Related papers: X-ray Rapid Variability of MKN 421

Evolution of the synchrotron and inverse Compton emissions of the low energy peaked BL Lac object S5 0716+714

This paper presents a detailed analysis of the temporal and spectral variability of the low-energy peaked BL Lac object S5 0716+714 with a long (~74 ks)X-ray observation performed by XMM-Newton on 2007 September 24-25. The source…

High Energy Astrophysical Phenomena · Physics 2015-05-18 You-Hong Zhang

Gamma-ray and Optical Oscillations of 0716+714, MRK 421, and BL Lac

We examine the 2008-2016 $\gamma$-ray and optical light curves of three bright BL Lac objects, 0716+714, MRK 421, BL Lac, which exhibit large structured variability. We searched for periodicities by using a fully Bayesian approach. For two…

High Energy Astrophysical Phenomena · Physics 2017-04-19 A. Sandrinelli , S. Covino , A. Treves , E. Lindfors , C. M. Raiteri , K. Nilsson , L. O. Takalo , R. Reinthal , A. Berdyugin , V. Fallah Ramazani , V. Kadenius , T. Tuominen , P. Kehusmaa , R. Bachev , A. Strigachev

Temporal and spectral gamma-ray properties of Mkn421 above 250 GeV from CAT observations between 1996 and 2000

The gamma-ray emission above 250 GeV from the BL Lac object Markarian 421 was observed by the CAT Cherenkov imaging telescope between December, 1996, and June, 2000. In 1998, the source produced a series of small flares, making it the…

Astrophysics · Physics 2014-10-13 F. Piron , A. Djannati-Atai , M. Punch , J. -P. Tavernet , A. Barrau , R. Bazer-Bachi , L. -M. Chounet , G. Debiais , B. Degrange , J. -P. Dezalay , P. Espigat , B. Fabre , P. Fleury , G. Fontaine , P. Goret , C. Gouiffes , B. Khelifi , I. Malet , C. Masterson , G. Mohanty , E. Nuss , C. Renault , M. Rivoal , L. Rob , S. Vorobiov

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

Microvariability Detection of Mrk 421

The BL Lac object Mrk 421 was observed in optical bands from 2009 April to 2012 May with the 1.0 m telescope at Weihai Observatory of Shandong University. Microvariability was analysed by C and F tests, but no significant microvariability…

High Energy Astrophysical Phenomena · Physics 2015-06-18 Xu Chen , ShaoMing Hu , DiFu Guo

Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system

Since its commissioning in fall 1996, the stereoscopic system of Imaging Atmospheric Cherenkov Telescope (IACTs) of HEGRA with an energy threshold of 500 GeV, an angular resolution of 0.1 degree and an energy resolution of 20% per…

Astrophysics · Physics 2007-05-23 F. A. Aharonian

The Long Term Optical Variability of the BL Lac object S5 0716+714: Evidence for a Precessing Jet

We present the historic light curve of the BL Lac object S5 0716+714, spanning the time interval from 1953 to 2003, built using Asiago archive plates and our recent CCD observations, together with literature data. The source shows an…

Astrophysics · Physics 2008-11-26 R. Nesci , E. Massaro , C. Rossi , S. Sclavi , M. Maesano , F. Montagni

Kepler observations of rapid optical variability in the BL Lac object W2R1926+42

We present the first Kepler monitoring of a strongly variable BL Lac, W2R1926+42. The light curve covers 181 days with ~0.2% errors, 30 minute sampling and >90% duty cycle, showing numerous delta I/I > 25% flares over timescales as short as…

High Energy Astrophysical Phenomena · Physics 2014-09-08 R. Edelson , R. Mushotzky , S. Vaughan , J. Scargle , P. Gandhi , M. Malkan , W. Baumgartner

Rapid variability of BL Lacs and time lags: what can we learn?

The quasi-symmetric shape of the lightcurves, as seen in the X-rays and in the optical, together with the fast variations of the flux observed, suggest that the cooling time for the highest energy electrons may be shorter than the light…

Astrophysics · Physics 2007-05-23 Marco Chiaberge , Annalisa Celotti , Gabriele Ghisellini

Multiwavelength variability and correlation studies of Mrk 421 during historically low X-ray and $\gamma$-ray activity in 2015$-$2016

We report a characterization of the multi-band flux variability and correlations of the nearby (z=0.031) blazar Markarian 421 (Mrk 421) using data from Mets\"{a}hovi, Swift, Fermi-LAT, MAGIC, FACT and other collaborations and instruments…

High Energy Astrophysical Phenomena · Physics 2021-05-26 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , K. Asano , A. Babić , B. Banerjee , A. Baquero , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , L. Bellizzi , E. Bernardini , M. Bernardos , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , O. Blanch , G. Bonnoli , Ž. Bošnjak , G. Busetto , R. Carosi , G. Ceribella , M. Cerruti , Y. Chai , A. Chilingarian , S. Cikota , S. M. Colak , 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 , M. Delfino , J. Delgado , C. Delgado Mendez , D. Depaoli , T. Di Girolamo , F. Di Pierro , L. Di Venere , E. Do Souto Espiñeira , D. Dominis Prester , A. Donini , M. Doro , V. Fallah Ramazani , A. Fattorini , G. Ferrara , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , P. Gliwny , N. Godinović , J. G. Green , D. Green , D. Hadasch , A. Hahn , L. Heckmann , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , J. Jormanainen , L. Jouvin , Y. Kajiwara , M. Karjalainen , D. Kerszberg , Y. Kobayashi , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , A. López-Oramas , S. Loporchio , B. Machado de Oliveira Fraga , C. Maggio , P. Majumdar , M. Makariev , M. Mallamaci , G. Maneva , M. Manganaro , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , S. Mender , S. Mićanović , D. Miceli , T. Miener , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , P. Munar-Adrover , V. Neustroev , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , S. Nozaki , Y. Ohtani , T. Oka , J. Otero-Santos , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , L. Pavletić , P. Peñil , C. Perennes , M. Persic , P. G. Prada Moroni , E. Prandini , C. Priyadarshi , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , B. Schleicher , K. Schmidt , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Spolon , A. Stamerra , D. Strom , M. Strzys , Y. Suda , T. Surić , M. Takahashi , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albà , L. Tosti , S. Truzzi , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , S. Ventura , V. Verguilov , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , D. Zarić , FACT collaboration , : , A. Arbet-Engels , D. Baack , M. Balbo , M. Beck , N. Biederbeck , A. Biland , T. Bretz , K. Bruegge , J. Buss , D. Dorner , D. Elsaesser , D. Hildebrand , R. Iotov , M. Klinger , K. Mannheim , D. Neise , A. Neronov , M. Noethe , A. Paravac , W. Rhode , B. Schleicher , V. Sliusar , F. Theissen , R. Walter , MWL Collaborators , : , J. Valverde , D. Horan , M. Giroletti , M. Perri , F. Verrecchia , C. Leto , A. C. Sadun , J. W. Moody , M. Joner , A. P. Marscher , S. G. Jorstad , A. Lähteenmäki , M. Tornikoski , V. Ramakrishnan , E. Järvelä , R. J. C. Vera , S. Righini , A. Y. Lien

Dissecting the long-term emission behaviour of the BL Lac object Mrk 421

We report on long-term multi-wavelength monitoring of blazar Mrk 421 by the GASP-WEBT collaboration and Steward Observatory, and by the Swift and Fermi satellites. We study the source behaviour in the period 2007-2015, characterized by…

High Energy Astrophysical Phenomena · Physics 2019-08-14 M. I. Carnerero , C. M. Raiteri , M. Villata , J. A. Acosta-Pulido , V. M. Larionov , P. S. Smith , F. D'Ammando

Rapid X-ray Variability in Mkn 421 during a Multiwavelength Campaign

The study of short-term variability properties in AGN jets has the potential to shed light on their particle acceleration and emission mechanisms. We report results from a four-day coordinated multi-wavelength campaign on the highly-peaked…

High Energy Astrophysical Phenomena · Physics 2022-06-09 Alex G. Markowitz , Krzysztof Nalewajko , Gopal Bhatta , Gulab C. Dewangan , Sunil Chandra , Daniela Dorner , Bernd Schleicher , Urszula Pajdosz-Smierciak , Lukasz Stawarz , Staszek Zola , Michal Ostrowski , Daniele Carosati , Saikruba Krishnan , Rumen Bachev , Erika Benitez , Kosmas Gazeas , David Hiriart , Shao-Ming Hu , Valeri Larionov , Alessandro Marchini , Katsura Matsumoto , A. A. Nikiforova , Tapio Pursimo , Claudia M. Raiteri , Daniel E. Reichart , Diego Rodriguez , Evgeni Semkov , Anton Strigachev , Yuki Sugiura , Massimo Villata , James R. Webb , Axel Arbet-Engels , Dominik Baack , Matteo Balbo , Adrian Biland , Thomas Bretz , Jens Buss , Laura Eisenberger , Dominik Elsaesser , Dorothee Hildebrand , Roman Iotov , Adelina Kalenski , Karl Mannheim , Alison Mitchell , Dominik Neise , Maximilian Noethe , Aleksander Paravac , Wolfgang Rhode , Vitalii Sliusar , Roland Walter

Rapid Variability of Mrk 421 During Extreme Flaring as Seen Through the Eyes of XMM-Newton

By studying the variability of blazars across the electromagnetic spectrum, it is possible to resolve the underlying processes responsible for rapid flux increases, so-called flares. We report on an extremely bright X-ray flare in the…

High Energy Astrophysical Phenomena · Physics 2024-03-01 A. Gokus , J. Wilms , M. Kadler , D. Dorner , M. A. Nowak , A. Kreikenbohm , K. Leiter , T. Bretz , B. Schleicher , A. G. Markowitz , K. Pottschmidt , K. Mannheim , I. Kreykenbohm , M. Langejahn , F. McBride , T. Beuchert , T. Dauser , M. Kreter , J. Abhir , D. Baack , M. Balbo , A. Biland , K. Brand , J. Buss , L. Eisenberger , D. Elsaesser , P. Guenther , D. Hildebrand , M. Linhoff , A. Paravac , W. Rhode , V. Sliusar , S. Hasan , R. Walter

A full orbit XMM-Newton observation of PKS 2155-304

XMM observed the BL Lac PKS 2155-304 for a full orbit (about 150 ksec) on 2000 November 19-21. Preliminary results on the temporal and spectral analysis of data from the EPIC PN camera and Optical Monitor are presented. The variability…

Astrophysics · Physics 2007-05-23 L. Maraschi , F. Tavecchio , I. Cagnoni , Y-H. Zhang , L. Chiappetti , A. Treves , A. Celotti , L. Costamante , R. Edelson , G. Fossati , G. Ghisellini , E. Pian , S. Sembay , G. Tagliaferri , C. M. Urry

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

Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304 in May 1994. I. The Ground-Based Campaign

Optical, near-infrared, and radio observations of the BL Lac object PKS2155-304 were obtained simultaneously with a continuous UV/EUV/X-ray monitoring campaign in 1994 May. Further optical observations were gathered throughout most of 1994.…

Astrophysics · Physics 2009-10-30 J. E. Pesce , C. M. Urry , L. Maraschi , A. Treves , P. Grandi , R. Kollgaard , E. Pian , P. Smith , H. Aller M. Aller , A. Barth , D. Buckley , E. Covino , A. Filippenko , E. Hooper , M. Joner L. Kedziora-Chudczer , D. Kilkenny , L. Knee , M. Kunkel , A. Layden , A. Magalhaes , F. Marang , V. Margoniner , C. Palma , A. Pereyra , C. Rodrigues , A. Schutte , M. Sitko , M. Tornikoski , J. van der Walt , F. van Wyk , P. Whitelock , S. Wolk

Four Years Monitoring of Blazar PKS 2155-304 with BeppoSAX: Probing the Dynamics of the Jet

PKS 2155--304 is one of the brightest blazars in the X-ray band. It was repeatedly monitored with BeppoSax during three long campaigns of about 2 days each in November of 1996, 1997 and 1999. The source underwent different states of…

Astrophysics · Physics 2009-11-07 Y. H. Zhang , A. Treves , A. Celotti , L. Chiappetti , G. Fossati , G. Ghisellini , L. Maraschi , E. Pian , G. Tagliaferri , F. Tavecchio

Blazar Variability: A Study of Non-stationarity and the Flux-RMS Relation

We analyze X-ray light curves of the blazars Mrk 421, PKS 2155-304, and 3C 273 using observations by the Soft X-ray Telescope on board AstroSat and archival XMM-Newton data. We use light curves of length 30-90 ks each from 3-4 epochs for…

High Energy Astrophysical Phenomena · Physics 2023-10-27 Joy Bhattacharyya , Ritesh Ghosh , Ritaban Chatterjee , Nabanita Das

The complex time behaviour of the microquasar GRS 1915+105 in the \rho-class observed with BeppoSAX. III: The hard X-ray delay and limit cycle mapping

The microquasar GRS1915+105 was observed by BeppoSAX in October 2000 for about ten days while the source was in \rho-mode, which is characterized by a quasi-regular type I bursting activity. This paper presents a systematic analysis of the…

High Energy Astrophysical Phenomena · Physics 2013-07-02 F. Massa , E. Massaro , T. Mineo , A. D'Aì , M. Feroci , P. Casella , T. Belloni

Mrk421: EUVE observations from 1994 to 1997

We present spectral and timing analysis of all the data collected by the Extreme Ultraviolet Explorer for the BL Lac object Mrk 421 from 1994 to 1997. During these years Mrk 421 has been observed by EUVE 4 times with the DS/Spectrograph and…

Astrophysics · Physics 2007-05-23 Ilaria Cagnoni , Antonella Fruscione , Iossif E. Papadakis