Related papers: The TeV blazar Markarian 421 at the highest spatia…

FACT -- Multi-wavelength analysis of more than 30 flares of Mrk 421

Mrk 421 is a high-synchrotron-peaked blazar featuring bright and persistent GeV and TeV emission. We use multi-wavelength light curves of Mrk 421 spanning 5.5 years with FACT (TeV) and Fermi LAT (GeV) in the gamma rays, Swift BAT, Swift XRT…

High Energy Astrophysical Phenomena · Physics 2019-08-27 Vitalii Sliusar , Axel Arbet-Engels , Dominik Baack , Matteo Balbo , Adrian Biland , Michael Blank , Tomas Bretz , Kai Bruegge , Michael Bulinski , Jens Buss , Manuel Doerr , Daniela Dorner , Dominik Elsaesser , Dorothee Hildebrand , Karl Mannheim , Sebastian mueller , Dominik Neise , Maximilian Noethe , Aleksander Paravac , Wolfgang Rhode , Bernd Schleicher , Kevin Sedlaczek , Amit Shukla , Roland Walter , Elan von Willert

Gamma-ray light curve and VLBI polarization connection in Mrk 421

We present Fermi-LAT and multi-frequency, multi-epoch VLBA data for the TeV blazar Mrk421. We collected the data during a long and intensive multi-frequency campaign in 2011. We study the gamma-ray light curve, the photon index evolution…

High Energy Astrophysical Phenomena · Physics 2019-08-14 M. Giroletti , F. D'Ammando , M. Orienti , D. Paneque , R. Lico , G. Giovannini , J. L. Gómez , S. Jorstad , A. Marscher

Multiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/TeV Correlated Variability

(Abridged) We present a detailed analysis of week-long simultaneous observations of the blazar Mrk421 at 2-60 keV X-rays (RXTE) and TeV gamma-rays (Whipple and HEGRA) in 2001. The unprecedented quality of this dataset enables us to…

Astrophysics · Physics 2008-06-16 G. Fossati , J. H. Buckley , I. H. Bond , S. M. Bradbury , D. A. Carter-Lewis , Y. C. K. Chow , W. Cui , A. D. Falcone , J. P. Finley , J. A. Gaidos , J. Grube , J. Holder , D. Horan , D. Horns , M. M. Jordan , D. B. Kieda , J. Kildea , H. Krawczynski , F. Krennrich , M. J. Lang , S. LeBohec , K. Lee , P. Moriarty , R. A. Ong , D. Petry , J. Quinn , G. H. Sembroski , S. P. Wakely , T. C. Weekes

VLBA monitoring of Mrk 421 at 15 and 24 GHz during 2011

We present a preliminary analysis of new high resolution radio observations of the nearby TeV blazar Markarian 421 (z=0.031). This study is part of an ambitious multifrequency campaign, with observations in sub-mm (SMA), optical/IR (GASP),…

High Energy Astrophysical Phenomena · Physics 2012-05-03 R. Lico , M. Giroletti , M. Orienti , G. Giovannini , B. Cotton , P. Edwards , L. Fuhrmann , T. Krichbaum , K. Sokolovsky , S. Jorstad , A. Marscher , M. Kino , Y. Kovalev , D. Paneque , M. A. Perez-Torres , G. Piner

Measurement of the Multi-TeV gamma-ray Flare-Spectra of Markarian 421 and Markarian 501

The energy spectrum of Markarian~421 in flaring states has been measured from 0.3 to 10 TeV using both small zenith angle and large zenith angle observations with the Whipple Observatory 10 m imaging telescope. The large zenith angle…

Astrophysics · Physics 2009-10-30 F. Krennrich , S. D. Biller

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

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

First Results from NuSTAR Observations of Mkn 421

Mkn 421 is a nearby active galactic nucleus dominated at all wavelengths by a very broad non-thermal continuum thought to arise from a relativistic jet seen at a small angle to the line of sight. Its spectral energy distribution peaks in…

High Energy Astrophysical Phenomena · Physics 2015-06-17 M. Baloković , M. Ajello , R. D. Blandford , S. E. Boggs , F. Borracci , J. Chiang , F. E. Christensen , W. W. Craig , K. Forster , A. Furniss , F. Fuerst , G. Ghisellini , B. Giebels , P. Giommi , B. W. Grefenstette , C. J. Hailey , F. A. Harrison , M. Hayashida , B. Humensky , Y. Inoue , J. E. Koglin , H. Krawczynski , G. M. Madejski , K. K. Madsen , D. L. Meier , T. Nelson , P. Ogle , D. Paneque , M. Perri , S. Puccetti , C. S. Reynolds , T. Sbarrato , D. Stern , G. Tagliaferri , C. M. Urry , A. E. Wehrle , W. W. Zhang

Mrk 421 active state in 2008: the MAGIC view, simultaneous multi-wavelength observations and SSC model constrained

Context: The blazar Markarian 421 is one of the brightest TeV gamma-ray sources of the northern sky. From December 2007 until June 2008 it was intensively observed in the very high energy (VHE, E > 100 GeV) band by the single-dish Major…

High Energy Astrophysical Phenomena · Physics 2015-05-28 J. Aleksic , E. A. Alvarez , L. A. Antonelli , P. Antoranz , M. Asensio , M. Backes , J. A. Barrio , D. Bastieri , J. Becerra Gonzalez , W. Bednarek , A. Berdyugin , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , A. Boller , G. Bonnoli , D. Borla Tridon , I. Braun , T. Bretz , A. Canellas , E. Carmona , A. Carosi , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , L. Cossio , S. Covino , F. Dazzi , A. De Angelis , G. De Caneva , E. De Cea del Pozo , B. De Lotto , C. Delgado Mendez , A. Diago Ortega , M. Doert , A. Dominguez , D. Dominis Prester , D. Dorner , M. Doro , D. Elsaesser , D. Ferenc , M. V. Fonseca , L. Font , C. Fruck , R. J. Garcia Lopez , M. Garczarczyk , D. Garrido , G. Giavitto , N. Godinovic , D. Hadasch , D. Häfner , A. Herrero , D. Hildebrand , D. Höhne-Mönch , J. Hose , D. Hrupec , B. Huber , T. Jogler , H. Kellermann , S. Klepser , T. Krahenbuh , J. Krause , A. La Barbera , D. Lelas , E. Leonardo , E. Lindfors , S. Lombardi , A. Lopez , M. Lopez , E. Lorenz , M. Makariev , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , M. Mariotti , M. Martinez , D. Mazin , M. Meucci , J. M. Miranda , R. Mirzoyan , H. Miyamoto , J. Moldon , A. Moralejo , P. Munar-Adrover , D. Nieto , K. Nilsson , R. Orito , I. Oya , D. Paneque , R. Paoletti , S. Pardo , J. M. Paredes , S. Partini , M. Pasanen , F. Pauss , M. A. Perez-Torres , M. Persic , L. Peruzzo , M. Pilia , J. Pochon , F. Prada , P. G. Prada Moroni , E. Prandini , I. Puljak , I. Reichardt , R. Reinthal , W. Rhode , M. Ribo , J. Rico , S. Rügamer , A. Saggion , K. Saito , T. Y. Saito , M. Salvati , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , M. Shayduk , S. N. Shore , A. Sillanpaa , J. Sitarek , D. Sobczynska , F. Spanier , S. Spiro , A. Stamerra , B. Steinke , J. Storz , N. Strah , T. Suric , L. Takalo , H. Takami , F. Tavecchio , P. Temnikov , T. Terzic , D. Tescaro , M. Teshima , O. Tibolla , D. F. Torres , A. Treves , M. Uellenbeck , H. Vankov , P. Vogler , R. M. Wagner , Q. Weitzel , V. Zabalza , F. Zandanel , R. Zanin

Observation of Markarian 421 in TeV gamma rays over a 14-year time span

The variability of the blazar Markarian 421 in TeV gamma rays over a 14-year time period has been explored with the Whipple 10 m telescope. It is shown that the dynamic range of its flux variations is large and similar to that in X-rays. A…

High Energy Astrophysical Phenomena · Physics 2015-06-17 V. A. Acciari , T. Arlen , T. Aune , W. Benbow , R. Bird , A. Bouvier , S. M. Bradbury , J. H. Buckley , V. Bugaev , I. de la Calle Perez , D. A. Carter-Lewis , A. Cesarini , L. Ciupik , E. Collins-Hughes , M. P. Connolly , W. Cui , C. Duke , J. Dumm , A. Falcone , S. Federici , D. J. Fegan , S. J. Fegan , J. P. Finley , G. Finnegan , L. Fortson , J. Gaidos , N. Galante , D. Gall , K. Gibbs , G. H. Gillanders , S. Griffin , J. Grube , G. Gyuk , D. Hanna , D. Horan , T. B. Humensky , P. Kaaret , M. Kertzman , Y. Khassen , D. Kieda , H. Krawczynski , F. Krennrich , M. J. Lang , J. E. McEnery , A. S. Madhavan , P. Moriarty , T. Nelson , A. O'Faoláin de Bhróithe , R. A. Ong , M. Orr , A. N. Otte , J. S. Perkins , D. Petry , A. Pichel , M. Pohl , J. Quinn , K. Ragan , P. T. Reynolds , E. Roache , A. Rovero , M. Schroedter , G. H. Sembroski , A. Smith , I. Telezhinsky , M. Theiling , J. Toner , J. Tyler , A. Varlotta , M. Vivier , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , R. Welsing , D. A. Williams , S. Wissel

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

Monitoring of bright blazars with MAGIC telescope

Blazars, a class of Active Galactic Nuclei (AGN) characterized by a close orientation of their relativistic outflows (jets) towards the line of sight, are a well established extragalactic TeV $\gamma$-ray emitters. Since 2006, three nearby…

Cosmology and Nongalactic Astrophysics · Physics 2009-07-07 C. C. Hsu , K. Satalecka , M. Thom , M. Backes , E. Bernardini , G. Bonnoli , N. Galante , F. Goebel , E. Lindfors , P. Majumdar , A. Stamerra , R. M. Wagner

Multiwavelength Observations of the Blazar Mrk 421 in December 2002 and January 2003

We report on a multiwavelength campaign on the TeV gamma-ray blazar Markarian (Mrk) 421 performed during December 2002 and January 2003. These target of opportunity observations were initiated by the detection of X-ray and TeV gamma-ray…

Astrophysics · Physics 2019-08-15 P. Rebillot , M. Aller , H. Aller , P. Boltwood , I. Jung , D. Kranich , A. Sillanpaa , A. Sadun

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

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 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

TeV flaring activity of the AGN PKS 0625-354 in November 2018

Most $\gamma$-ray detected active galactic nuclei are blazars with one of their relativistic jets pointing towards the Earth. Only a few objects belong to the class of radio galaxies or misaligned blazars. Here, we investigate the nature of…

High Energy Astrophysical Phenomena · Physics 2024-01-17 H. E. S. S. Collaboration , F. Aharonian , F. Ait Benkhali , J. Aschersleben , H. Ashkar , M. Backes , A. Baktash , V. Barbosa Martins , J. Barnard , R. Batzofin , Y. Becherini , D. Berge , K. Bernlöhr , B. Bi , M. Böttcher , C. Boisson , J. Bolmont , M. de Bony de Lavergne , J. Borowska , F. Bradascio , M. Breuhaus , R. Brose , A. Brown , F. Brun , B. Bruno , T. Bulik , C. Burger-Scheidlin , T. Bylund , S. Caroff , S. Casanova , R. Cecil , J. Celic , M. Cerruti , T. Chand , S. Chandra , A. Chen , J. Chibueze , O. Chibueze , G. Cotter , J. Damascene Mbarubucyeye , I. D. Davids , J. Djuvsland , A. Dmytriiev , V. Doroshenko , K. Egberts , S. Einecke , J. -P. Ernenwein , G. Fontaine , M. Füßling , S. Funk , S. Gabici , S. Ghafourizadeh , G. Giavitto , D. Glawion , J. F. Glicenstein , J. Glombitza , P. Goswami , G. Grolleron , L. Haerer , J. A. Hinton , T. L. Holch , M. Holler , D. Horns , M. Jamrozy , F. Jankowsky , V. Joshi , I. Jung-Richardt , E. Kasai , K. Katarzyński , R. Khatoon , B. Kh'elifi , z , niak , Nu. Komin , K. Kosack , D. Kostunin , R. G. Lang , S. Le Stum , F. Leitl , A. Lemière , J. -P. Lenain , F. Leuschner , A. Luashvili , J. Mackey , R. Marx , A. Mehta , M. Meyer , A. Mitchell , R. Moderski , A. Montanari , E. Moulin , M. de Naurois , J. Niemiec , P. O'Brien , S. Ohm , L. Olivera-Nieto , E. de Ona Wilhelmi , M. Ostrowski , S. Panny , R. D. Parsons , S. Pita , D. A. Prokhorov , G. Pühlhofer , M. Punch , A. Quirrenbach , P. Reichherzer , A. Reimer , O. Reimer , H. Ren , F. Rieger , B. Rudak , V. Sahakian , H. Salzmann , D. A. Sanchez , M. Sasaki , F. Schüssler , H. M. Schutte , J. N. S. Shapopi , H. Sol , A. Specovius , S. Spencer , L. , Stawarz , R. Steenkamp , S. Steinmassl , K. Streil , I. Sushch , H. Suzuki , T. Takahashi , T. Tanaka , C. van Eldik , M. Vecchi , J. Veh , C. Venter , S. J. Wagner , A. Wierzcholska , M. Zacharias , D. Zargaryan , A. A. Zdziarski , A. Zech , S. Zouari , N. Żywucka

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

Observations of Mkn 421 with the MAGIC Telescope

The MAGIC telescope took data of very high energy gamma-ray emission from the blazar Markarian 421 (Mkn 421) between November 2004 and April 2005. We present a combined analysis of data samples recorded under different observational…

Astrophysics · Physics 2008-11-26 J. Albert et al.

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