Results 41 to 50 of about 29,691 (229)

Constraining Dark Matter and Ultra-High Energy Cosmic Ray Sources with Fermi-LAT Diffuse Gamma Ray Background [PDF]

, 2016
We use the recent measurement of the isotropic $\gamma$-ray background (IGRB) by Fermi LAT and analysis of the contribution of unresolved point $\gamma$-ray sources to IGRB to build constraints on the models of ultra-high cosmic rays (UHECR) origin.
O. Kalashev
semanticscholar   +1 more source

Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-high-energy Cosmic Rays [PDF]

Astrophysical Journal, 2020
Evidence for a large-scale supergalactic cosmic-ray multiplet (arrival directions correlated with energy) structure is reported for ultra-high-energy cosmic-ray (UHECR) energies above 1019 eV using 7 years of data from the Telescope Array (TA) surface ...
Telescope Array Collaboration R.U. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Azuma, E. Barcikowski, J. Belz, D. Bergman, S. Blake, R. Cady, B. Cheon, J. Chiba, M. Chikawa, A. Matteo, T. Fujii, K. Fujisue, K. Fujita, R. Fujiwara, M. Fukushima, G. Furlich, W. Hanlon, M. Hayashi, Y. Hayashi, N. Hayashida, K. Hibino, R. Higuchi, K. Honda, D. Ikeda, T. Inadomi, N. Inoue, T. Ishii, R. Ishimori, H. Ito, D. Ivanov, H. Iwakura, H. Jeong, S. Jeong, C. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, S. Kasami, H. Kawai, S. Kawakami, S. Kawana, K. Kawata, E. Kido, H. Kim, J. H. Kim, M. H. Kim, S. Kim, S. Kishigami, V. Kuzmin, M. Kuznetsov, Y. Kwon, K. H. Lee, B. Lubsandorzhiev, J. Lundquist, K. Machida, K. Martens, H. Matsumiya, T. Matsuyama, J. Matthews, R. Mayta, M. Minamino, K. Mukai, I. Myers, S. Nagataki, K. Nakai, R. Nakamura, T. Nakamura, Y. Nakamura, T. Nonaka, H. Oda, S. Ogio, M. Ohnishi, H. Ohoka, Y. Oku, T. Okuda, Y. Omura, M. Ono, R. Onogi, A. Oshima, S. Ozawa, I. H. Park, M. Pshirkov, J. Remington, D. Rodríguez, G. Rubtsov, D. Ryu, H. Sagawa, R. Sahara, Y. Saito, N. Sakaki, T. Sako, N. Sakurai, K. Sano, L. Scott, T. Seki, K. Sekino, P. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. Shin, H. Shin, J. Smith, P. Sokolsky, N. Sone, B. Stokes, S. Stratton, T. Stroman, T. Suzawa, Y. Takagi, Y. Takahashi, M. Takamura, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanoue, S. Thomas, G. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, Y. Uchihori, S. Udo, T. Uehama, F. Urban, T. Wong, K. Yada, M. Yamamoto, H. Yamaoka, K. Yamazaki, J. Yang, K. Yashiro, M. Yosei, H. Yoshii, Y. Zhezher, Z. Institute, Department of Applied Physics, Astronomy, U. Utah, Salt lake City, Utah., Usa, T. Z. F. O. Science, Engineering, S. University, Saitama, Japan., Graduate School of Science, Tokyo Institute of Technology, Meguro, Tokyo, T. Z. F. O. Science, Hanyang University, Seongdong-gu, Seoul., Korea, Tokyo University of Science, Noda, Chiba, K. University, Higashi Osaka, Osaka, Service de Physique Th'eorique, Universit́e Libre de Bruxelles, Brussels, R Belgium, T. I. F. C. R. Research, K. University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, Inst. for Nucl. Research, U. Tokyo, Kashiwa, O. University, K. I. F. T. Physics, M. Universe, Todai Institutes for Advanced Study, Information Science, Technology, Shinshu University, Nagano, Faculty of Electrical Engineering, Kanagawa University, Yokohama, Kanagawa, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Kofu, Yamanashi, E. R. Institute, Bunkyo-ku, A. G. S. O. Science, Technology Institute of Engineering, Astrophysical Big Bang Laboratory, Riken, Wako, S. University, Jang-an-gu, Suwon, T. University, Setagaya-ku, Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia., Faculty of Electrical Engineering, Science, Shibaura Institute of Technology, Minato-ku, Department of Materials Science, O. University, Neyagawa-shi, C. University, Y. University, Seodaemun-gu, Faculty of Computer Science, K. University, Kochi, Nambu Yoichiro Institute of Theoretical, E. Physics, D. Sciences, Ritsumeikan University, Kusatsu, Shiga, Advanced Research Institute for Science, W. University, Shinjuku-ku, Sternberg Astronomical Institute, M. University, School of Physical Sciences, Ulsan National Institute of Science, UNIST-gil, Ulsan, Rutgers University - The State University of New Jersey, Piscataway, N. Jersey., G. S. O. Sciences, H. University, Hiroshima, Institute of Particle, Nuclear Studies, Kek, Tsukuba, Ibaraki, National Institute of Advanced Industrial Science, Ceico, I. O. Physics, C. A. O. Sciences, Prague, Czech Republic, Institute for Fundamental Physics of the Universe, Ewha Womans University, Seodaaemun-gu, E. University, Matsuyama, Ehime   +267 more
semanticscholar   +1 more source

A Method to Estimate the Primary Mass of Ultrahigh-energy Cosmic Rays from Measurements of the Depth of the Shower Maximum and the Muon Content

The Astrophysical Journal, 2023
The origin and mass composition of ultrahigh-energy cosmic rays is one of the big open questions of modern physics. Estimating the mass of ultrahigh-energy cosmic rays always involves the comparison of data with simulations using hadronic interaction ...
Maximilian Stadelmaier
doaj   +1 more source

BLAZARS AS ULTRA-HIGH-ENERGY COSMIC-RAY SOURCES: IMPLICATIONS FOR TeV GAMMA-RAY OBSERVATIONS [PDF]

, 2011
The spectra of BL Lac objects and Fanaroff–Riley I radio galaxies are commonly explained by the one-zone leptonic synchrotron self-Compton (SSC) model. Spectral modeling of correlated multiwavelength data gives the comoving magnetic field strength, the ...
K. Murase, C. Dermer, H. Takami, G. Migliori   +3 more
semanticscholar   +1 more source

Feasibility of Correlated Extensive Air Shower Detection with a Distributed Cosmic-Ray Network

The Astrophysical Journal, 2023
We explore the sensitivity offered by a global network of cosmic-ray detectors to a novel, unobserved phenomenon: widely separated simultaneous extended air showers.
Eric K. Albin, Daniel Whiteson
doaj   +1 more source

Ultra-high-energy cosmic ray acceleration by relativistic blast waves [PDF]

, 1998
We consider the acceleration of charged particles at the ultrarelativistic shocks, with Lorentz factors Γs≫1 relative to the upstream medium, arising in relativistic fireball models of gamma-ray bursts (GRBs).
Y. Gallant, A. Achterberg
semanticscholar   +1 more source

Has telescope array discovered electroweak monopole?

Physics Letters B
We propose the ultra high energy cosmic ray recently detected by Telescope Array to be the electroweak monopole, and present theoretical arguments which support this.
Y.M. Cho, Franklin H. Cho
doaj   +1 more source

Highlights from the Telescope Array

EPJ Web of Conferences, 2016
The Telescope Array measures the properties of ultra high energy cosmic ray induced extensive air showers. We do this using a variety of techniques including an array of scintillator detectors to sample the footprint of the air shower when it reaches the
Matthews J.N.
doaj   +1 more source

On ultra-high energy cosmic ray acceleration at the termination shock of young pulsar winds [PDF]

, 2014
Pulsar wind nebulae (PWNe) are outstanding accelerators in Nature, in the sense that they accelerate electrons up to the radiation reaction limit. Motivated by this observation, this paper examines the possibility that young pulsar wind nebulae can ...
M. Lemoine, K. Kotera, J. P'etri
semanticscholar   +1 more source

The Limited Contribution of Low- and High-luminosity Gamma-Ray Bursts to Ultra-high-energy Cosmic Rays [PDF]

Astrophysical Journal, 2018
The acceleration site for ultra-high-energy cosmic rays (UHECRs) is still an open question despite extended research. In this paper, we reconsider the prompt phase of gamma-ray bursts (GRBs) as a possible candidate for this acceleration and constrain the
Filip Samuelsson, D. B'egu'e, F. Ryde, A. Pe’er   +3 more
semanticscholar   +1 more source