Related papers: The Surprising Crab Nebula

Gamma-ray excess from a stacked sample of high- and intermediate-frequency peaked blazars observed with the MAGIC telescope

Between 2004 and 2009 a sample of 28 X-ray selected high- and intermediate-frequency peaked blazars with a X-ray flux larger than 2 uJy at 1 keV in the redshift range from 0.018 to 0.361 was observed with the MAGIC telescope at energies…

High Energy Astrophysical Phenomena · Physics 2011-03-03 MAGIC Collaboration , J. Aleksić , L. A. Antonelli , P. Antoranz , M. Backes , C. Baixeras , J. A. Barrio , D. Bastieri , J. Becerra González , W. Bednarek , A. Berdyugin , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , G. Bonnoli , P. Bordas , D. Borla Tridon , V. Bosch-Ramon , D. Bose , I. Braun , T. Bretz , D. Britzger , M. Camara , E. Carmona , A. Carosi , P. Colin , S. Commichau , J. L. Contreras , J. Cortina , M. T. Costado , S. Covino , F. Dazzi , A. De Angelis , E. De Cea del Pozo , R. De los Reyes , B. De Lotto , M. De Maria , F. De Sabata , C. Delgado Mendez , 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 , N. Godinovic , D. Hadasch , A. Herrero , D. Hildebrand , D. Höhne-Mönch , J. Hose , D. Hrupec , C. C. Hsu , T. Jogler , S. Klepser , T. Krähenbühl , D. Kranich , A. La Barbera , A. Laille , E. Leonardo , E. Lindfors , S. Lombardi , F. Longo , M. López , E Lorenz , P. Majumdar , 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 , M. Moles , A. Moralejo , D. Nieto , K. Nilsson , J. Ninkovic , R. Orito , I. Oya , S. Paiano , R. Paoletti , J. M. Paredes , S. Partini , M. Pasanen , D. Pascoli , F. Pauss , R. G. Pegna , M. A. Perez-Torres , M. Persic , L. Peruzzo , F. Prada , E. Prandini , N. Puchades , I. Puljak , I. Reichardt , W. Rhode , M. Ribó , J. Rico , M. Rissi , S. Rügamer , A. Saggion , 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. C. Struebig , T. Suric , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzic , D. Tescaro , M. Teshima , O. Tibolla , D. F. Torres , H. Vankov , R. M. Wagner , Q. Weitzel , V Zabalza , F. Zandanel , R. Zanin

On the origin of variable gamma-ray emission from the Crab Nebula

The oblique geometry of pulsar wind termination shock ensures that the Doppler beaming has a strong impact on the shock emission. We illustrate this using recent relativistic MHD simulations of the Crab Nebula and also show that the…

High Energy Astrophysical Phenomena · Physics 2015-05-20 S. S. Komissarov , M. Lyutikov

Gamma-ray and Optical properties of the flat spectrum radio quasar 3C 279 flare in June 2015

The flat spectrum radio quasar 3C 279 was observed in an extremely high activity state on June 16, 2015 (MJD 57189). In this paper, we investigate the properties of this flaring episode in the high energy $\gamma$-ray and optical bands…

High Energy Astrophysical Phenomena · Physics 2020-03-05 K K Singh , P J Meintjes , B Bisschoff , F A Ramamonjisoa , B van Soelen

Measurement of the Crab Nebula spectrum over three decades in energy with the MAGIC telescopes

The MAGIC stereoscopic system collected 69 hours of Crab Nebula data between October 2009 and April 2011. Analysis of this data sample using the latest improvements in the MAGIC stereoscopic software provided an unprecedented precision of…

High Energy Astrophysical Phenomena · Physics 2019-08-15 MAGIC Collaboration , J. Aleksić , S. Ansoldi , L. A. Antonelli , P. Antoranz , A. Babic , P. Bangale , J. A. 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 , 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 , D. Fidalgo , 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 , 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 , F. Longo , 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 , V. Neustroev , 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 , J. Poutanen , 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. N. Shore , A. Sillanpää , J. Sitarek , I. Snidaric , D. Sobczynska , F. Spanier , A. Stamerra , T. Steinbring , 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 , P. Vogler , M. Will , R. Zanin , D. Horns , J. Martin , M. Meyer

INTEGRAL observations of the Crab pulsar

The paper presents the timing and spectral analysis of several observations of the Crab pulsar performed with INTEGRAL in the energy range 3-500 keV. All these observations, when summed together provide a high statistics data set which can…

Astrophysics · Physics 2009-11-11 T. Mineo , C. Ferrigno , L. Foschini , A. Segreto , G. Cusumano , G. Malaguti , G. Di Cocco , C. Labanti

The exceptional VHE gamma-ray outburst of PKS 1510-089 in May 2016

PKS 1510-089 (z=0.361) is one of only a handful of flat spectrum radio quasars that have been detected at very high energy (VHE, $E>100\,$GeV) gamma rays. It is a very active source across the entire electromagnetic spectrum. VHE…

High Energy Astrophysical Phenomena · Physics 2020-01-30 Michael Zacharias , Julian Sitarek , Dijana Dominis Prester , Felix Jankowsky , Elina Lindfors , Mahmoud Mohamed , David Sanchez , Tomislav Terzic

Comparison of multiwavelength observations of 9 broad-band pulsars with the spectrum of the emission from an extended current with a superluminally rotating distribution pattern

The observed spectra of 9 pulsars for which multiwavelength data are available from radio to $X$- or $\gamma$-ray bands (Crab, Vela, Geminga, B0656+14, B1055-52, B1509-58, B1706-44, B1929+10, and B1951+32) are compared with the spectrum of…

Astrophysics of Galaxies · Physics 2009-08-11 H. Ardavan , A. Ardavan , J. Singleton , J. Fasel , W. Junor , J. Middleditch , M. R. Perez , A. Schmidt , P. Sengupta , P. Volegov

Scrutinizing the 2020 multiwavelength outburst of PKS 0903-57 through observations with H.E.S.S

The blazar PKS 0903-57 has recently been classified as a flat spectrum radio quasar at a redshift of $z=0.2621$. In March and April 2020, Fermi-LAT and AGILE reported tremendous activity in high-energy $\gamma$ rays with the flux increasing…

High Energy Astrophysical Phenomena · Physics 2026-03-16 A. Acharyya , F. Aharonian , F. Ait Benkhali , A. Alkan , H. Ashkar , M. Backes , V. Barbosa Martins , R. Batzofin , Y. Becherini , D. Berge , K. Bernlöhr , B. Bi , M. Böttcher , C. Boisson , J. Bolmont , J. Borowska , R. Brose , A. Brown , F. Brun , B. Bruno , T. Bulik , C. Burger-Scheidlin , S. Casanova , J. Celic , M. Cerruti , S. Chandra , A. Chen , M. Chernyakova , J. O. Chibueze , O. Chibueze , B. Cornejo , G. Cotter , G. Cozzolongo , J. Damascene Mbarubucyeye , J. de Assis Scarpin , M. de Naurois , E. de Oña Wilhelmi , A. G. Delgado Giler , J. Devin , A. Djannati-Ataï , J. Djuvsland , A. Dmytriiev , V. Doroshenko , K. Egg , S. Einecke , J. -P. Ernenwein , C. Escañuela Nieves , K. Feijen , M. D. Filipovic , G. Fontaine , S. Funk , S. Gabici , Y. A. Gallant , M. Genaro , J. F. Glicenstein , P. Goswami , G. Grolleron , L. Haerer , L. Heckmann , G. Hermann , B. Heß , J. A. Hinton , W. Hofmann , T. L. Holch , M. Holler , D. Horns , M. Jamrozy , F. Jankowsky , I. Jung-Richardt , E. Kasai , K. Katarzyński , D. Kerszberg , R. Khatoon , B. Khélifi , W. Kluźniak , N. Komin , D. Kostunin , R. G. Lang , A. Lemièr , J. -P. Lenain , A. Luashvili , J. Mackey , D. Malyshev , V. Marandon , G. Martí-Devesa , R. Marx , M. Mayer , A. Mehta , A. M. W. Mitchell , R. Moderski , M. O. Moghadam , L. Mohrmann , A. Montanari , E. Moulin , D. Moyeni , J. Niemiec , L. Olivera-Nieto , S. Panny , M. Panter , R. D. Parsons , U. Pensec , S. Pita , G. Pühlhofer , A. Quirrenbach , M. Regeard , A. Reimer , O. Reimer , H. X. Ren , B. Reville , F. Rieger , G. Rowell , B. Rudaka , K. Sabri , V. Sahakiana , H. Salzmann , M. Sasaki , J. Schäfer , F. Schüssler , H. M. Schutte , J. N. S. Shapopi , A. Sharma , W. Si Said , H. Sol , S. Spencer , Ł. Stawarz , R. Steenkamp , S. Steinmassl , C. Steppa , T. Takahashi , T. Tanaka , A. M. Taylor , C. van Eldik , M. Vecchi , J. Vink , T. Wach , S. J. Wagner , A. Wierzcholska , M. Zacharias , A. A. Zdziarski , A. Zech , N. Żywucka

On the spectrum of the pulsed gamma-ray emission from 10MeV to 400GeV of the Crab pulsar

In the present paper a self-consistent theory, interpreting the VERITAS observations of the very high energy pulsed emission from the Crab pulsar is considered. The photon spectrum between 10MeV and 400GeV can be described by two power-law…

High Energy Astrophysical Phenomena · Physics 2012-08-13 Nino Chkheidze , George Machabeli , Zaza Osmanov

Interpreting Crab Nebula synchrotron spectrum: two acceleration mechanisms

We outline a model of the Crab Pulsar Wind Nebula with two different populations of synchrotron emitting particles, arising from two different acceleration mechanisms: (i) Component-I due to Fermi-I acceleration at the equatorial portion of…

High Energy Astrophysical Phenomena · Physics 2019-08-14 Maxim Lyutikov , Tea Temim , Sergey Komissarov , Patrick Slane , Lorenzo Sironi , Luca Comisso

Multifrequency Radio Observations of the Crab Pulsar

Previously unseen profile components of the Crab pulsar have been discovered in a study of the frequency-dependent behavior of its average pulse profile between 0.33 and 8.4 GHz. One new component, 36 degrees ahead of the main pulse at 1.4…

Astrophysics · Physics 2009-10-28 D. A. Moffett , T. H. Hankins

The Crab Nebula's Wisps in Radio and Optical

We present four new, high-resolution VLA radio images of the Crab nebula, taken between 2001 Feb. and Apr. The radio images show systematic variability in the Crab's radio emission throughout the region near the pulsar. The principal…

Astrophysics · Physics 2009-11-10 M. F. Bietenholz , J. J. Hester , D. A. Frail , N. Bartel

What we recently learnt about Crab: structure of the wind, the shock, flares and reconnection

We can probe observationally and reproduce theoretically intricate properties of the Crab Nebula nearest to the pulsar - The Inner Knot. The tiny knot is indeed a bright spot on the surface of a quasi-stationary magnetic relativistic shock…

High Energy Astrophysical Phenomena · Physics 2017-02-01 Maxim Lyutikov

An Exceptional VHE Gamma-Ray Flare of PKS 2155-304

The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.116 is a well-known VHE (>100 GeV) gamma-ray emitter. Since 2002 its VHE flux has been monitored using the H.E.S.S. stereoscopic array of imaging atmospheric-Cherenkov telescopes…

Astrophysics · Physics 2009-12-10 F. Aharonian

First Detection of a Pulsar above 100 GeV

We present the detection of pulsed gamma-ray emission from the Crab Pulsar above 100 GeV with the VERITAS array of atmospheric Cherenkov telescopes. Gamma-ray emission at theses energies is not expected in present pulsar models. We find…

High Energy Astrophysical Phenomena · Physics 2019-08-13 A. Nepomuk Otte

Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017

We present a multiwavelength study of the flat-spectrum radio quasar CTA 102 during 2013-2017. We use radio-to-optical data obtained by the Whole Earth Blazar Telescope, 15 GHz data from the Owens Valley Radio Observatory, 91 and 103 GHz…

High Energy Astrophysical Phenomena · Physics 2019-11-12 F. D'Ammando , C. M. Raiteri , M. Villata , J. A. Acosta-Pulido , I. Agudo , A. A. Arkharov , R. Bachev , G. V. Baida , E. Benitez , G. A. Borman , W. Boschin , V. Bozhilov , M. S. Butuzova , P. Calcidese , M. I. Carnerero , D. Carosati , C. Casadio , N. Castro-Segura , W. -P. Chen , G. Damljanovic , A. Di Paola , J. Echevarria , N. V. Efimova , Sh. A. Ehgamberdiev , C. Espinosa , A. Fuentes , A. Giunta , J. L. Gomez , T. S. Grishina , M. A. Gurwell , D. Hiriart , H. Jermak , B. Jordan , S. G. Jorstad , M. Joshi , G. N. Kimeridze , E. N. Kopatskaya , K. Kuratov , O. M. Kurtanidze , S. O. Kurtanidze , A. Lahteenmaki , V. M. Larionov , E. G. Larionova , L. V. Larionova , C. Lazaro , C. S. Lin , M. P. Malmrose , A. P. Marscher , K. Matsumoto , B. McBreen , R. Michel , B. Mihov , M. Minev , D. O. Mirzaqulov , S. N. Molina , J. W. Moody , D. A. Morozova , S. V. Nazarov , A. A. Nikiforova , M. G. Nikolashvili , J. M. Ohlert , N. Okhmat , E. Ovcharov , F. Pinna , T. A. Polakis , C. Protasio , T. Pursimo , F. J. Redondo-Lorenzo , N. Rizzi , G. Rodriguez-Coira , K. Sadakane , A. C. Sadun , M. R. Samal , S. S. Savchenko , E. Semkov , L. Sigua , B. A. Skiff , L. Slavcheva-Mihova , P. S. Smith , I. A. Steele , A. Strigachev , J. Tammi , C. Thum , M. Tornikoski , Yu. V. Troitskaya , I. S. Troitsky , A. A. Vasilyev , O. Vince , T. Hovatta , S. Kiehlmann , W. Max-Moerbeck , A. C. S. Readhead , R. Reeves , T. J. Pearson , T. Mufakharov , Yu. V. Sotnikova , M. G. Mingaliev

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

Phase-Resolved Studies of the High-Energy Gamma-Ray Emission from the Crab, Geminga, and Vela Pulsars

Using the first three and a half years of observations from the Energetic Gamma Ray Telescope (EGRET) on board the Compton Gamma Ray Observatory (CGRO), phase-resolved analyses are performed on the emission from the three brightest…

Astrophysics · Physics 2008-11-26 J. M. Fierro , P. F. Michelson , P. L. Nolan , D. J. Thompson

Impulsive and Long Duration High-Energy Gamma-ray Emission From the Very Bright 2012 March 7 Solar Flares

The Fermi Large Area Telescope (LAT) observed two bright X-class solar flares on 2012 March 7, and detected gamma-rays up to 4 GeV. We detected gamma-rays both during the impulsive and temporally-extended emission phases, with emission…

High Energy Astrophysical Phenomena · Physics 2017-02-22 LAT collaboration

Fermi-Large Area Telescope observations of the brightest Gamma-ray flare ever detected from CTA 102

We present a multi-wavelength study of the FSRQ CTA 102 using Fermi-LAT and simultaneous Swift-XRT/UVOT observations. The Fermi-LAT telescope detected one of the brightest flares from this object during Sep, 2016 to Mar, 2017. In the 190…

High Energy Astrophysical Phenomena · Physics 2018-10-17 Raj Prince , Gayathri Raman , Joachim Hahn , Nayantara Gupta , Pratik Majumdar