K
K. Ragan
Researcher at McGill University
Publications - 13
Citations - 669
K. Ragan is an academic researcher from McGill University. The author has contributed to research in topics: Blazar & Fermi Gamma-ray Space Telescope. The author has an hindex of 11, co-authored 13 publications receiving 621 citations.
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Journal ArticleDOI
Constraints on cosmic rays, magnetic fields, and dark matter from gamma-ray observations of the coma cluster of galaxies with veritas and fermi
T. Arlen,T. Aune,M. Beilicke,Wystan Benbow,A. Bouvier,J. H. Buckley,V. Bugaev,Karen Byrum,A. Cannon,A. Cesarini,L. Ciupik,E. Collins-Hughes,M. P. Connolly,Wei Cui,R. Dickherber,J. Dumm,Abraham D. Falcone,S. Federici,Q. Feng,J. P. Finley,G. Finnegan,Lucy Fortson,A. Furniss,N. Galante,D. Gall,S. Godambe,S. Griffin,J. Grube,Geza Gyuk,Jamie Holder,H. Huan,Gareth Hughes,T. B. Humensky,A. Imran,P. Kaaret,N. Karlsson,M. Kertzman,Y. Khassen,David Kieda,H. Krawczynski,F. Krennrich,K. Lee,A. S. Madhavan,Gernot Maier,P. Majumdar,S. McArthur,A. McCann,P. Moriarty,R. Mukherjee,T. J. N. Nelson,A. O'Faolain de Bhroithe,R. A. Ong,M. Orr,A. N. Otte,N. H. Park,J. S. Perkins,Martin Pohl,H. Prokoph,John L. Quinn,K. Ragan,L. C. Reyes,P. T. Reynolds,E. Roache,J. Ruppel,D. B. Saxon,M. Schroedter,G. H. Sembroski,C. Skole,A. W. Smith,I. Telezhinsky,G. Tešić,M. Theiling,S. Thibadeau,K. Tsurusaki,A. Varlotta,M. Vivier,S. P. Wakely,J. E. Ward,A. Weinstein,R. Welsing,David A. Williams,B. Zitzer,Christoph Pfrommer,A. Pinzke +83 more
TL;DR: In this paper, the gamma-ray upper limits of the Coma galaxy cluster with the VERITAS array of imaging Cerenkov telescopes, with complementing Fermi Large Area Telescope observations at GeV energies, were investigated.
Journal ArticleDOI
RAPID TeV GAMMA-RAY FLARING OF BL LACERTAE
T. Arlen,T. Aune,M. Beilicke,Wystan Benbow,A. Bouvier,J. H. Buckley,V. Bugaev,A. Cesarini,L. Ciupik,M. P. Connolly,Wei Cui,R. Dickherber,J. Dumm,Manel Errando,Abraham D. Falcone,S. Federici,Q. Feng,J. P. Finley,G. Finnegan,Lucy Fortson,A. Furniss,N. Galante,D. Gall,S. Griffin,J. Grube,Geza Gyuk,D. S. Hanna,Jamie Holder,T. B. Humensky,P. Kaaret,N. Karlsson,M. Kertzman,Y. Khassen,David Kieda,H. Krawczynski,F. Krennrich,Gernot Maier,P. Moriarty,R. Mukherjee,T. J. N. Nelson,A. O'Faolain de Bhroithe,R. A. Ong,M. Orr,N. H. Park,J. S. Perkins,J. S. Perkins,A. Pichel,Martin Pohl,H. Prokoph,John L. Quinn,K. Ragan,Luis C. Reyes,P. T. Reynolds,E. Roache,D. B. Saxon,M. Schroedter,G. H. Sembroski,D. Staszak,I. Telezhinsky,G. Tešić,M. Theiling,K. Tsurusaki,A. Varlotta,S. Vincent,S. P. Wakely,T. C. Weekes,A. Weinstein,R. Welsing,David A. Williams,B. Zitzer,Svetlana G. Jorstad,Svetlana G. Jorstad,Nicholas R. MacDonald,Alan P. Marscher,Paul S. Smith,R. C. Walker,Talvikki Hovatta,Joseph L. Richards,Walter Max-Moerbeck,Anthony C. S. Readhead,Matthew L. Lister,Yuri Y. Kovalev,Alexander B. Pushkarev,Mark Gurwell,Anne Lähteenmäki,E. Nieppola,Merja Tornikoski,Emilia Järvelä +87 more
TL;DR: A very rapid TeV gamma-ray flare from BL Lacertae was detected by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) with a 34.6 minute exposure as discussed by the authors.
Journal ArticleDOI
Constraints on Cosmic Rays, Magnetic Fields, and Dark Matter from Gamma-Ray Observations of the Coma Cluster of Galaxies with VERITAS and Fermi
A. Pinzke,T. Arlen,T. Aune,M. Beilicke,Wystan Benbow,A. Bouvier,J. H. Buckley,V. Bugaev,Karen Byrum,A. Cannon,A. Cesarini,L. Ciupik,E. Collins-Hughes,M. P. Connolly,Wei Cui,R. Dickherber,J. Dumm,Abraham D. Falcone,S. Federici,Q. Feng,J. P. Finley,G. Finnegan,Lucy Fortson,A. Furniss,N. Galante,D. Gall,S. Godambe,S. Griffin,J. Grube,Geza Gyuk,Jamie Holder,H. Huan,Gareth Hughes,T. B. Humensky,A. Imran,P. Kaaret,N. Karlsson,M. Kertzman,Y. Khassen,David Kieda,H. Krawczynski,F. Krennrich,K. Lee,A. S Madhavan,Gernot Maier,Pratik Majumdar,S. McArthur,A. McCann,P. Moriarty,R. Mukherjee,T. J. N. Nelson,A. O'Faolain de Bhroithe,R. A. Ong,M. Orr,A. N. Otte,N. H. Park,J. S. Perkins,Martin Pohl,H. Prokoph,John L. Quinn,K. Ragan,L. C. Reyes,P. T. Reynolds,E. Roache,J. Ruppel,D. B. Saxon,M. Schroedter,G. H. Sembroski,C. Skole,A. W. Smith,I. Telezhinsky,G. Tešić,M. Theiling,S. Thibadeau,K. Tsurusaki,A. Varlotta,M. Vivier,S. P. Wakely,J. E. Ward,A. Weinstein,R. Welsing,David A. Williams,B. Zitzer +82 more
TL;DR: The gamma-ray upper limits at the 99% confidence level were measured to be on the order of (2-5*10^-8\ ph. as discussed by the authors, where ε = 0.
Journal ArticleDOI
Rapid TeV Gamma-Ray Flaring of BL Lacertae
T. Arlen,T. Aune,M. Beilicke,Wystan Benbow,A. Bouvier,J. H. Buckley,V. Bugaev,A. Cesarini,L. Ciupik,M. P. Connolly,Wei Cui,R. Dickherber,J. Dumm,Manel Errando,Abraham D. Falcone,S. Federici,Q. Feng,J. P. Finley,G. Finnegan,Lucy Fortson,A. Furniss,N. Galante,D. Gall,S. Griffin,J. Grube,Geza Gyuk,D. S. Hanna,Jamie Holder,T. B. Humensky,P. Kaaret,N. Karlsson,M. Kertzman,Y. Khassen,David Kieda,H. Krawczynski,F. Krennrich,Gernot Maier,P. Moriarty,R. Mukherjee,T. J. N. Nelson,A. O'Faolain de Bhroithe,R. A. Ong,M. Orr,N. H. Park,J. S. Perkins,J. S. Perkins,A. Pichel,Martin Pohl,H. Prokoph,John L. Quinn,K. Ragan,Luis C. Reyes,P. T. Reynolds,E. Roache,D. B. Saxon,M. Schroedter,G. H. Sembroski,D. Staszak,I. Telezhinsky,G. Tešić,M. Theiling,K. Tsurusaki,A. Varlotta,S. Vincent,S. P. Wakely,T. C. Weekes,A. Weinstein,R. Welsing,David A. Williams,B. Zitzer,Svetlana G. Jorstad,Svetlana G. Jorstad,Nicholas R. MacDonald,Alan P. Marscher,Paul S. Smith,R. C. Walker,Talvikki Hovatta,Joseph L. Richards,Walter Max-Moerbeck,Anthony C. S. Readhead,Matthew L. Lister,Yuri Y. Kovalev,Alexander B. Pushkarev,Mark Gurwell,Anne Lähteenmäki,E. Nieppola,Merja Tornikoski,Emilia Järvelä +87 more
TL;DR: In this paper, a very rapid TeV gamma-ray flare from BL Lacertae was detected with the Very Energetic Radiation Imaging Telescope Array System (VERITAS).
Journal ArticleDOI
Discovery of High-energy and Very High Energy γ Ray Emission from the Blazar RBS 0413
E. Aliu,S. Archambault,T. Arlen,T. Aune,M. Beilicke,Wystan Benbow,Markus Böttcher,A. Bouvier,S. M. Bradbury,J. H. Buckley,V. Bugaev,Karen Byrum,A. Cannon,A. Cesarini,L. Ciupik,E. Collins-Hughes,M. P. Connolly,Paolo De Coppi,Wei Cui,G. Decerprit,R. Dickherber,J. Dumm,Manel Errando,Abraham D. Falcone,Q. Feng,J. P. Finley,G. Finnegan,Lucy Fortson,A. Furniss,N. Galante,D. Gall,S. Godambe,S. Griffin,J. Grube,Geza Gyuk,D. S. Hanna,Keith Hawkins,Jamie Holder,H. Huan,Gareth Hughes,T. B. Humensky,P. Kaaret,N. Karlsson,M. Kertzman,Y. Khassen,David Kieda,H. Krawczynski,F. Krennrich,M. J. Lang,K. Lee,A. S. Madhavan,Gernot Maier,P. Majumdar,S. McArthur,A. McCann,P. Moriarty,R. Mukherjee,R. A. Ong,M. Orr,A. N. Otte,N. Palma,N. H. Park,J. S. Perkins,J. S. Perkins,A. Pichel,Martin Pohl,H. Prokoph,John L. Quinn,K. Ragan,L. C. Reyes,P. T. Reynolds,E. Roache,H. J. Rose,J. Ruppel,D. B. Saxon,M. Schroedter,G. H. Sembroski,G. D. Şentürk,A. W. Smith,D. Staszak,I. Telezhinsky,G. Tešić,M. Theiling,S. Thibadeau,K. Tsurusaki,A. Varlotta,M. Vivier,S. P. Wakely,J. E. Ward,T. C. Weekes,A. Weinstein,T. Weisgarber,David A. Williams,B. Zitzer,P. Fortin,D. Horan +95 more
TL;DR: In this paper, the authors reported the discovery of high-energy (HE; E > 0.1 GeV) and very high energy (VHE, E > 100 GeV), γ-ray emission from the high-frequency-peaked BL Lac object RBS 0413.