Related papers: TeV Gamma-Ray Emission Observed from Geminga with …

Monitoring radio galaxies at TeV energies with HAWC

With an instantaneous field of view of 2 sr and a duty cycle > 95%, the High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory is a perfect instrument for monitoring variable TeV sources. Because radio galaxies are a type of Active…

High Energy Astrophysical Phenomena · Physics 2019-09-04 Daniel Avila Rojas , Rubén Alfaro , M. Magdalena González , Nissim Fraija

Detailed study of extended gamma-ray morphology in the vicinity of the Coma cluster with Fermi-LAT

Galaxy clusters can be sources of high-energy (HE) $\gamma$-ray radiation, due to the efficient acceleration of particles exceeding EeV energies. At present, though, the only candidate for emitting HE $\gamma$-rays is the Coma cluster,…

High Energy Astrophysical Phenomena · Physics 2022-08-24 Vardan Baghmanyan , Davit Zargaryan , Felix Aharonian , Ruizhi Yang , Sabrina Casanova , Jonathan Mackey

Chandra View of the Unidentified TeV Gamma-ray Source HESS J1804-216

We present high-resolution X-ray images taken with the Chandra X-ray Observatory of the field that contains the unidentified TeV gamma-ray source HESS J1804-216. A total of eleven discrete sources were detected with a posteriori…

Astrophysics · Physics 2009-11-11 Wei Cui , Alexander Konopelko

Potential PeVatron supernova remnant G106.3+2.7 seen in the highest-energy gamma rays

Cosmic rays (protons and other atomic nuclei) are believed to gain energies of petaelectronvolts (PeV) and beyond at astrophysical particle accelerators called 'PeVatrons' inside our Galaxy. Although a characteristic feature of a PeVatron…

High Energy Astrophysical Phenomena · Physics 2021-09-08 M. Amenomori , Y. W. Bao , X. J. Bi , D. Chen , T. L. Chen , W. Y. Chen , Xu Chen , Y. Chen , Cirennima , S. W. Cui , Danzengluobu , L. K. Ding , J. H. Fang , K. Fang , C. F. Feng , Zhaoyang Feng , Z. Y. Feng , Qi Gao , Q. B. Gou , Y. Q. Guo , Y. Y. Guo , H. H. He , Z. T. He , K. Hibino , N. Hotta , Haibing Hu , H. B. Hu , J. Huang , H. Y. Jia , L. Jiang , H. B. Jin , K. Kasahara , Y. Katayose , C. Kato , S. Kato , K. Kawata , W. Kihara , Y. Ko , M. Kozai , Labaciren , G. M. Le , A. F. Li , H. J. Li , W. J. Li , Y. H. Lin , B. Liu , C. Liu , J. S. Liu , M. Y. Liu , W. Liu , Y. -Q. Lou , H. Lu , X. R. Meng , K. Munakata , H. Nakada , Y. Nakamura , H. Nanjo , M. Nishizawa , M. Ohnishi , T. Ohura , S. Ozawa , X. L. Qian , X. B. Qu , T. Saito , M. Sakata , T. K. Sako , J. Shao , M. Shibata , A. Shiomi , H. Sugimoto , W. Takano , M. Takita , Y. H. Tan , N. Tateyama , S. Torii , H. Tsuchiya , S. Udo , H. Wang , H. R. Wu , L. Xue , Y. Yamamoto , Z. Yang , Y. Yokoe , A. F. Yuan , L. M. Zhai , H. M. Zhang , J. L. Zhang , X. Zhang , X. Y. Zhang , Y. Zhang , Yi Zhang , Ying Zhang , S. P. Zhao , Zhaxisangzhu , X. X. Zhou

Strong support for the millisecond pulsar origin of the Galactic center GeV excess

Using gamma-ray data from the Fermi Large Area Telescope, various groups have identified a clear excess emission in the Inner Galaxy, at energies around a few GeV. This excess resembles remarkably well a signal from dark-matter…

High Energy Astrophysical Phenomena · Physics 2016-03-10 Richard Bartels , Suraj Krishnamurthy , Christoph Weniger

Teraelectronvolt emission from the $\gamma$-ray burst GRB 190114C

Gamma-ray bursts (GRBs) of the long-duration class are the most luminous sources of electromagnetic radiation known in the Universe. They are generated by outflows of plasma ejected at near the speed of light by newly formed neutron stars…

High Energy Astrophysical Phenomena · Physics 2020-06-15 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , D. Baack , A. Babić , B. Banerjee , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , L. Bellizzi , E. Bernardini , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , A. Biland , O. Blanch , G. Bonnoli , Ž. Bošnjak , G. Busetto , A. Carosi , R. Carosi , G. Ceribella , Y. Chai , A. Chilingaryan , S. Cikota , S. M. Colak , U. Colin , 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 , D. Depaoli , F. Di Pierro , L. Di Venere , E. Do Souto Espiñeira , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , V. Fallah Ramazani , A. Fattorini , A. Fernández-Barral , G. Ferrara , D. Fidalgo , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , S. Gallozzi , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , N. Godinović , D. Green , D. Guberman , D. Hadasch , A. Hahn , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , L. Jouvin , D. Kerszberg , 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 , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , S. Masuda , D. Mazin , S. Mićanović , D. Miceli , 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 , L. Nogués , M. Nöthe , S. Nozaki , S. Paiano , J. Palacio , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , P. Peñil , M. Peresano , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , K. Schmidt , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Somero , 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. Tsujimoto , V. Vagelli , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , D. Zarić , L. Nava

GeV emission in the region of HESS J1809-193 and HESS J1813-178: is HESS J1809-193 a proton pevatron?

HESS J1809-193 is an unidentified TeV source discovered by the High Energy Stereoscopic System and originally classified as a pulsar wind nebula (PWN) candidate associated with the pulsar PSR J1809-1917. However, a recent study of deep…

High Energy Astrophysical Phenomena · Physics 2018-06-06 Miguel Araya

A Measurement of the Spatial Distribution of Diffuse TeV Gamma Ray Emission from the Galactic Plane with Milagro

Diffuse $\gamma$-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its…

Astrophysics · Physics 2014-11-18 A. A. Abdo , B. Allen , T. Aune , D. Berley , E. Blaufuss , S. Casanova , C. Chen , B. L. Dingus , R. W. Ellsworth , L. Fleysher , R. Fleysher , M. M. Gonzalez , J. A. Goodman , C. M. Hoffman , P. H. H"untemeyer , B. E. Kolterman , C. P. Lansdell , J. T. Linnemann , J. E. McEnery , A. I. Mincer , I. V. Moskalenko , P. Nemethy , D. Noyes , T. A. Porter , J. Pretz , J. M. Ryan , P. M. Saz Parkinson , A. Shoup , G. Sinnis , A. J. Smith , A. W. Strong , G. W. Sullivan , V. Vasileiou , G. P. Walker , D. A. Williams , G. B. Yodh

MeV-GeV Gamma-ray Emission from SNR G327.1-1.1 Discovered by the Fermi-LAT

We report the discovery of MeV-GeV gamma-ray emission by the Fermi-LAT positionally coincident with the TeV pulsar wind nebula (PWN) HESS~J1554-550 within the host supernova remnant (SNR) G327.1-1.1. The gamma-ray emission is point-like and…

High Energy Astrophysical Phenomena · Physics 2022-12-07 Jordan Eagle , Daniel Castro , Tea Temim , Jean Ballet , Patrick Slane , Joseph Gelfand , Matthew Kerr , Marco Ajello

Searching for X-Ray Counterparts of Degree Wide TeV Halos Around Middle-Aged Pulsars with SRG/eROSITA

Context. Extended gamma-ray TeV emission (TeV halos) around middle-aged pulsars has been detected. A proposed model to explain these TeV halos is that electrons from a degree-wide Pulsar Wind Nebula (PWN) get up-scattered by cosmic…

High Energy Astrophysical Phenomena · Physics 2023-10-17 A. Khokhriakova , W. Becker , G. Ponti , M. Sasaki , B. Li , R. -Y. Liu

TeV gamma rays from the Galactic Center

The recent detection of TeV gamma-radiation from the direction of the Galactic Center within several arc-minutes around Sgr A* is the first model-independent evidence of existence of high energy particle accelerator(s) in the central 10 pc…

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

First HAWC Spectra of Galactic Gamma-ray Sources Above 100 TeV and the Implications for Cosmic-ray Acceleration

We present the first catalogs of the highest-energy (above 56 TeV and 100 TeV) gamma-ray sources seen by the High Altitude Water Cherenkov (HAWC) Observatory. The wide field-of-view of HAWC naturally lends itself to unbiased all-sky surveys…

High Energy Astrophysical Phenomena · Physics 2019-08-21 Kelly Malone

The diffuse GeV-TeV $\gamma$-ray emission of the Cygnus region

Recently the Milagro experiment observed diffuse multi-TeV gamma-ray emission in the Cygnus region, which is significantly stronger than what predicted by the Galactic cosmic ray model. However, the sub-GeV observation by EGRET shows no…

Astrophysics · Physics 2009-06-23 Xiao-Jun Bi , Tian-Lu Chen , Yue Wang , Qiang Yuan

Numerical modelling of gamma-ray emission produced by electrons originating from the magnetospheres of millisecond pulsars in globular clusters

Globular clusters are source of gamma-ray radiation. At GeV energies, their emission is attributed to magnetospheric activity of millisecond pulsars residing in the clusters. Inverse Compton scattering of ambient photon fields on…

High Energy Astrophysical Phenomena · Physics 2013-05-22 A. Zajczyk , W. Bednarek , B. Rudak

Observation of gamma rays up to 320 TeV from the middle-aged TeV pulsar wind nebula HESS J1849$-$000

Gamma rays from HESS J1849$-$000, a middle-aged TeV pulsar wind nebula (PWN), are observed by the Tibet air shower array and the muon detector array. The detection significance of gamma rays reaches $4.0\, \sigma$ and $4.4\, \sigma$ levels…

High Energy Astrophysical Phenomena · Physics 2023-09-29 M. Amenomori , S. Asano , Y. W. Bao , X. J. Bi , D. Chen , T. L. Chen , W. Y. Chen , Xu Chen , Y. Chen , Cirennima , S. W. Cui , Danzengluobu , L. K. Ding , J. H. Fang , K. Fang , C. F. Feng , Zhaoyang Feng , Z. Y. Feng , Qi Gao , A. Gomi , Q. B. Gou , Y. Q. Guo , Y. Y. Guo , Y. Hayashi , H. H. He , Z. T. He , K. Hibino , N. Hotta , Haibing Hu , H. B. Hu , K. Y. Hu , J. Huang , H. Y. Jia , L. Jiang , P. Jiang , H. B. Jin , K. Kasahara , Y. Katayose , C. Kato , S. Kato , I. Kawahara , T. Kawashima , K. Kawata , M. Kozai , D. Kurashige , Labaciren , G. M. Le , A. F. Li , H. J. Li , W. J. Li , Y. Li , Y. H. Lin , B. Liu , C. Liu , J. S. Liu , L. Y. Liu , M. Y. Liu , W. Liu , H. Lu , X. R. Meng , Y. Meng , K. Munakata , K. Nagaya , Y. Nakamura , Y. Nakazawa , H. Nanjo , C. C. Ning , M. Nishizawa , R. Noguchi , M. Ohnishi , S. Okukawa , S. Ozawa , X. Qian , X. L. Qian , X. B. Qu , T. Saito , Y. Sakakibara , M. Sakata , T. Sako , T. K. Sako , T. Sasaki , J. Shao , M. Shibata , A. Shiomi , H. Sugimoto , W. Takano , M. Takita , Y. H. Tan , N. Tateyama , S. Torii , H. Tsuchiya , S. Udo , H. Wang , S. F. Wang , Y. P. Wang , Wangdui , H. R. Wu , Q. Wu , J. L. Xu , L. Xue , Z. Yang , Y. Q. Yao , J. Yin , Y. Yokoe , Y. L. Yu , A. F. Yuan , L. M. Zhai , H. M. Zhang , J. L. Zhang , X. Zhang , X. Y. Zhang , Y. Zhang , Yi Zhang , Ying Zhang , S. P. Zhao , Zhaxisangzhu , X. X. Zhou , Y. H. Zou

Studying the nature of the unidentified gamma-ray source HESS J1841-055 with the MAGIC telescopes

We investigate the physical nature and origin of the gamma-ray emission from the extended source HESS J1841-055 observed at TeV and GeV energies. We observed HESS J1841-055 at TeV energies for a total effective time of 43 hours with the…

High Energy Astrophysical Phenomena · Physics 2020-08-26 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , K. Asano , D. Baack , A. Babić , 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 , A. Biland , 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 , D. Dorner , M. Doro , D. Elsaesser , 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 , D. Green , D. Hadasch , A. Hahn , L. Heckmann , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , 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 , K. Mannheim , 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

Diffuse TeV Gamma-Ray Emission in the H.E.S.S. Galactic Plane Survey

Diffuse gamma-ray emission has long been established as the most prominent feature in the GeV sky. Although the imaging atmospheric Cherenkov technique has been successful in revealing a large population of discrete TeV gamma-ray sources, a…

High Energy Astrophysical Phenomena · Physics 2019-08-15 K. Egberts , F. Brun , S. Casanova , W. Hofmann , M. de Naurois , O. Reimer , Q. Weitzel , Y. Fukui

Pulsar TeV Halos Explain the TeV Excess Observed by Milagro

Milagro observations have found bright, diffuse TeV emission concentrated along the galactic plane of the Milky Way. The intensity and spectrum of this emission is difficult to explain with current models where gamma-ray production is…

High Energy Astrophysical Phenomena · Physics 2018-03-28 Tim Linden , Benjamin J. Buckman

Deeper Chandra Follow-up of Cygnus TeV Source Perpetuates Mystery

A 50 ksec Chandra observation of the unidentified TeV source in Cygnus reported by the HEGRA collaboration reveals no obvious diffuse X-ray counterpart. However, 240 Pointlike X-ray sources are detected within or nearby the extended TeV…

Astrophysics · Physics 2008-11-26 Yousaf Butt , Jeremy Drake , Paula Benaglia , Jorge Combi , Thomas Dame , Francesco Miniati , Gustavo Romero

The Contribution From TeV Halos to the Isotropic Gamma-Ray Background

Recent observations have shown that pulsars are surrounded by extended regions which emit TeV-scale gamma rays through the inverse Compton scattering of very high energy electrons and positrons. Such TeV halos are responsible for a large…

High Energy Astrophysical Phenomena · Physics 2022-07-20 Fei Xu , Dan Hooper