Related papers: VERITAS Observations of the gamma-Ray Binary LS I …

Gamma-ray binaries as non-accreting pulsar systems

The gamma-ray binaries LS 5039 and LS I +61 303 have been detected by Cerenkov telescopes at TeV energies, exhibiting periodic behavior correlated with the orbital period. These gamma-ray binary systems have also been recently detected by…

High Energy Astrophysical Phenomena · Physics 2010-08-04 Diego F. Torres

INTEGRAL and XMM-Newton observations of LSI +61 303

LSI +61 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy gamma-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral…

Astrophysics · Physics 2008-11-26 M. Chernyakova , A. Neronov , R. Walter

VERITAS: Status and Highlights

The VERITAS telescope array has been operating smoothly since 2007, and has detected gamma-ray emission above 100 GeV from 40 astrophysical sources. These include blazars, pulsar wind nebulae, supernova remnants, gamma-ray binary systems, a…

High Energy Astrophysical Phenomena · Physics 2017-08-23 J. Holder , E. Aliu , T. Arlen , T. Aune , M. Beilicke , W. Benbow , M. Böttcher , A. Bouvier , J. H. Buckley , V. Bugaev , K. Byrum , A. Cannon , A. Cesarini , J. L. Christiansen , L. Ciupik , E. Collins-Hughes , M. P. Connolly , W. Cui , R. Dickherber , C. Duke , V. V. Dwarkadas , M. Errando , A. Falcone , J. P. Finley , G. Finnegan , L. Fortson , A. Furniss , N. Galante , D. Gall , K. Gibbs , G. H. Gillanders , S. Godambe , S. Griffin , J. Grube , R. Guenette , G. Gyuk , D. Hanna , H. Huan , G. Hughes , C. M. Hui , T. B. Humensky , A. Imran , P. Kaaret , N. Karlsson , M. Kertzman , Y. Khassen , D. Kieda , H. Krawczynski , F. Krennrich , M. J. Lang , M. Lyutikov , A. S Madhavan , G. Maier , P. Majumdar , S. McArthur , A. McCann , M. McCutcheon , P. Moriarty , R. Mukherjee , P. D Nunez , R. A. Ong , M. Orr , A. N. Otte , N. Park , J. S. Perkins , A. Pichel , F. Pizlo , M. Pohl , H. Prokoph , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , A. C. Rovero , J. Ruppel , A. C. Sadun , D. B. Saxon , M. Schroedter , G. H. Sembroski , G. D. Şentürk , A. W. Smith , D. Staszak , G. Tešić , M. Theiling , S. Thibadeau , K. Tsurusaki , J. Tyler , A. Varlotta , V. V. Vassiliev , S. Vincent , M. Vivier , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , D. A. Williams , B. Zitzer

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

Fermi LAT Observations of LS 5039

The first results from observations of the high mass X-ray binary LS 5039 using the Fermi Gamma-ray Space Telescope data between 2008 August and 2009 June are presented. Our results indicate variability that is consistent with the binary…

High Energy Astrophysical Phenomena · Physics 2012-08-27 The Fermi LAT collaboration

What can Simbol-X do for gamma-ray binaries?

Gamma-ray binaries have been uncovered as a new class of Galactic objects in the very high energy sky (> 100 GeV). The three systems known today have hard X-ray spectra (photon index ~ 1.5), extended radio emission and a high luminosity in…

High Energy Astrophysical Phenomena · Physics 2009-06-25 Benoit Cerutti , Guillaume Dubus , Gilles Henri , Adam B. Hill , Anna Szostek

High zenith angle observations of PKS 2155-304 with the MAGIC telescope

The high frequency peaked BL Lac PKS 2155-304 with a redshift z=0.116 was discovered 1997 in the VHE range by the University of Durham Mark 6 gamma-ray telescope in Australia with a flux corresponding to approx. 0.2 times the Crab Nebula…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 D. Hadasch , T. Bretz , D. Mazin

Detection of Extended VHE Gamma Ray Emission from G106.3+2.7 with VERITAS

We report the detection of very-high-energy (VHE) gamma-ray emission from supernova remnant (SNR) G106.3+2.7. Observations performed in 2008 with the VERITAS atmospheric Cherenkov gamma-ray telescope resolve extended emission overlapping…

High Energy Astrophysical Phenomena · Physics 2014-11-20 VERITAS Collaboration , V. A. Acciari , E. Aliu , T. Arlen , T. Aune , M. Bautista , M. Beilicke , W. Benbow , D. Boltuch , S. M. Bradbury , J. H. Buckley , V. Bugaev , Y. Butt , K. Byrum , A. Cannon , A. Cesarini , Y. C. Chow , L. Ciupik , P. Cogan , W. Cui , R. Dickherber , T. Ergin , S. J. Fegan , J. P. Finley , P. Fortin , L. Fortson , A. Furniss , D. Gall , G. H. Gillanders , E. V. Gotthelf , J. Grube , R. Guenette , G. Gyuk , D. Hanna , J. Holder , D. Horan , C. M. Hui , T. B. Humensky , P. Kaaret , N. Karlsson , M. Kertzman , D. Kieda , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , S. LeBohec , G. Maier , A. McCann , M. McCutcheon , J. Millis , P. Moriarty , R. Mukherjee , R. A. Ong , A. N. Otte , D. Pandel , J. S. Perkins , M. Pohl , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , E. Roache , H. J. Rose , M. Schroedter , G. H. Sembroski , A. W. Smith , D. Steele , S. P. Swordy , M. Theiling , J. A. Toner , V. V. Vassiliev , S. Vincent , R. G. Wagner , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , D. A. Williams , S. Wissel , M. Wood , B. Zitzer

VHE Gamma Rays from PKS 2155-304

The close X-ray selected BL Lac PKS 2155-304 has been observed using the University of Durham Mark 6 very high energy (VHE) gamma ray telescope during 1996 September/October/November and 1997 October/November. VHE gamma rays with energy >…

Astrophysics · Physics 2016-11-23 P. M. Chadwick , K. Lyons , T. J. L. McComb , K. J. Orford , J. L. Osborne , S. M. Rayner , S. E. Shaw , K. E. Turver , G. J. Wieczorek

AstroSat Observation of Recent Outburst in the Be/X-ray Binary LS V +4417/RX J0440.9+4431

A Be/X-ray binary system known as RX J0440.9+4431 (or LS V +44 17) is a potential member of the uncommon gamma-ray binary class. With an orbital period of 150 days, this system consists of a neutron star and a Be star companion. The MAXI…

High Energy Astrophysical Phenomena · Physics 2024-02-09 Arshad Hussain , Umananda Dev Goswami

Evidence of coupling between the thermal and nonthermal emission in the gamma-ray binary LS I +61 303

The gamma-ray binary LS I +61 303 is composed of a Be star and a compact companion orbiting in an eccentric orbit. Variable flux modulated with the orbital period of ~26.5 d has been detected from radio to very high-energy gamma rays. In…

High Energy Astrophysical Phenomena · Physics 2015-02-25 X. Paredes-Fortuny , M. Ribó , V. Bosch-Ramon , J. Casares , O. Fors , J. Núñez

VERITAS Observations of the BL Lac Object PG 1553+113 Between May 2010 and May 2011

VERITAS, an array of imaging atmospheric-Cherenkov telescopes, studies blazars in the energy range between ~100 GeV and ~30 TeV. With its excellent sensitivity at these energies, and ever-deepening source exposures, VERITAS is in a position…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 Matthew Orr

Multi-wavelength Observations of H 2356-309

AIMS: The properties of the broad-band emission from the high-frequency peaked BL Lac H 2356-309 (z=0.165) are investigated. METHODS: Very High Energy (VHE; E > 100 GeV) observations of H 2356-309 were performed with the High Energy…

High Energy Astrophysical Phenomena · Physics 2015-05-18 HESS Collaboration , A. Abramowski , F. Acero , F. Aharonian , A. G. Akhperjanian , G. Anton , U. Barres de Almeida , A. R. Bazer-Bachi , Y. Becherini , B. Behera , W. Benbow , K. Bernloehr , A. Bochow , C. Boisson , J. Bolmont , V. Borrel , J. Brucker , F. Brun , P. Brun , R. Buehler , T. Bulik , I. Buesching , T. Boutelier , P. M. Chadwick , A. Charbonnier , R. C. G. Chaves , A. Cheesebrough , J. Conrad , L. -M. Chounet , A. C. Clapson , G. Coignet , L. Costamante , M. Dalton , M. K. Daniel , I. D. Davids , B. Degrange , C. Deil , H. J. Dickinson , A. Djannati-Atai , W. Domainko , L. O'C. Drury , F. Dubois , G. Dubus , J. Dyks , M. Dyrda , K. Egberts , P. Eger , P. Espigat , L. Fallon , C. Farnier , S. Fegan , F. Feinstein , M. V. Fernandes , A. Fiasson , A. Foerster , G. Fontaine , M. Fuessling , S. Gabici , Y. A. Gallant , L. Gerard , D. Gerbig , B. Giebels , J. F. Glicenstein , B. Glueck , P. Goret , D. Goering , D. Hampf , M. Hauser , S. Heinz , G. Heinzelmann , G. Henri , G. Hermann , J. A. Hinton , A. Hoffmann , W. Hofmann , P. Hofverberg , M. Holleran , S. Hoppe , D. Horns , A. Jacholkowska , O. C. de Jager , C. Jahn , I. Jung , K. Katarzynski , U. Katz , S. Kaufmann , M. Kerschhaggl , D. Khangulyan , B. Khelifi , D. Keogh , D. Klochkov , W. Kluzniak , T. Kneiske , Nu. Komin , K. Kosack , R. Kossakowski , G. Lamanna , J. -P. Lenain , T. Lohse , C. -C. Lu , V. Marandon , A. Marcowith , J. Masbou , D. Maurin , T. J. L. McComb , M. C. Medina , J. Mehault , R. Moderski , E. Moulin , M. Naumann-Godo , M. de Naurois , D. Nedbal , D. Nekrassov , N. Nguyen , B. Nicholas , J. Niemiec , S. J. Nolan , S. Ohm , J-F. Olive , E. de Ona Wilhelmi , B. Opitz , K. J. Orford , M. Ostrowski , M. Panter , M. Paz Arribas , G. Pedaletti , G. Pelletier , P. -O. Petrucci , S. Pita , G. Puehlhofer , M. Punch , A. Quirrenbach , B. C. Raubenheimer , M. Raue , S. M. Rayner , O. Reimer , M. Renaud , R. de los Reyes , F. Rieger , J. Ripken , L. Rob , S. Rosier-Lees , G. Rowell , B. Rudak , C. B. Rulten , J. Ruppel , F. Ryde , V. Sahakian , A. Santangelo , R. Schlickeiser , F. M. Schoeck , A. Schoenwald , U. Schwanke , S. Schwarzburg , S. Schwemmer , A. Shalchi , I. Sushch , M. Sikora , J. L. Skilton , H. Sol , L. Stawarz , R. Steenkamp , C. Stegmann , F. Stinzing , A. Szostek , P. H. Tam , J. -P. Tavernet , R. Terrier , O. Tibolla , M. Tluczykont , K. Valerius , C. van Eldik , G. Vasileiadis , C. Venter , L. Venter , J. P. Vialle , A. Viana , P. Vincent , M. Vivier , H. J. Voelk , F. Volpe , S. Vorobiov , S. J. Wagner , M. Ward , A. A. Zdziarski , A. Zech , H. -S. Zechlin

CANGAROO-III Observations of the 2006 Outburst of PKS2155-304

We have used the CANGAROO-III imaging atmospheric Cherenkov telescopes to observe the high-frequency-peaked BL Lacertae (HBL) object PKS 2155-304 between 2006 July 28 (MJD 53944) and August 2, triggered by the H.E.S.S. report that the…

Astrophysics · Physics 2012-08-27 III collaboration , Y. Sakamoto , K. Nishijima , T. Mizukami , E. Yamazaki , J. Kushida

HESS Observations and VLT Spectroscopy of PG 1553+113

AIMS: The properties of the very high energy (VHE; E>100 GeV) gamma-ray emission from the high-frequency peaked BL Lac PG 1553+113 are investigated. An attempt is made to measure the currently unknown redshift of this object. METHODS: VHE…

Astrophysics · Physics 2011-02-11 HESS Collaboration , F. Aharonian

Detection of the Crab Pulsar with VERITAS above 100 GeV

We discuss the recent 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…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Andrew McCann

Discovery of Very High Energy Gamma-Ray Emission from the BL Lac Object H2356-309 with the H.E.S.S. Cherenkov Telescopes

The extreme synchrotron BL Lac object H2356-309, located at a redshift of z = 0.165, was observed from June to December 2004 with a total exposure of approx. 40 h live-time with the H.E.S.S. (High Energy Stereoscopic System) array of…

Astrophysics · Physics 2009-11-11 Aharonian et al.

The VERITAS Survey of the Cygnus Region of the Galactic Plane

The VERITAS IACT observatory has carried out an extensive survey of the Cygnus region between 67 and 82 degrees in galactic longitude and between -1 and 4 degrees in galactic latitude. This region is a natural choice for a Very High Energy…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Amanda Weinstein

VERITAS follow-up observation of the BL Lac blazar B2 1811+31 2020 Flare

VERITAS is an imaging atmospheric Cherenkov telescope (IACT) array most sensitive to gamma rays in the very-high-energy (VHE) energy band (85 GeV - 30 TeV). As a part of its active galactic nuclei (AGN) program, VERITAS focuses on the…

High Energy Astrophysical Phenomena · Physics 2023-09-25 Pablo Drake , Colin Adams

Deep Broadband Observations of the Distant Gamma-ray Blazar PKS 1424+240

We present deep VERITAS observations of the blazar PKS 1424+240, along with contemporaneous Fermi Large Area Telescope, Swift X-ray Telescope and Swift UV Optical Telescope data between 2009 February 19 and 2013 June 8. This blazar resides…

High Energy Astrophysical Phenomena · Physics 2015-06-19 S. Archambault , T. Aune , B. Behera , M. Beilicke , W. Benbow , K. Berger , R. Bird , J. Biteau , V. Bugaev , K. Byrum , J. V Cardenzana , M. Cerruti , X. Chen , L. Ciupik , M. P. Connolly , W. Cui , J. Dumm , M. Errando , A. Falcone , S. Federici , Q. Feng , J. P. Finley , H. Fleischhack , L. Fortson , A. Furniss , N. Galante , G. H. Gillanders , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , D. Hanna , J. Holder , G. Hughes , T. B. Humensky , C. A. Johnson , P. Kaaret , M. Kertzman , Y. Khassen , D. Kieda , H. Krawczynski , F. Krennrich , S. Kumar , M. J. Lang , A. S Madhavan , G. Maier , A. McCann , K. Meagher , P. Moriarty , R. Mukherjee , D. Nieto , A. O'Faolain de Bhroithe , R. A. Ong , A. N. Otte , N. Park , M. Pohl , A. Popkow , H. Prokoph , J. Quinn , K. Ragan , J. Rajotte , L. C. Reyes , P. T. Reynolds , G. T. Richards , E. Roache , G. H. Sembroski , K. Shahinyan , D. Staszak , I. Telezhinsky , J. V. Tucci , J. Tyler , A. Varlotta , V. V. Vassiliev , S. Vincent , S. P. Wakely , A. Weinstein , R. Welsing , A. Wilhelm , D. A. Williams , M. Ackermann , M. Ajello , A. Albert , L. Baldini , D. Bastieri , R. Bellazzini , E. Bissaldi , J. Bregeon , R. Buehler , S. Buson , G. A. Caliandro , R. A. Cameron , P. A. Caraveo , E. Cavazzuti , E. Charles , J. Chiang , S. Ciprini , R. Claus , S. Cutini , F. D'Ammando , A. de Angelis , F. de Palma , C. D. Dermer , S. W. Digel , L. Di Venere , P. S. Drell , C. Favuzzi , A. Franckowiak , P. Fusco , F. Gargano , D. Gasparrini , N. Giglietto , F. Giordano , M. Giroletti , I. A. Grenier , S. Guiriec , T. Jogler , M. Kuss , S. Larsson , L. Latronico , F. Longo , F. Loparco , P. Lubrano , G. M. Madejski , M. Mayer , M. N. Mazziotta , P. F. Michelson , T. Mizuno , M. E. Monzani , A. Morselli , S. Murgia , E. Nuss , T. Ohsugi , J. F. Ormes , J. S. Perkins , F. Piron , G. Pivato , S. Raino , M. Razzano , A. Reimer , O. Reimer , S. Ritz , M. Schaal , C. Sgro , E. J. Siskind , P. Spinelli , H. Takahashi , L. Tibaldo , M. Tinivella , E. Troja , G. Vianello , M. Werner , M. Wood