Related papers: The VERITAS-Stellar Intensity Interferometry (VSII…

Performance of the upgraded VERITAS Stellar Intensity Interferometer (VSII)

The VERITAS Imaging Atmospheric Cherenkov Telescope array (IACT) was augmented in 2019 with high-speed focal plane electronics to create a new Stellar Intensity Interferometry (SII) observational capability (VERITAS-SII, or VSII). VSII…

Instrumentation and Methods for Astrophysics · Physics 2022-09-09 David B. Kieda , VERITAS Collaboration

Status of the VERITAS Stellar Intensity Interferometry (VSII) System

The VERITAS Imaging Air Cherenkov Telescope array (IACT) was augmented in 2019 with high-speed focal plane electronics to allow the use of VERITAS for Stellar Intensity Interferometry (SII) observations. Since that time, several…

Instrumentation and Methods for Astrophysics · Physics 2021-08-23 D. B Kieda , Jonathan Davis , Tugdual LeBohec , Mike Lisa , Nolan K. Matthews

Astrophysical measurements with the VERITAS Stellar Intensity Interferometer

Imaging Atmospheric Cherenkov Telescopes have long been viewed as potential light collectors to be used for long baseline optical intensity interferometry observations. Intensity interferometry, as implemented with Cherenkov telescopes, is…

Instrumentation and Methods for Astrophysics · Physics 2019-08-13 N. Matthews , S. LeBohec

Performance and first measurements of the MAGIC Stellar Intensity Interferometer

In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC telescopes host the MAGIC-SII system (Stellar…

Instrumentation and Methods for Astrophysics · Physics 2024-04-15 MAGIC Collaboration , S. Abe , J. Abhir , V. A. Acciari , A. Aguasca-Cabot , I. Agudo , T. Aniello , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , C. Arcaro , M. Artero , K. Asano , A. Babić , A. Baquero , U. Barres de Almeida , J. A. Barrio , I. Batković , A. Bautista , J. Baxter , J. Becerra González , E. Bernardini , M. Bernardos , J. Bernete , A. Berti , J. Besenrieder , C. Bigongiari , A. Biland , O. Blanch , Ž. Bošnjak , I. Burelli , G. Busetto , A. Campoy-Ordaz , A. Carosi , R. Carosi , M. Carretero-Castrillo , G. Ceribella , Y. Chai , A. Cifuentes , 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 , R. de Menezes , A. Del Popolo , M. Delfino , J. Delgado , C. Delgado Mendez , F. Di Pierro , L. Di Venere , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , G. Emery , J. Escudero , L. Fari na , A. Fattorini , L. Foffano , L. Font , S. Fröse , S. Fukami , Y. Fukazawa , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , J. G. Giesbrecht Paiva , N. Giglietto , F. Giordano , P. Gliwny , T. Gradetzke , R. Grau , D. Green , J. G. Green , P. Günther , D. Hadasch , A. Hahn , T. Hassan , L. Heckmann , J. Herrera , D. Hrupec , M. Hütten , R. Imazawa , K. Ishio , I. Jiménez Martínez , J. Jormanainen , T. Kayanoki , D. Kerszberg , G. W. Kluge , Y. Kobayashi , P. M. Kouch , H. Kubo , J. Kushida , M. Láinez , A. Lamastra , F. Leone , E. Lindfors , L. Linhoff , S. Lombardi , F. Longo , R. López-Coto , M. López-Moya , A. López-Oramas , S. Loporchio , A. Lorini , E. Lyard , B. Machado de Oliveira Fraga , P. Majumdar , M. Makariev , G. Maneva , N. Mang , M. Manganaro , S. Mangano , K. Mannheim , M. Mariotti , M. Martínez , M. Martínez-Chicharro , A. Mas-Aguilar , D. Mazin , S. Menchiari , S. Mender , D. Miceli , T. Miener , J. M. Miranda , R. Mirzoyan , M. Molero González , E. Molina , H. A. Mondal , A. Moralejo , D. Morcuende , T. Nakamori , C. Nanci , V. Neustroev , L. Nickel , M. Nievas Rosillo , C. Nigro , L. Nikolić , K. Nilsson , K. Nishijima , T. Njoh Ekoume , K. Noda , S. Nozaki , Y. Ohtani , A. Okumura , J. Otero-Santos , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , M. Peresano , M. Persic , M. Pihet , G. Pirola , F. Podobnik , P. G. Prada Moroni , E. Prandini , G. Principe , C. Priyadarshi , W. Rhode , M. Ribó , J. Rico , C. Righi , N. Sahakyan , T. Saito , K. Satalecka , F. G. Saturni , B. Schleicher , K. Schmidt , F. Schmuckermaier , J. L. Schubert , T. Schweizer , A. Sciaccaluga , G. Silvestri , J. Sitarek , V. Sliusar , D. Sobczynska , A. Spolon , A. Stamerra , J. Strišković , D. Strom , M. Strzys , Y. Suda , T. Surić , S. Suutarinen , H. Tajima , M. Takahashi , R. Takeishi , P. Temnikov , K. Terauchi , T. Terzić , M. Teshima S. Truzzi , A. Tutone , S. Ubach , J. van Scherpenberg , M. Vazquez Acosta , S. Ventura , I. Viale , C. F. Vigorito , V. Vitale , R. Walter , M. Will , C. Wunderlich , T. Yamamoto , G. Chon C. Díaz , M. Fiori , M. Lobo , G. Naletto , M. Polo , J. J. Rodríguez-Vázquez , P. Saha , L. Zampieri

Stellar Intensity Interferometric Capabilities of IACT Arrays

Sub-milliarcsecond imaging of nearby main sequence stars and binary systems can provide critical information on stellar phenomena such as rotational deformation, accretion effects, and the universality of starspot (sunspot) cycles.…

Instrumentation and Methods for Astrophysics · Physics 2018-01-22 Dave Kieda , Nolan Matthews

Augmentation of VERITAS Telescopes for Stellar Intensity Interferometry

In 2018-2019 the VERITAS VHE gamma-ray observatory was augmented with highspeed optical instrumentation and continuous data recording electronics to create a sensitive Stellar Intensity Interferometry (SII) observatory, VERITAS-SII. The…

Instrumentation and Methods for Astrophysics · Physics 2019-08-09 D. B. Kieda , VERITAS Collaboration , S. LeBohec , R cardon

Demonstration of stellar intensity interferometry with the four VERITAS telescopes

High angular resolution observations at optical wavelengths provide valuable insights in stellar astrophysics, directly measuring fundamental stellar parameters, and probing stellar atmospheres, circumstellar disks, elongation of rapidly…

Instrumentation and Methods for Astrophysics · Physics 2020-07-21 A. U. Abeysekara , W. Benbow , A. Brill , J. H. Buckley , J. L. Christiansen , A. J. Chromey , M. K. Daniel , J. Davis , A. Falcone , Q. Feng , J. P. Finley , L. Fortson , A. Furniss , A. Gent , 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 , S. Kumar , T. LeBohec , T. T. Y. Lin , M. Lundy , G. Maier , N. Matthews , P. Moriarty , R. Mukherjee 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 , G. H. Sembroski , S. P. Wakely , A. Weinstein , P. Wilcox , D. A. Williams , T. J Williamson

A Fiber Optic Based High Voltage System for Stellar Intensity Interferometry Observations

Beginning in Fall 2018, the VERITAS high energy gamma-ray observatory (Amado, AZ) was upgraded to enable Stellar Intensity Interferometry (SII) observations during bright moon conditions. The system potentially allows VERITAS to spatially…

Instrumentation and Methods for Astrophysics · Physics 2019-08-09 Rylee Cardon , Nolan Matthews , A. Udara Abeysekara , David Kieda

Performance of MAGIC stellar intensity interferometer and expansion to MAGIC + CTAO-LST1 stellar intensity interferometer

A new generation of optical intensity interferometers are emerging in recent years taking advantage of the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC SII (Stellar Intensity Interferometer) in La…

Instrumentation and Methods for Astrophysics · Physics 2025-06-06 Alejo Cifuentes , V. A. Acciari , F. Barnes , G. Chon , E. Colombo , J. Cortina , C. Delgado , C. Díaz , M. Fiori , D. Fink , T. Hassan , I. Jiménez Martínez , I. Jorge , D. Kerszberg , E. Lyard , G. Martínez , R. Mirzoyan , M. Polo , N. Produit , J. J. Rodríguez-Vázquez , P. Saha , T. Schweizer , D. Strom , R. Walter , C. W. Wunderlich , MAGIC Collaboration , CTAO-LST Project

Towards optical intensity interferometry for high angular resolution stellar astrophysics

Most neighboring stars are still detected as point sources and are beyond the angular resolution reach of current observatories. Methods to improve our understanding of stars at high angular resolution are investigated. Air Cherenkov…

Instrumentation and Methods for Astrophysics · Physics 2012-09-07 Paul D. Nunez

Gamma-ray Observations Under Bright Moonlight with VERITAS

Imaging atmospheric Cherenkov telescopes (IACTs) are equipped with sensitive photomultiplier tube (PMT) cameras. Exposure to high levels of background illumination degrades the efficiency of and potentially destroys these photo-detectors…

Instrumentation and Methods for Astrophysics · Physics 2017-03-14 S. Archambault , A. Archer , W. Benbow , R. Bird , E. Bourbeau , A. Bouvier , M. Buchovecky , V. Bugaev , J. V Cardenzana , M. Cerruti , L. Ciupik , M. P. Connolly , W. Cui , M. K. Daniel , M. Errando , A. Falcone , Q. Feng , J. P. Finley , H. Fleischhack , L. Fortson , A. Furniss , G. H. Gillanders , S. Griffin , D. Hanna , O. Hervet , J. Holder , G. Hughes , T. B. Humensky , M. Hütten , C. A. Johnson , P. Kaaret , P. Kar , M. Kertzman , D. Kieda , M. Krause , M. J. Lang , G. Maier , S. McArthur , P. Moriarty , R. Mukherjee , D. Nieto , S. O'Brien , R. A. Ong , A. N. Otte , N. Park , M. Pohl , A. Popkow , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , G. T. Richards , E. Roache , C. Rulten , I. Sadeh , G. H. Sembroski , K. Shahinyan , D. Staszak , I. Telezhinsky , S. Trepanier , S. P. Wakely , A. Weinstein , P. Wilcox , D. A. Williams , B. Zitzer

Towards the Intensity Interferometry Stellar Imaging System

The imminent availability of large arrays of large light collectors deployed to exploit atmospheric Cherenkov radiation for gamma-ray astronomy at more than 100GeV, motivates the growing interest in application of intensity interferometry…

Instrumentation and Methods for Astrophysics · Physics 2009-09-30 M. Daniel , W. J. de Wit , D. Dravins , D. Kieda , S. LeBohec , P. Nunez , E. Ribak

Proving the outstanding capabilities of IACTs in high time resolution optical astronomy

Imaging Atmospheric Cherenkov Telescopes (IACTs) are very-large telescopes designed to detect the nanosecond-timescale flashes produced within extended air showers. Because IACTs are sensitive to the Cherenkov light (UV/blue) and use…

Instrumentation and Methods for Astrophysics · Physics 2019-08-12 T. Hassan , M. K. Daniel

Imaging sub-milliarcsecond stellar features with intensity interferometry using air Cherenkov telescope arrays

Recent proposals have been advanced to apply imaging air Cherenkov telescope arrays to stellar intensity interferometry (SII). Of particular interest is the possibility of model-independent image recovery afforded by the good (u, v)-plane…

Solar and Stellar Astrophysics · Physics 2015-06-05 Paul D. Nunez , Richard Holmes , David Kieda , Janvida Rou , Stephan LeBohec

Status of the VERITAS Observatory

VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of astrophysical…

Astrophysics · Physics 2009-11-13 J. Holder , V. A. Acciari , E. Aliu , T. Arlen , M. Beilicke , W. Benbow , S. M. Bradbury , J. H. Buckley , V. Bugaev , Y. Butt , K. L. Byrum , A. Cannon , O. Celik , A. Cesarini , L. Ciupik , Y. C. K. Chow , P. Cogan , P. Colin , W. Cui , M. K. Daniel , T. Ergin , A. D. Falcone , S. J. Fegan , J. P. Finley , G. Finnegan , P. Fortin , L. F. Fortson , A. Furniss , G. H. Gillanders , J. Grube , R. Guenette , G. Gyuk , D. Hanna , E. Hays , D. Horan , C. M. Hui , T. B. Humensky , A. Imran , P. Kaaret , N. Karlsson , M. Kertzman , D. B. Kieda , J. Kildea , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , S. LeBohec , G. Maier , A. McCann , M. McCutcheon , P. Moriarty , R. Mukherjee , T. Nagai , J. Niemiec , R. A. Ong , D. Pandel , J. S. Perkins , M. Pohl , J. Quinn , K. Ragan , L. C. Reyes , 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

VERITAS: the Very Energetic Radiation Imaging Telescope Array System

The Very Energetic Radiation Imaging Telescope Array System (VERITAS) represents an important step forward in the study of extreme astrophysical processes in the universe. It combines the power of the atmospheric Cherenkov imaging technique…

Astrophysics · Physics 2008-11-26 T. C. Weekes

Mobile Intensity Interferometer for Stellar Observations (MI$^2$SO)

In recent years, intensity interferometry has seen renewed interest and successful application at Imaging Atmospheric Cherenkov Telescope arrays. These measurements are usually performed during bright moon periods while the instruments'…

Instrumentation and Methods for Astrophysics · Physics 2026-01-19 Christopher Ingenhütt , Pedro Batista , Gisela Anton , Alison Mitchell , Naomi Vogel , Adrian Zink , Andreas Zmija , Stefan Funk

Optical intensity interferometry lab tests in preparation of stellar diameter measurements at IACTs at GHz photon rates

Astronomical intensity interferometry enables quantitative measurements of the source geometry by measuring the photon fluxes in individual telescopes and correlating them, rather than correlating the electromagnetic waves' amplitudes. This…

Instrumentation and Methods for Astrophysics · Physics 2023-06-16 Andreas Zmija , Naomi Vogel , Gisela Anton , Dmitry Malyshev , Thilo Michel , Adrian Zink , Stefan Funk

Astro2020 White Paper State of the Profession: Intensity Interferometry

Recent advances in telescope design, photodetector efficiency, and high-speed electronic data recording and synchronization have created the observational capability to achieve unprecedented angular resolution for several thousand bright…

Instrumentation and Methods for Astrophysics · Physics 2019-08-01 David B. Kieda , Gisela Anton , Anastasia Barbano , Wystan Benbow , Colin Carlile , Michael Daniel , Dainis Dravins , Sean Griffin , Tarek Hassan , Jamie Holder , Stephan LeBohec , Nolan Matthews , Theresa Montaruli , Nicolas Produit , Josh Reynolds , Roland Walter , Luca Zampieri

Highlights from the VERITAS Blazar Program

VERITAS is an array of four 12-m imaging Cherenkov telescopes, sensitive to gamma rays in the energy range from 85 GeV to 30 TeV. VERITAS dedicates roughly 40% of its total observing time to blazars. We present recent highlights from the…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Jon Dumm