TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess
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TLDR
A number of testable predictions for gamma-ray and electron or positron experiments (up to approximately 100 TeV) are explored that can confirm the first "direct" detection of a cosmic-ray source.Abstract:
The Geminga pulsar has long been one of the most intriguing MeV-GeV gamma-ray point sources. We examine the implications of the recent Milagro gamma-ray Observatory detection of extended, multi-TeV gamma-ray emission from Geminga, finding that this reveals the existence of an ancient, powerful cosmic-ray accelerator that can plausibly account for the multi-GeV positron excess that has evaded explanation. We explore a number of testable predictions for gamma-ray and electron or positron experiments (up to approximately 100 TeV) that can confirm the first "direct" detection of a cosmic-ray source.read more
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Journal ArticleDOI
An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV
O. Adriani,G. C. Barbarino,G. A. Bazilevskaya,Roberto Bellotti,Mirko Boezio,E. A. Bogomolov,Lorenzo Bonechi,M. Bongi,V. Bonvicini,S. Bottai,A. Bruno,F. Cafagna,D. Campana,Per Carlson,Marco Casolino,G. Castellini,M. P. De Pascale,G. De Rosa,N. De Simone,V. Di Felice,A. M. Galper,L. A. Grishantseva,Petter Hofverberg,S. V. Koldashov,S. Y. Krutkov,A. N. Kvashnin,A. A. Leonov,V. Malvezzi,L. Marcelli,W. Menn,V. V. Mikhailov,E. Mocchiutti,Silvio Orsi,G. Osteria,P. Papini,Mark Pearce,P. Picozza,Marco Ricci,S. B. Ricciarini,M. Simon,Roberta Sparvoli,Piero Spillantini,Y. I. Stozhkov,Andrea Vacchi,E. Vannuccini,G. I. Vasilyev,S. A. Voronov,Y. T. Yurkin,G. Zampa,N. Zampa,V. G. Zverev +50 more
TL;DR: It is found that the positron fraction increases sharply over much of that range, in a way that appears to be completely inconsistent with secondary sources, and is concluded that a primary source, be it an astrophysical object or dark matter annihilation, is necessary.
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Dark Matter Candidates from Particle Physics and Methods of Detection
TL;DR: The identity of dark matter is a question of central importance in both astrophysics and particle physics as discussed by the authors, and recent progress has greatly expanded the list of well-motivated candidates and the possible signatures of the dark matter.
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Dark Matter Candidates from Particle Physics and Methods of Detection
TL;DR: The identity of dark matter is a question of central importance in both astrophysics and particle physics as mentioned in this paper, and recent progress has greatly expanded the list of well-motivated candidates.
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Cosmic Rays and Particle Physics
TL;DR: The study of high energy cosmic rays is a diversified field of observational and phenomenological physics addressing questions ranging from shock acceleration of charged particles in various astrophysical objects, via transport properties through galactic and extragalactic space, to questions of dark matter, and even to those of particle physics beyond the Standard Model including processes taking place in the earliest moments of our Universe as discussed by the authors.
Journal ArticleDOI
Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
Anushka Udara Abeysekara,Andrea Albert,Ruben Alfaro,C. Alvarez,J. D. Álvarez,R. Arceo,J.C. Arteaga-Velázquez,D. Avila Rojas,H. A. Ayala Solares,Ahron Barber,N. Bautista-Elivar,A. Becerril,E. Belmont-Moreno,Segev BenZvi,David Berley,A. Bernal,J. Braun,Chad Brisbois,Karen S. Caballero-Mora,T. Capistrán,A. Carramiñana,Sabrina Casanova,Sabrina Casanova,M. Castillo,U. Cotti,J. Cotzomi,S. Coutiño de León,C. De León,E. De la Fuente,Brenda Dingus,Michael DuVernois,Juan Carlos Diaz-Velez,R. W. Ellsworth,Kristi Engel,O. Enríquez-Rivera,D. W. Fiorino,Nissim Fraija,Jose Andres Garcia-Gonzalez,F. Garfias,M. Gerhardt,A. González Muñoz,M. M. Gonzalez,J. A. Goodman,Z. Hampel-Arias,J. P. Harding,S. Hernandez,A. Hernandez-Almada,J. Hinton,B. Hona,C. M. Hui,P. Hüntemeyer,A. Iriarte,A. Jardin-Blicq,Vikas Joshi,S. Kaufmann,David Kieda,Alejandro Lara,R. J. Lauer,W. H. Lee,Dirk Lennarz,H. León Vargas,J. T. Linnemann,Anna Lia Longinotti,G. Luis Raya,R. Luna-García,Ruben Lopez-Coto,K. Malone,S. S. Marinelli,Oscar Martínez,I. Martinez-Castellanos,J. Martínez-Castro,H. Martínez-Huerta,J. A. Matthews,P. Miranda-Romagnoli,E. Moreno,M. Mostafá,Lukas Nellen,M. Newbold,Mehr Nisa,R. Noriega-Papaqui,Rodrigo Pelayo,Jennifer Pretz,E. G. Pérez-Pérez,Z. Ren,C. D. Rho,C. Rivière,Daniel Rosa-Gonzalez,M. J. F. Rosenberg,E. Ruiz-Velasco,Humberto Ibarguen Salazar,F. Salesa Greus,A. Sandoval,Michael Schneider,Harm Schoorlemmer,G. Sinnis,A. J. Smith,R. W. Springer,P. Surajbali,Ignacio Taboada,Omar Tibolla,Kirsten Tollefson,I. Torres,T. N. Ukwatta,Giacomo Vianello,T. Weisgarber,S. Westerhoff,I. G. Wisher,Joshua A. Wood,T. Yapici,G. B. Yodh,Patrick Younk,Arnulfo Zepeda,Hao Zhou,Fan Guo,Joachim Hahn,Hui Li,Haocheng Zhang +116 more
TL;DR: In this paper, the authors reported the detection, using the High-Altitude Water Cherenkov Observatory (HAWC), of extended tera-electron volt gamma-ray emission coincident with the locations of two nearby middle-aged pulsars (Geminga and PSR B0656+14).
References
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Journal ArticleDOI
An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV
O. Adriani,G. C. Barbarino,G. A. Bazilevskaya,Roberto Bellotti,Mirko Boezio,E. A. Bogomolov,Lorenzo Bonechi,M. Bongi,V. Bonvicini,S. Bottai,A. Bruno,F. Cafagna,D. Campana,Per Carlson,Marco Casolino,G. Castellini,M. P. De Pascale,G. De Rosa,N. De Simone,V. Di Felice,A. M. Galper,L. A. Grishantseva,Petter Hofverberg,S. V. Koldashov,S. Y. Krutkov,A. N. Kvashnin,A. A. Leonov,V. Malvezzi,L. Marcelli,W. Menn,V. V. Mikhailov,E. Mocchiutti,Silvio Orsi,G. Osteria,P. Papini,Mark Pearce,P. Picozza,Marco Ricci,S. B. Ricciarini,M. Simon,Roberta Sparvoli,Piero Spillantini,Y. I. Stozhkov,Andrea Vacchi,E. Vannuccini,G. I. Vasilyev,S. A. Voronov,Y. T. Yurkin,G. Zampa,N. Zampa,V. G. Zverev +50 more
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Journal ArticleDOI
Bremsstrahlung, Synchrotron Radiation, and Compton Scattering of High-Energy Electrons Traversing Dilute Gases
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Jin Chang,James H. Adams,H. S. Ahn,G. L. Bashindzhagyan,M. Christl,O. Ganel,T. G. Guzik,Joachim Isbert,K. C. Kim,E. N. Kuznetsov,M. I. Panasyuk,Alexander D. Panov,Wolfgang Schmidt,Eun-Suk Seo,N. V. Sokolskaya,John W. Watts,John P. Wefel,J. Wu,V. I. Zatsepin +18 more
TL;DR: An excess of galactic cosmic-ray electrons at energies of ∼300–800 GeV is reported, which indicates a nearby source of energetic electrons, or the electrons could arise from the annihilation of dark matter particles.
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