Related papers: VERITAS observations of M87 from 2007 to present

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

The relentless variability of Mrk 421 from the TeV to the radio

The origin of the gamma-ray emission of the blazar Mrk 421 is still a matter of debate. We used 5.5 years of unbiased observing campaign data, obtained using the FACT telescope and the Fermi LAT detector at TeV and GeV energies, the longest…

High Energy Astrophysical Phenomena · Physics 2021-03-17 Axel Arbet-Engels , Dominik Baack , Matteo Balbo , Adrian Biland , Michael Blank , Thomas 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 , Vitalii Sliusar , Roland Walter , Elan von Willert

Multiwavelength observations of a TeV-Flare from W Comae

We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy gamma-ray emission in June 2008. The very high energy…

High Energy Astrophysical Phenomena · Physics 2016-03-23 VERITAS collaboration , V. A. Acciari , E. Aliu , T. Aune , M. Beilicke , W. Benbow , M. Bottcher , D. Boltuch , J. H. Buckley , S. M. Bradbury , V. Bugaev , K. Byrum , A. Cannon , A. Cesarini , L. Ciupik , P. Cogan , W. Cui , R. Dickherber , C. Duke , A. Falcone , J. P. Finley , P. Fortin , L. Fortson , A. Furniss , N. Galante , D. Gall , K. Gibbs , G. H. Gillanders , J. Grube , R. Guenette , G. Gyuk , D. Hanna , J. Holder , 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 , S. McArthur , A. McCann , M. McCutcheon , J. Millis , P. Moriarty , R. A. Ong , A. N. Otte , D. Pandel , J. S. Perkins , A. Pichel , M. Pohl , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , E. Roache , H. J. Rose , G. H. Sembroski , A. W. Smith , D. Steele , M. Theiling , S. Thibadeau , A. Varlotta , V. V. Vassiliev , S. Vincent , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , D. A. Williams , S. Wissel , M. Wood , The AGILE Team , : , E. Pian , S. Vercellone , I. Donnarumma , F. D'Ammando , A. Bulgarelli , A. W. Chen , A. Giuliani , F. Longo , L. Pacciani , G. Pucella , V. Vittorini , M. Tavani , A. Argan , G. Barbiellini , P. Caraveo , P. W. Cattaneo , V. Cocco , E. Costa , E. Del Monte , G. De Paris , G. Di Cocco , Y. Evangelista , M. Feroci , M. Fiorini , T. Froysland , M. Frutti , F. Fuschino , M. Galli , F. Gianotti , C. Labanti , I. Lapshov , F. Lazzarotto , P. Lipari , M. Marisaldi , M. Mastropietro , S. Mereghetti , E. Morelli , A. Morselli , A. Pellizzoni , F. Perotti , G. Piano , P. Picozza , M. Pilia , G. Porrovecchio , M. Prest , M. Rapisarda , A. Rappoldi , A. Rubini , S. Sabatini P. Soffitta , M. Trifoglio , A. Trois , E. Vallazza , A. Zambra , D. Zanello , C. Pittori , P. Santolamazza , F. Verrecchia , P. Giommi , S. Colafrancesco , L. Salotti , M. Villata , C. M. Raiteri , H. D. Aller , M. F. Aller , A. A. Arkharov , N. V. Efimova , V. M. Larionov , P. Leto , R. Ligustri , E. Lindfors , M. Pasanen , O. M. Kurtanidze , S. D. Tetradze , A. Lahteenmaki , M. Kotiranta , A. Cucchiara , P. Romano , R. Nesci , T. Pursimo , J. Heidt , E. Benitez , D. Hiriart , K. Nilsson , A. Berdyugin , R. Mujica , D. Dultzin , J. M. Lopez , M. Mommert , M. Sorcia , I. de la Calle Perez

Probing the origin of VHE emission from M 87 with MWL observations in 2010

The large majority of extragalactic very high energy (VHE; E>100 GeV) sources belongs to the class of active galactic nuclei (AGN), in particular the BL Lac sub-class. AGNs are characterized by an extremely bright and compact emission…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-15 Martin Raue , Lukasz Stawarz , Daniel Mazin , Pierre Colin , Michelle Hui , Matthias Beilicke , Craig Walker

VERITAS observations of the BL Lac object TXS 0506+056

On 2017 September 22, the IceCube Neutrino Observatory reported the detection of the high-energy neutrino event \icnu, of potential astrophysical origin. It was soon determined that the neutrino direction was consistent with the location of…

High Energy Astrophysical Phenomena · Physics 2018-07-13 A. U. Abeysekara , A. Archer , W. Benbow , R. Bird , A. Brill , R. Brose , J. H. Buckley , J. L. Christiansen , A. J. Chromey , M. K. Daniel , A. Falcone , Q. Feng , J. P. Finley , L. Fortson , A. Furniss , G. H. Gillanders , O. Gueta , D. Hanna , O. Hervet , J. Holder , G. Hughes , T. B. Humensky , C. A. Johnson , P. Kaaret , P. Kar , N. Kelley-Hoskins , M. Kertzman , D. Kieda , M. Krause , F. Krennrich , M. J. Lang , P. Moriarty , R. Mukherjee , S. O'Brien , R. A. Ong , A. N. Otte , N. Park , A. Petrashyk , M. Pohl , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , G. T. Richards , E. Roache , C. Rulten , I. Sadeh , M. Santander , S. S. Scott , G. H. Sembroski , K. Shahinyan , J. Tyler , S. P. Wakely , A. Weinstein , R. M. Wells , P. Wilcox , A. Wilhelm , D. A. Williams , T. J Williamson , B. Zitzer

VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study

The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with VERITAS between February 2017 and May 2019. These deep observations resulted in the discovery of very-high-energy (VHE; E $>100$ GeV) $\gamma$-ray…

High Energy Astrophysical Phenomena · Physics 2020-06-17 A. Archer , W. Benbow , R. Bird , A. Brill , M. Buchovecky , J. H. Buckley , M. T. Carini , J. L. Christiansen , A. J. Chromey , M. K. Daniel , M. Errando , A. Falcone , Q. Feng , P. Fortin , L. Fortson , A. Furniss , A. Gent , M. Georganopoulos , G. H. Gillanders , C. Giuri , O. Gueta , D. Hanna , T. Hassan , O. Hervet , J. Holder , G. Hughes , T. B. Humensky , P. Kaaret , M. Kertzman , D. Kieda , F. Krennrich , M. J. Lang , T. T. Y. Lin , M. L. Lister , M. Lundy , G. Maier , E. T. Meyer , P. Moriarty , R. Mukherjee , D. Nieto , M. Nievas-Rosillo , S. O'Brien , R. A. Ong , K. Pfrang , M. Pohl , R. R. Prado , E. Pueschel , J. Quinn , K. Ragan , K. Ramirez , P. T. Reynolds , D. Ribeiro , G. T. Richards , E. Roache , C. Rulten , J. L. Ryan , A. Sadun , M. Santander , S. S. Scott , G. H. Sembroski , K. Shahinyan , R. Shang , B. Stevenson , V. V. Vassiliev , S. P. Wakely , A. Weinstein , P. Wilcox , A. Wilhelm , D. A. Williams , T. J Williamson

Multiwavelength Observations of The TeV Binary LS I +61 303 with VERITAS, Fermi-LAT and Swift-XRT During a TeV Outburst

We present the results of a multiwavelength observational campaign on the TeV binary system LS I +61 303 with the VERITAS telescope array (>200 GeV), Fermi-LAT (0.3-300 GeV), and Swift-XRT (2-10 keV). The data were taken from December 2011…

High Energy Astrophysical Phenomena · Physics 2015-06-17 E. Aliu , S. Archambault , B. Behera , K. Berger , M. Beilicke , W. Benbow , R. Bird , A. Bouvier , V. Bugaev , M. Cerruti , X. Chen , L. Ciupik , M. P. Connolly , W. Cui , J. Dumm , A. Falcone , S. Federici , Q. Feng , J. P. Finley , P. Fortin , 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 , P. Kaaret , M. Kertzman , Y. Khassen , D. Kieda , F. Krennrich , M. J. Lang , G. Maier , P. Majumdar , S. McArthur , A. McCann , P. Moriarty , R. Mukherjee , A. O'Faolain de Bhroithe , R. A. Ong , A. N. Otte , N. Park , J. S. Perkins , M. Pohl , A. Popkow , H. Prokoph , J. Quinn , K. Ragan , J. Rajotte , G. Ratliff , P. T. Reynolds , G. T. Richards , E. Roache , G. H. Sembroski , F. Sheidaei , C. Skole , A. W. Smith , D. Staszak , I. Telezhinsky , J. Tyler , A. Varlotta , S. Vincent , S. P. Wakely , T. C. Weekes , A. Weinstein , R. Welsing , A. Zajczyk , B. Zitzer

Multi-Wavelength Observation Campaign of the TeV Gamma-Ray Binary HESS J0632+057 with NuSTAR, VERITAS, MDM, and Swift

HESS J0632+057 belongs to a rare subclass of binary systems which emits gamma-rays above 100 GeV. It stands out for its distinctive high-energy light curve, which features a sharp ``primary'' peak and broader ``secondary'' peak. We present…

High Energy Astrophysical Phenomena · Physics 2021-12-15 Y. M. Tokayer , H. An , J. P. Halpern , J. Kim , K. Mori , C. J. Hailey , C. B. Adams , W. Benbow , A. Brill , J. H. Buckley , M. Capasso , M. Errando , A. Falcone , K. A Farrell , G. M Foote , L. Fortson , A. Furniss , A. Gent , C. Giuri , D. Hanna , T. Hassan , O. Hervet , J. Holder , B. Hona , T. B. Humensky , W. Jin , P. Kaaret , M. Kertzman , D. Kieda , M. J. Lang , G. Maier , C. E McGrath , P. Moriarty , R. Mukherjee , M. Nievas-Rosillo , S. O'Brien , R. A. Ong , A. N. Otte , N. Park , S. Patel , K. Pfrang , M. Pohl , R. R. Prado , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , D. Ribeiro , E. Roache , J. L. Ryan , M. Santander , S. Schlenstedt , G. H. Sembroski , A. Weinstein , D. A. Williams , T. J Williamson

The Veritas Project

VERITAS is a new, major ground-based gamma-ray observatory designed to significantly advance our understanding of extreme astrophysical processes in the universe. The observatory comprises seven large-aperture (12m diameter) Cherenkov…

Astrophysics · Physics 2019-08-14 Rene A. Ong

VERITAS Observations of the Galactic Center Region at Multi-TeV Gamma-Ray Energies

The Galactic Center (GC) region hosts a variety of powerful astronomical sources and rare astrophysical processes that emit a large flux of non-thermal radiation. The inner 375 pc x 600 pc region, called the Central Molecular Zone, is home…

High Energy Astrophysical Phenomena · Physics 2021-06-09 C. B. Adams , W. Benbow , A. Brill , R. Brose , M. Buchovecky , M. Capasso , J. L. Christiansen , A. J. Chromey , M. K. Daniel , M. Errando , A. Falcone , Q. Feng , J. P. Finley , L. Fortson , A. Furniss , A. Gent , G. H. Gillanders , C. Giuri , D. Hanna , O. Hervet , J. Holder , G. Hughes , T. B. Humensky , W. Jin , P. Kaaret , N. Kelley-Hoskins , M. Kertzman , D. Kieda , F. Krennrich , S. Kumar , M. J. Lang , M. Lundy , G. Maier , P. Moriarty , R. Mukherjee , D. Nieto , M. Nievas-Rosillo , S. O'Brien , R. A. Ong , A. N. Otte , K. Pfrang , M. Pohl , R. R. Prado , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , D. Ribeiro , G. T. Richards , E. Roache , J. L. Ryan , M. Santander , S. Schlenstedt , G. H. Sembroski , R. Shang , B. Stevenson , S. P. Wakely , A. Weinstein , D. A. Williams

Observing FRB 121102 with VERITAS; Searching for Associated TeV Emission

Fast radio bursts are bright, unresolved and short flashes of radio emission originating from outside the Milky Way. The origin of these mysterious outbursts is unknown, but their high luminosity and short duration has prompted much…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Ralph Bird

VERITAS observations of the Be/X-ray binary system LS V +44 17 during a major outburst

The Be/X-ray binary system LS V +44 17 (RX J0440.9+4431) is a potential member of the rare class of gamma-ray binaries. The system is comprised of a Be star and a neutron star companion with an orbital period of 150 days. In December of…

High Energy Astrophysical Phenomena · Physics 2023-08-24 Jamie Holder

The energy distribution of relativistic electrons in the kilo-parsec scale jet of M87 with Chandra

The X-ray emission from the jets in Active Galactic Nuclei (AGN) carries important information on the distributions of relativistic electrons and magnetic fields on large scales. We reanalyze archival Chandra observations on the jet of M87…

High Energy Astrophysical Phenomena · Physics 2018-05-09 Xiao-Na Sun , Rui-Zhi Yang , Frank M. Rieger , Ruo-yu Liu , Felix Aharonian

Characterizing the VHE emission of LS I +61 303 using VERITAS observations

The TeV gamma-ray binary LS I +61 303, approximately 2 kpc from Earth, consists of a low mass compact object in an eccentric orbit around a massive Be star. LS I +61 303 exhibits modulated VHE gamma-ray emission around its 26.5 days orbit,…

High Energy Astrophysical Phenomena · Physics 2019-08-09 D. B. Kieda , the VERITAS Collaboration

VERITAS Observations of the gamma-Ray Binary LS I +61 303

LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycles (between September 2006 and February 2007) with the…

Astrophysics · Physics 2009-11-13 V. A. Acciari , M. Beilicke , G. Blaylock , S. M. Bradbury , J. H. Buckley , V. Bugaev , Y. Butt , K. L. Byrum , O. Celik , A. Cesarini , L. Ciupik , Y. C. K. Chow , P. Cogan , P. Colin , W. Cui , M. K. Daniel , C. Duke , T. Ergin , A. D. Falcone , S. J. Fegan , J. P. Finley , P. Fortin , L. F. Fortson , D. Gall , K. Gibbs , G. H. Gillanders , J. Grube R. Guenette , D. Hanna , E. Hays , J. Holder , D. Horan , S. B. Hughes , C. M. Hui , T. B. Humensky , P. Kaaret , D. B. Kieda , J. Kildea , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , S. LeBohec , K. Lee , G. Maier , A. McCann , M. McCutcheon , J. Millis , P. Moriarty , R. Mukherjee , T. Nagai , R. A. Ong , D. Pandel , J. S. Perkins , F. Pizlo , M. Pohl , J. Quinn , K. Ragan , P. T. Reynolds , H. J. Rose , M. Schroedter , G. H. Sembroski , A. W. Smith , D. Steele , S. P. Swordy , J. A. Toner , L. Valcarcel , V. V. Vassiliev , R. Wagner , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , R. J. White , D. A. Williams , S. A. Wissel , M. Wood , B. Zitzer

Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and RXTE

We present results from a long-term monitoring campaign on the TeV binary LSI +61 303 with VERITAS at energies above 500 GeV, and in the 2-10 keV hard X-ray bands with RXTE and Swift, sampling nine 26.5 day orbital cycles between September…

High Energy Astrophysical Phenomena · Physics 2015-05-13 VERITAS Collaboration , V. A. Acciari , E. Aliu , T. Arlen , M. Bautista , M. Beilicke , W. Benbow , M. Bottcher , S. M. Bradbury , V. Bugaev , Y. Butt , Y. Butt , K. Byrum0 , A. Cannon , A. Cesarini , Y. C. Chow , L. Ciupik , P. Cogan , P. Colin , W. Cui , M. Daniel , R. Dickherber , T. Ergin , A. Falcone , S. J. Fegan , J. P. Finley , P. Fortin , L. Fortson , A. Furniss , D. Gall , G. H. Gillanders , J. Grube , R. Guenette , G. Gyuk , D. Hanna , E. Hays , J. Holder , D. Horan , C. M. Hui , T. B. Humensky , P. Kaaret , N. Karlsson , D. Kieda , J. Kildea , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , S. LeBohec , G. Maier , A. McCann , M. McCutcheon , J. Millis , P. Moriarty , R. Mukherjee , T. Nagai , R. A. Ong , A. N. Otte , D. Pandel , J. S. Perkins , 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 , M. Stroh , S. Swordy , M. Theiling , J. A. Toner , A. Varlotta , V. V. Vassiliev , R. G. Wagner , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinsteiny , R. J. White , D. A. Williams , S. Wissely , M. Woody , B. Zitzer

Study of high-energy particle acceleration in Tycho with gamma-ray observations

Gamma-ray emission from supernova remnants (SNRs) can provide a unique window to observe the cosmic-ray acceleration believed to take place in these objects. Tycho is an especially good target for investigating hadronic cosmic-ray…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Nahee Park

Blazar observations above 100 GeV with VERITAS

The VERITAS array of 12-m atmospheric-Cherenkov telescopes in southern Arizona is one of the world's most-sensitive detectors of very-high-energy (VHE, E>100 GeV) gamma rays. More than 50 extragalactic sources are known to emit VHE photons;…

High Energy Astrophysical Phenomena · Physics 2019-08-13 M. Errando

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

Investigations that were carried out over the last two decades with novel and more sensitive instrumentation have dramatically improved our knowledge of the more violent physical processes taking place in galactic and extra-galactic…

High Energy Astrophysical Phenomena · Physics 2021-05-04 Angela Malizia , Mariateresa Fiocchi , Lorenzo Natalucci , Vito Sguera , John B. Stephen , Loredana Bassani , Angela Bazzano , Pietro Ubertini , Elena Pian , Antony J. Bird

A survey of active galaxies at TeV photon energies with the HAWC gamma-ray observatory

The High Altitude Water Cherenkov Gamma-Ray Observatory (HAWC) continuously detects TeV photons and particles within its large field-of-view, accumulating every day a deeper exposure of two thirds of the sky. We analyzed 1523~days of HAWC…

High Energy Astrophysical Phenomena · Physics 2021-02-10 A. Albert , C. Alvarez , J. R. Angeles Camacho , J. C. Arteaga-Velázquez , K. P. Arunbabu , D. Avila Rojas , H. A. Ayala Solares , V. Baghmanyan , E. Belmont-Moreno , S. Y. BenZvi , C. Brisbois , K. S. Caballero-Mora , T. Capistrán , A. Carramiñana , S. Casanova , U. Cotti , J. Cotzomi , S. Coutiño de León , E. De la Fuente , B. L. Dingus , M. A. DuVernois , M. Durocher , J. C. Díaz-Vélez , K. Engel , C. Espinoza , K. L. Fan , M. Fernández Alonso , H. Fleischhack , N. Fraija , A. Galván-Gámez , D. García , J. A. García-González , F. Garfias , M. M. González , J. A. Goodman , J. P. Harding , S. Hernández , B. Hona , D. Huang , F. Hueyotl-Zahuantitla , P. Hüntemeyer , A. Iriarte , A. Jardin-Blicq , V. Joshi , D. Kieda , A. Lara , W. H. Lee , H. León Vargas , J. T. Linnemann , A. L. Longinotti , G. Luis-Raya , J. Lundeen , K. Malone , O. Martínez , I. Martinez-Castellanos , J. Martínez-Castro , J. A. Matthews , P. Miranda-Romagnoli , J. A. Morales-Soto , E. Moreno , M. Mostafá , A. Nayerhoda , L. Nellen , M. Newbold , M. U. Nisa , R. Noriega-Papaqui , L. Olivera-Nieto , A. Peisker , E. G. Pérez-Pérez , C. D. Rho , D. Rosa-González , E. Ruiz-Velasco , H. Salazar , F. Salesa Greus , A. Sandoval , M. Schneider , H. Schoorlemmer , A. J. Smith , R. W. Springer , K. Tollefson , I. Torres , R. Torres-Escobedo , F. Ureña-Mena , L. Villaseñor , T. Weisgarber , E. Willox , A. Zepeda , H. Zhou , C. de León