Results 121 to 130 of about 2,261,840 (225)

Unveiling Nonlinear Patterns between Gamma-Ray Burst Observational Features and Redshift via Machine Learning

The Astrophysical Journal
The study of multifeature cosmological correlations in gamma-ray bursts (GRBs) holds significant importance for establishing them as effective cosmological probes.
Qi Guo
doaj   +1 more source

Gamma-ray-selected AGN

, 2016
The gamma-ray band is the most energetic part of the electromagnetic spectrum. As such it is also where selection effects are most severe, as it can only be reached by the most extreme non-thermal AGN.
Giommi, Paolo, Giommi, Paolo (5268868)
core   +1 more source

TeV Analysis of a Source-rich Region with the HAWC Observatory: Is HESS J1809-193 a Potential Hadronic PeVatron?

The Astrophysical Journal
HESS J1809-193 is an unidentified TeV source, first detected by the High Energy Stereoscopic System (H.E.S.S.) collaboration. The emission originates in a source-rich region that includes several supernova remnants (SNRs) and pulsars including SNR G11.1 ...
A. Albert, R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, R. Babu, E. Belmont-Moreno, A. Bernal, M. Breuhaus, K. S. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova, J. Cotzomi, E. De la Fuente, D. Depaoli, N. Di Lalla, R. Diaz Hernandez, B. L. Dingus, M. A. DuVernois, C. Espinoza, K. L. Fan, K. Fang, B. Fick, N. Fraija, J. A. García-González, F. Garfias, A. Gonzalez Muñoz, M. M. González, J. A. Goodman, S. Groetsch, J. P. Harding, S. Hernández-Cadena, I. Herzog, D. Huang, F. Hueyotl-Zahuantitla, P. Hüntemeyer, A. Iriarte, V. Joshi, S. Kaufmann, A. Lara, J. Lee, H. León Vargas, A. L. Longinotti, G. Luis-Raya, K. Malone, J. Martínez-Castro, J. A. Matthews, P. Miranda-Romagnoli, J. A. Montes, J. A. Morales-Soto, E. Moreno, M. Mostafá, L. Nellen, M. Newbold, M. U. Nisa, R. Noriega-Papaqui, M. Osorio, Y. Pérez Araujo, E. G. Pérez-Pérez, C. D. Rho, D. Rosa-González, E. Ruiz-Velasco, H. Salazar, A. Sandoval, M. Schneider, J. Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, F. Ureña-Mena, E. Varela, X. Wang, I. J. Watson, E. Willox, S. Yun-Cárcamo, H. Zhou, THE HAWC COLLABORATION   +82 more
doaj   +1 more source

Neutrino astronomy and gamma-ray bursts

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2007
The construction of large-volume detectors of high energy, greater than 1 TeV, neutrinos is mainly driven by the search for extragalactic neutrino sources. The existence of such sources is implied by the observations of ultra-high-energy, greater than or equal to 10 19  eV, cosmic rays, the origin of which is a ...
openaire   +3 more sources

A Study on the Line of Sight to Galaxies Detected at Gamma-Ray Energies

The Astrophysical Journal Letters
The large-scale universal structure comprises strands of dark matter and galaxies with large underdense volumes known as voids. We measure the fraction of the line of sight that intersects voids for active galactic nuclei (AGN) detected by Fermi Large ...
Amy Furniss, Josepf N. Amador, Olivier Hervet, Ollie Jackson, David A. Williams   +4 more
doaj   +1 more source

Impacts of Voids, Line-of-sight Interactions, and Local Emission Environment on the Detectability of Gamma-Ray Active Galactic Nuclei

The Astrophysical Journal
Cosmic voids may have novel effects on the propagation of high-energy photons. We consider the fraction of the line of sight that intersect voids (termed “voidiness”).
Ollie Jackson, Amy Furniss, Olivier Hervet, Megan Splettstoesser, David A. Williams   +4 more
doaj   +1 more source

Non-Markovian Cosmic-Ray Pitch-angle Transport from Mirror Interactions

The Astrophysical Journal
Cosmic-ray pitch-angle transport in magnetohydrodynamic (MHD) turbulence is governed by the interplay between magnetic mirroring and gyroresonant scattering. We develop a guiding-center Langevin model with explicit mirror drift and gyroresonant diffusion
Kai Yan, Huirong Yan, Parth Pavaskar, Chuanpeng Hou, Ruo-Yu Liu   +4 more
doaj   +1 more source

Contributions to the technical conference 1743 (SPIE): EUV, X-RAY, and Gamma-ray instrumentation for Astronomy II

, 1992
Contributi: Neutron induced background proportional counters for X-ray astronomy (p.3); Monte Carlo simulation of the materials and filling gas of the imaging counters SXRP (Stellar X-ray Polarimeter) (p.13).
Costa, E., Rapisarda, M., L3 Group, Giagu, S., ENEA, Rome (Italy), Feroci, M.   +5 more
core  

X-ray and gamma ray astronomy detectors [PDF]

, 1994
X-ray and gamma ray astronomy was made possible by the advent of space flight. Discovery and early observations of celestial x-rays and gamma rays, dating back almost 40 years, were first done with high altitude rockets, followed by Earth-orbiting ...
Austin, Robert, Ramsey, Brian D., Decher, Rudolf   +2 more
core  

High-Efficiency Radiation via Fast Electron Beam Pinching in Nonuniform Plasmas. [PDF]

Research (Wash D C)
Zhu XL, Chen M, Sheng ZM.
europepmc   +1 more source