum , M. Tornikoski , C. Trigilio , I. S. Troitsky , G. Umana , A. T. Valcheva , A. E. Wehrle

Multi Frequency Temporal and Spectral variability study of Blazar PKS 1424-418

A study of blazar PKS 1424-418 was carried out using multi waveband data collected by Fermi-LAT, Swift-XRT, Swift-UVOT and SMARTS telescopes between MJD 56000 to MJD 56600 (14 Mar 2012 to 4 Nov 2013). Two flaring episodes were identified by…

High Energy Astrophysical Phenomena · Physics 2021-01-18 Jayant Abhir , Jophin Joseph , Sonal R Patel , Debanjan Bose

Time dependent modeling of electron acceleration and cooling during blazar flares

We present a new time-dependent leptonic code that we developed to model the varying multi-wavelength (MWL) emission during blazar flares. In our modeling, we assume that the blazar emission originates from a plasma blob located in the jet,…

High Energy Astrophysical Phenomena · Physics 2020-03-18 A. Dmytriiev , H. Sol , A. Zech

An Overview of Blazar Variability

Blazars are characterized by rapid variability at virtually all wavelengths from radio through TeV gamma-rays. The challenge since their discovery has been to understand the origin of their luminous, apparently nonthermal, nuclear emission.…

Astrophysics · Physics 2007-05-23 C. Megan Urry

HESS J1943+213: An Extreme Blazar Shining Through The Galactic Plane

HESS J1943+213 is a very-high-energy (VHE; $>$100 GeV) $\gamma$-ray source in the direction of the Galactic Plane. Studies exploring the classification of the source are converging towards its identification as an extreme synchrotron BL Lac…

High Energy Astrophysical Phenomena · Physics 2018-08-29 The VERITAS Collaboration , A. Archer , W. Benbow , R. Bird , R. Brose , M. Buchovecky , V. Bugaev , W. Cui , M. K. Daniel , A. Falcone , Q. Feng , J. P. Finley , A. Flinders , L. Fortson , A. Furniss , G. H. Gillanders , M. Hütten , D. Hanna , O. Hervet , J. Holder , G. Hughes , T. B. Humensky , C. A. Johnson , P. Kaaret , P. Kar , N. Kelley-Hoskins , D. Kieda , M. Krause , F. Krennrich , S. Kumar , M. J. Lang , T. T. Y. Lin , S. McArthur , P. Moriarty , R. Mukherjee , D. Nieto , S. O'Brien , R. A. Ong , A. N. Otte , N. Park , A. Petrashyk , M. Pohl , A. Popkow , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , G. T. Richards , E. Roache , C. Rulten , I. Sadeh , G. H. Sembroski , K. Shahinyan , J. Tyler , S. P. Wakely , O. M. Weiner , A. Weinstein , R. M. Wells , P. Wilcox , A. Wilhelm , D. A. Williams , W. F. Brisken , P. Pontrelli

Study of Temporal and Spectral variability for Blazar PKS 1830-211 with Multi-Wavelength Data

A study of the gravitationally lensed blazar PKS 1830-211 was carried out using multi waveband data collected by Fermi-LAT, Swift-XRT and Swift-UVOT telescopes between MJD 58400 to MJD 58800 (9 Oct 2018 to 13 Nov 2019). Flaring states were…

High Energy Astrophysical Phenomena · Physics 2021-07-14 Jayant Abhir , Raj Prince , Jophin Joseph , Debanjan Bose , Nayantara Gupta

Complex X-ray spectral variability in Mkn 421 observed with XMM-Newton

The bright blazar Mkn 421 has been observed four times for uninterrupted durations of ~ 9 - 13 hr during the performance verification and calibration phases of the XMM-Newton mission. The source was strongly variable in all epochs, with…

Astrophysics · Physics 2009-11-07 S. Sembay , R. Edelson , A. Markowitz , R. G. Griffiths , M. J. L. Turner

Singular Spectrum Analysis of Fermi-LAT Blazar Light Curves: A Systematic Search for Periodicity and Trends in the Time Domain

A majority of blazars exhibit variable emission across the entire electromagnetic spectrum, observed over various time scales. In particular, discernible periodic patterns are detected in the $\gamma$-ray light curves of a few blazars, such…

High Energy Astrophysical Phenomena · Physics 2025-06-18 Alba Rico , A. Domínguez , P. Peñil , M. Ajello , S. Buson , S. Adhikari , M. Movahedifar

Inverse Compton light curves of blazars under non-linear, time-dependent synchrotron-self Compton cooling

Blazars exhibit flares with a doubling time scale on the order of minutes. Such rapid flares are theoretically challenging and several {models} have been put forward to explain the fast variability. In this paper we continue the discussion…

High Energy Astrophysical Phenomena · Physics 2015-06-22 Michael Zacharias

Simultaneous Observations of Flaring Gamma-ray Blazar 3C 66A with Fermi-LAT and VERITAS

The intermediate-frequency-peaked BL Lac object 3C 66A was detected in a flaring state by the Fermi-LAT and VERITAS observatories in October 2008. These data and follow-up observations at other wavelengths create a rich sample of light…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Luis C. Reyes

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

Multi-Wavelength Variability of BL Lacertae Measured with High Time Resolution

In an effort to locate the sites of emission at different frequencies and physical processes causing variability in blazar jets, we have obtained high time-resolution observations of BL Lacertae over a wide wavelength range: with the…

Astrophysics of Galaxies · Physics 2020-07-17 Zachary R. Weaver , K. E. Williamson , S. G. Jorstad , A. P. Marscher , V. M. Larionov , C. M. Raiteri , M. Villata , J. A. Acosta-Pulido , R. Bachev , G. V. Baida , T. J. Balonek , E. Benitez , G. A. Borman , V. Bozhilov , M. I. Carnerero , D. Carosati , W. P. Chen , G. Damljanovic , V. Dhiman , D. J. Dougherty , S. A. Ehgamberdiev , T. S. Grishina , A. C. Gupta , M. Hart , D. Hiriart , H. Y. Hsiao , S. Ibryamov , M. Joner , G. N. Kimeridze , E. N. Kopatskaya , O. M. Kurtanidze , S. O. Kurtanidze , E. G. Larionova , K. Matsumoto , R. Matsumura , M. Minev , D. O. Mirzaqulov , D. A. Morozova , A. A. Nikiforova , M. G. Nikolashvili , E. Ovcharov , N. Rizzi , A. Sadun , S. S. Savchenko , E. Semkov , J. J. Slater , K. L. Smith , M. Stojanovic , A. Strigachev , Yu. V. Troitskaya , I. S. Troitsky , A. L. Tsai , O. Vince , A. Valcheva , A. A. Vasilyev , E. Zaharieva , A. V. Zhovtan

Observation of the BL Lac objects 1ES 1215+303 and 1ES 1218+304 with the MAGIC telescopes

The two BL Lac objects 1ES 1215+303 and 1ES 1218+304, separated by 0.8 deg, were observed with the MAGIC telescopes in 2010 and 2011. The 20 hours of data registered in January 2011 resulted in the first detection at Very High Energy (>100…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 Pierre Colin , Josefa Becerra Gonzalez , Elina Lindfors , Saverio Lombardi , Julian Sitarek , Antonio Stamera

Blazar Variability From Turbulence in Jets Launched by Magnetically Arrested Accretion Flows

Blazars show variability on timescales ranging from minutes to years, the former being comparable to and in some cases even shorter than the light-crossing time of the central black hole. The observed gamma-ray lightcurves can be described…

High Energy Astrophysical Phenomena · Physics 2017-07-10 Michael O' Riordan , Asaf Pe'er , Jonathan C. McKinney

Detection of the rapid variability in the Q2237+0305 quasar

Rapid intrinsic variability has been detected for the first time in the Einstein Cross QSO 2237+0305, a radio quiet flat spectrum quasar at z=1.7 that is quadruply lensed by a foreground galaxy at z=0.04. The observed short-period event at…

Astrophysics of Galaxies · Physics 2018-01-18 L. Berdina , V. S. Tsvetkova