Results 121 to 130 of about 74,658 (229)

Explaining the Origin of TeV Gamma Rays from M87 during High and Low States

The Astrophysical Journal
The detection of very-high-energy gamma rays from M87 can provide crucial insights into particle acceleration and radiation mechanisms in jets. The recent observations by the Large High Altitude Air Shower Observatory detector extend the energy range of ...
Nibedita Mondal, Sandeep Kumar Mondal, Nayantara Gupta   +2 more
doaj   +1 more source

High energy gamma ray astronomy [PDF]

High energy gamma ray astronomy has evolved with the space age. Nonexistent twenty-five years ago, there is now a general sketch of the gamma ray sky which should develop into a detailed picture with the results expected to be forthcoming over the next ...
Fichtel, Carl E.
core   +1 more source

\gamma-rays from starburst galaxies

, 2012
In this paper the current status of \gamma-ray observations of starburst galaxies from hundreds of MeV up to TeV energies with space-based instruments and ground-based Imaging Atmospheric Cherenkov Telescopes (IACTs) is summarised.
Ohm, Stefan
core   +1 more source

Gamma-Ray Astronomy

, 2008
In this paper, I present a summary of the status of γ-ray astronomy in the very high energy band (E > 50GeV), as of early 2007. It covers a selection of results obtained from observations made by ground-based detectors using the atmospheric Cherenkov or air shower techniques, together with short descriptions of some of the present and future ...
openaire   +2 more sources

X- and Gamma-ray Studies of Cas A: Exposing Core Collapse to the Core

, 2003
In this review of X-ray and gamma-ray observations of Cas A, evidence is discussed that Cas A was a Type Ib supernova of a Wolf-Rayet star with a main sequence mass between 22-25 Msun, that exploded after stellar wind loss had reduced its mass to ~6 Msun.
Arnett, Ashworth, Chan, Chevalier, Delaney, Diehl, Fesen, Fesen, Fesen, Garcia-Segura, Gotthelf, Hamuy, Hashimoto, Heger, Hughes, Hwang, Iyudin, Jacco Vink, Jean, Kamper, Kifonidis, Laming, Lawrence, Markert, Massey, Meynet, Milne, Milne, Mochizuki, Mochizuki, Nagataki, Park, Rasmussen, Reed, Ruiz-Lapuente, Ryle, Stephenson, Tananbaum, Thorstensen, Vink, Vink, Vink, Vink, Willingale, Willingale, Woosley, Woosley   +46 more
core   +1 more source

The ARGO-YBJ legacy to next generation wide field-of-view experiments

EPJ Web of Conferences, 2017
The ARGO-YBJ experiment has been in stable data taking for more than 5 years at the YangBaJing Cosmic Ray Observatory (Tibet, P.R. China, 4300 m a.s.l., 606 g/cm2).
Di Sciascio Giuseppe
doaj   +1 more source

Study of Silicon Photomultipliers for the GRIPS Calorimeter Module

Acta Polytechnica, 2013
GRIPS is a proposed gamma-ray (200 keV to 80 MeV) astronomy mission, which incorporates a pair-creation and Compton scattering telescope, along with X-ray and infrared telescopes.
Alexei Ulyanov, Lorraine Hanlon, Sheila McBreen, Suzanne Foley   +3 more
doaj  

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

Gamma Ray Astronomy with Magnetized Zevatrons

, 2005
Nearby sources of cosmic rays up to a ZeV(=10^21 eV) could be observed with a multi-messenger approach including secondary gamma-rays and neutrinos. If cosmic rays above ~10^18 eV are produced in magnetized environments such as galaxy clusters, the flux ...
Armengaud, Eric, Miniati, Francesco, Sigl, Guenter   +2 more
core   +1 more source

Experimental Gamma-Ray Astronomy

Journal of Physics: Conference Series, 2012
Our knowledge of the γ-ray sky has dramatically changed due to the advent of the new ground-based Imaging Atmospheric Cherenkov Telescopes (H.E.S.S., MAGIC and VEPJTAS) and the satellite-borne instruments (AGILE and Fermi). These facilities boosted the number of γ-ray sources by one order of magnitude in the last 6 years, providing us with about 2000 ...
openaire   +1 more source