Results 41 to 50 of about 42,851 (177)

Energy and Flux Measurements of Ultra-High Energy Cosmic Rays Observed During the First ANITA Flight [PDF]

, 2016
The first flight of the Antarctic Impulsive Transient Antenna (ANITA) experiment recorded 16 radio signals that were emitted by cosmic-ray induced air showers. For 14 of these events, this radiation was reflected from the ice.
A. Connolly, A. Javaid, A. Romero-Wolf, A.G. Vieregg, Aab, Aab, Abu-Zayyad, Abu-Zayyad, Alvarez-Muñiz, Alvarez-Muñiz, Alvarez-Muñiz, Alvarez-Muñiz, Alvarez-Muñiz, Apel, Apel, Ardouin, B. Rotter, B.C. Mercurio, B.F. Rauch, Belov, Belov, Besson, Bezyazeekov, Buitink, C. Chen, C. Hast, C. Miki, C.J. Naudet, C.L. Heber, D. García-Fernández, D. Goldstein, D. Saltzberg, D. Seckel, D. Urdaneta, D. Walz, D.Z. Besson, de Vries, de Vries, E. Lusczek, E. Zas, F. Wu, G.S. Varner, Gorham, H. Schoorlemmer, Hoover, Huege, J. Alvarez-Muñiz, J. Kowalski, J. Lam, J. Nam, J. Ng, J. Roberts, J.G. Learned, J.J. Beatty, J.M. Clem, J.T. Link, K. Belov, K. Mulrey, K. Palladino, K. Reil, L. Ruckman, Liu, M. Rosen, M.A. DuVernois, M.H. Israel, Mandolesi, Motloch, Nelles, Nelles, P. Allison, P. Chen, P. Miočinović, P.F. Dowkontt, P.W. Gorham, R.C. Field, R.J. Nichol, Revenu, Romero-Wolf, Romero-Wolf, S. Hoover, S. Matsuno, S.A. Wissel, S.W. Barwick, Schellart, Shepard, T. Huege, The Pierre Auger Collaboration, The Pierre Auger Collaboration, Tokuno, V. Bugaev, W.R. Binns, W.R. Carvalho Jr., Šmída   +92 more
core   +3 more sources

Analytic Solutions of Ultra-High Energy Cosmic Ray Nuclei Revisited

, 2010
The chemical composition of ultra-high energy cosmic rays is a key question in particle astrophysics. The measured composition, inferred from the elongation rates of cosmic ray showers, looks in general very different from the initial source composition:
Ahlers, Markus, Taylor, Andrew M.
core   +1 more source

Non-variable cosmologically distant gamma-ray emitters as an imprint of propagation of ultra-high-energy protons

, 2011
The acceleration cites of ultra-high-energy (UHE) protons can be traced by the footprint left by these particles propagating through cosmic microwave background (CMB) radiation.
A. Yu. Prosekin, Aharonian, Aharonian, Aharonian, Ando, Atwood, Blasi, Dermer, Dolag, Dolag, Essey, F. A. Aharonian, Franceschini, Gabici, Kelner, Kotera, Lehmer, Neronov, Neronov, Romano, Ryu, S. R. Kelner, Sigl, Tavecchio, Taylor   +24 more
core   +1 more source

Probing the Dipole of the Diffuse Gamma-Ray Background

The Astrophysical Journal Letters
We measured the dipole of the diffuse γ -ray background (DGB), identifying a highly significant time-independent signal coincidental with that of the Pierre Auger UHECR.
A. Kashlinsky, F. Atrio-Barandela, C. S. Shrader   +2 more
doaj   +1 more source

Signatures of Topological Defects

, 1998
We argue that due to various restrictions cosmic strings and monopole-string networks are not likely to produce the observed flux of ultra-high energy cosmic rays (UHECR). Among the topological defects studied so far, the most promising UHECR sources are
A. B. Migdal, A. J. Gill, A. Vilenkin, Alexander Vilenkin, C. J. Hogan, C. T. Hill, C. T. Hill, C. T. Norman, D. J. Bird, E. P. S. Shellard, E. Waxman, F. A. Aharonian, F. A. Aharonian, G. R. Vincent, G. R. Vincent, G. Sigl, G. T. Zatsepin, J. Bordes, J. F. Navarro, J. H. MacGibbon, J. P. Ostriker, J. P. Rachen, K. Greisen, K. Kasahara, L. D. Landau, L. Maspieri, M. B. Hindmarsh, M. Hoshino, M. Vietri, N. Hayashida, P. Bhattacharjee, P. Bhattacharjee, P. Bhattacharjee, P. Bhattacharjee, P. L. Biermann, P. Sreekumar, Pasquale Blasi, R. Brandenberger, R. Brandenberger, R. J. Protheroe, R. J. Scherrer, R. L. Davis, R. L. Davis, R. Protheroe, R. Protheroe, S. Bonazzola, T. J. Weiler, T. Vachaspati, V. Berezinsky, V. Berezinsky, V. Berezinsky, V. Berezinsky, V. Berezinsky, V. Berezinsky, V. Berezinsky, V. S. Berezinsky, V. S. Berezinsky, V. S. Berezinsky, Veniamin Berezinsky, W. H. Ip   +59 more
core   +4 more sources

Prospects for direct cosmic ray mass measurements through the Gerasimova-Zatsepin effect [PDF]

, 2008
The Solar radiation field may break apart ultra high energy cosmic nuclei, after which both remnants will be deflected in the interplanetary magnetic field in different ways.
Abraham, Akasofu, Antoni, Epele, Gerasimova, H. Falcke, Hörandel, J. Hörandel, J. Kuijpers, Karakula, Medina-Tanco, S. Lafèbre, Zatsepin   +12 more
core   +2 more sources

Large-scale Cosmic-ray Anisotropies with 19 yr of Data from the Pierre Auger Observatory

The Astrophysical Journal
Results are presented for the measurement of large-scale anisotropies in the arrival directions of ultra–high-energy cosmic rays detected at the Pierre Auger Observatory during 19 yr of operation, prior to AugerPrime, the upgrade of the observatory.
A. Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte, K. Almeida Cheminant, A. Almela, R. Aloisio, J. Alvarez-Muñiz, A. Ambrosone, J. Ammerman Yebra, G. A. Anastasi, L. Anchordoqui, B. Andrada, L. Andrade Dourado, S. Andringa, L. Apollonio, C. Aramo, P. R. Araújo Ferreira, E. Arnone, J. C. Arteaga Velázquez, P. Assis, G. Avila, E. Avocone, A. Bakalova, F. Barbato, A. Bartz Mocellin, J. A. Bellido, C. Berat, M. E. Bertaina, G. Bhatta, M. Bianciotto, P. L. Biermann, V. Binet, K. Bismark, T. Bister, J. Biteau, J. Blazek, C. Bleve, J. Blümer, M. Boháčová, D. Boncioli, C. Bonifazi, L. Bonneau Arbeletche, N. Borodai, J. Brack, P. G. Brichetto Orchera, F. L. Briechle, A. Bueno, S. Buitink, M. Buscemi, M. Büsken, A. Bwembya, K. S. Caballero-Mora, S. Cabana-Freire, L. Caccianiga, F. Campuzano, R. Caruso, A. Castellina, F. Catalani, G. Cataldi, L. Cazon, M. Cerda, B. Čermáková, A. Cermenati, J. A. Chinellato, J. Chudoba, L. Chytka, R. W. Clay, A. C. Cobos Cerutti, R. Colalillo, R. Conceição, A. Condorelli, G. Consolati, M. Conte, F. Convenga, D. Correia dos Santos, P. J. Costa, C. E. Covault, M. Cristinziani, C. S. Cruz Sanchez, S. Dasso, K. Daumiller, B. R. Dawson, R. M. de Almeida, B. de Errico, J. de Jesús, S. J. de Jong, J. R. T. de Mello Neto, I. De Mitri, J. de Oliveira, D. de Oliveira Franco, F. de Palma, V. de Souza, E. De Vito, A. Del Popolo, O. Deligny, N. Denner, L. Deval, A. di Matteo, C. Dobrigkeit, J. C. D’Olivo, L. M. Domingues Mendes, Q. Dorosti, J. C. dos Anjos, R. C. dos Anjos, J. Ebr, F. Ellwanger, M. Emam, R. Engel, I. Epicoco, M. Erdmann, A. Etchegoyen, C. Evoli, H. Falcke, G. Farrar, A. C. Fauth, T. Fehler, F. Feldbusch, A. Fernandes, B. Fick, J. M. Figueira, P. Filip, A. Filipčič, T. Fitoussi, B. Flaggs, T. Fodran, M. Freitas, T. Fujii, A. Fuster, C. Galea, B. García, C. Gaudu, P. L. Ghia, U. Giaccari, F. Gobbi, F. Gollan, G. Golup, M. Gómez Berisso, P. F. Gómez Vitale, J. P. Gongora, J. M. González, N. González, D. Góra, A. Gorgi, M. Gottowik, F. Guarino, G. P. Guedes, E. Guido, L. Gülzow, S. Hahn, P. Hamal, M. R. Hampel, P. Hansen, V. M. Harvey, A. Haungs, T. Hebbeker, C. Hojvat, J. R. Hörandel, P. Horvath, M. Hrabovský, T. Huege, A. Insolia, P. G. Isar, P. Janecek, V. Jilek, J. Jurysek, K.-H. Kampert, B. Keilhauer, A. Khakurdikar, V. V. Kizakke Covilakam, H. O. Klages, M. Kleifges, F. Knapp, J. Köhler, F. Krieger, M. Kubatova, N. Kunka, B. L. Lago, N. Langner, M. A. Leigui de Oliveira, Y. Lema-Capeans, A. Letessier-Selvon, I. Lhenry-Yvon, L. Lopes, J. P. Lundquist, A. Machado Payeras, D. Mandat, B. C. Manning, P. Mantsch, F. M. Mariani, A. G. Mariazzi, I. C. Mariş, G. Marsella, D. Martello, S. Martinelli, O. Martínez Bravo, M. A. Martins, H.-J. Mathes, J. Matthews, G. Matthiae, E. Mayotte, S. Mayotte, P. O. Mazur, G. Medina-Tanco, J. Meinert, D. Melo, A. Menshikov, C. Merx, S. Michal, M. I. Micheletti, L. Miramonti, S. Mollerach, F. Montanet, L. Morejon, K. Mulrey, R. Mussa, W. M. Namasaka, S. Negi, L. Nellen, K. Nguyen, G. Nicora, M. Niechciol, D. Nitz, D. Nosek, V. Novotny, L. Nožka, A. Nucita, L. A. Núñez, C. Oliveira, M. Palatka, J. Pallotta, S. Panja, G. Parente, T. Paulsen, J. Pawlowsky, M. Pech, J. Pȩkala, R. Pelayo, V. Pelgrims, L. A. S. Pereira, E. E. Pereira Martins, C. Pérez Bertolli, L. Perrone, S. Petrera, C. Petrucci, T. Pierog, M. Pimenta, M. Platino, B. Pont, M. Pothast, M. Pourmohammad Shahvar, P. Privitera, M. Prouza, S. Querchfeld, J. Rautenberg, D. Ravignani, J. V. Reginatto Akim, A. Reuzki, J. Ridky, F. Riehn, M. Risse, V. Rizi, E. Rodriguez, J. Rodriguez Rojo, M. J. Roncoroni, S. Rossoni, M. Roth, E. Roulet, A. C. Rovero, A. Saftoiu, M. Saharan, F. Salamida, H. Salazar, G. Salina, P. Sampathkumar, J. D. Sanabria Gomez, F. Sánchez, E. M. Santos, E. Santos, F. Sarazin, R. Sarmento, R. Sato, C. M. Schäfer, V. Scherini, H. Schieler, M. Schimassek, M. Schimp, D. Schmidt, O. Scholten, H. Schoorlemmer, P. Schovánek, F. G. Schröder, J. Schulte, T. Schulz, S. J. Sciutto, M. Scornavacche, A. Sedoski, A. Segreto, S. Sehgal, S. U. Shivashankara, G. Sigl, K. Simkova, F. Simon, R. Šmída, P. Sommers, R. Squartini, M. Stadelmaier, S. Stanič, J. Stasielak, P. Stassi, S. Strähnz, M. Straub, T. Suomijärvi, A. D. Supanitsky, Z. Svozilikova, Z. Szadkowski, F. Tairli, A. Tapia, C. Taricco, C. Timmermans, O. Tkachenko, P. Tobiska, C. J. Todero Peixoto, B. Tomé, Z. Torrès, A. Travaini, P. Travnicek, M. Tueros, M. Unger, R. Uzeiroska, L. Vaclavek, M. Vacula, J. F. Valdés Galicia, L. Valore, E. Varela, V. Vašíčková, A. Vásquez-Ramírez, D. Veberič, I. D. Vergara Quispe, V. Verzi, J. Vicha, J. Vink, S. Vorobiov, C. Watanabe, A. A. Watson, A. Weindl, M. Weitz, L. Wiencke, H. Wilczyński, D. Wittkowski, B. Wundheiler, B. Yue, A. Yushkov, O. Zapparrata, E. Zas, D. Zavrtanik, M. Zavrtanik, The Pierre Auger Collaboration   +357 more
doaj   +1 more source

Jet Lorentz Factor Constraint for GRB 221009A Based on the Optical Depth of the TeV Photons

The Astrophysical Journal Letters, 2023
The recent detection of teraelectronvolt (TeV) photons from the record-breaking gamma-ray burst GRB 221009A during its prompt phase poses challenges for constraining its Lorentz factor.
Duan-Yuan Gao, Yuan-Chuan Zou
doaj   +1 more source

Atmospheric Calorimetry above 10$^{19}$ eV: Shooting Lasers at the Pierre Auger Cosmic-Ray Observatory

, 2008
The Pierre Auger Cosmic-Ray Observatory uses the earth's atmosphere as a calorimeter to measure extensive air-showers created by particles of astrophysical origin. Some of these particles carry joules of energy.
[Pierre Auger Collaboration], Bleve C [Pierre Auger Collaboration], Fick B, Keilhauer B [Pierre Auger Collaboration], Keilhauer B [Pierre Auger Collaboration], Knapik R [Pierre Auger Collaboration], Lawrence Wiencke, Nitz D [Pierre Auger Collaboration], Pierre Auger Collaboration [J Abraham ], Pierre Auger Collaboration [J Abraham ], Prouza M [Pierre Auger Collaboration], S Y BenZvi [Pierre Auger Collaboration], Smith J D, SY BenZvi [Pierre Auger Collaboration], the Pierre Auger Collaboration   +14 more
core   +1 more source

Cascaded Gamma-Ray Emission Associated with the KM3NeT Ultrahigh-energy Event KM3-230213A

The Astrophysical Journal Letters
A neutrino-like event with an energy of ∼220 PeV was recently detected by the KM3NeT/ARCA telescope. If this neutrino comes from an astrophysical source or from the interaction of an ultrahigh-energy cosmic ray in the intergalactic medium, the ultrahigh ...
Ke Fang, Francis Halzen, Dan Hooper
doaj   +1 more source