Results 91 to 100 of about 88,325 (210)

Very high energy gamma ray observations of southern hemisphere blazars [PDF]

open access: yes, 1997
This thesis is concerned with very high energy γ-ray observations of blazars observable from the southern hemisphere. The data presented were obtained using the recently deployed University of Durham Mark 6 high sensitivity Čerenkov telescope. Chapters 1
Dickinson, M.R., Dickinson, Mark R.
core  

Modeling the X-Ray Emission of the Boomerang Nebula and Implication for Its Potential Ultrahigh-energy Gamma-Ray Emission

open access: yesThe Astrophysical Journal
The Boomerang Nebula is a bright radio and X-ray pulsar wind nebula (PWN) powered by an energetic pulsar, PSR J2229+6114. It is spatially coincident with one of the brightest ultrahigh-energy (UHE; ≥100 TeV) gamma-ray sources, LHAASO J2226+6057.
Xiao-Bin Chen   +3 more
doaj   +1 more source

An Aerial Gamma Ray Survey of Chapelcross and its Surroundings in February 1992 [PDF]

open access: yes
A short aerial gamma ray survey was conducted in the vicinity of the Chapelcross site from 4th-7th February 1992 to define existing background radiation levels, against which any future changes can be assessed.
Sanderson, D.C.W.   +3 more
core  

Sensitivity of the Cherenkov Telescope Array to the gamma-ray emission from neutrino sources detected by IceCube [PDF]

open access: yes
Gamma-ray observations of the astrophysical neutrino sources are fundamentally important for understanding the underlying neutrino production mechanism. We investigate the Cherenkov Telescope Array (CTA) ability to detect the very-high-energy (VHE) gamma-
Caroff, Sami   +499 more
core   +2 more sources

High-Efficiency Radiation via Fast Electron Beam Pinching in Nonuniform Plasmas

open access: yesResearch
The continuous development of bright x/gamma-ray sources has opened up new frontiers of science and advanced applications. Currently, there is still a lack of efficient approaches to produce high-energy gamma-rays with peak brilliance comparable to ...
Xing-Long Zhu   +2 more
doaj   +1 more source

Ultra high energy gamma ray point sources and cosmic ray anisotropy [PDF]

open access: yes, 1994
The experimental set-up at the Baksan Air Shower Array, used to detect air showers above ~0.2xl0(^14)eV, is described. An estimation of the angular resolution using the cosmic ray shadow of the Sun and the Moon gives a value of ~2.5˚ which is consistent ...
Graham, Lilian Joan, Graham, L.J
core  

Stars, bow shocks, and gamma-ray sources

open access: yes
Aquí presento los resultados de mis investigaciones realizadas en el último par de décadas, focalizados mayoritariamente en los campos de la astrofísica estelar, el medio interestelar y las fuentes de altas energías. Los mismos han sido obtenidos principalmente a partir de observaciones interferométricas dedicadas en la banda de radio a bajas ...
openaire   +3 more sources

A Leptonic Interpretation of the Ultra-high-energy Gamma-Ray Emission from V4641 Sgr

open access: yesThe Astrophysical Journal
Recently, the microquasar V4641 Sgr and its surrounding have been detected at TeV–PeV gamma-ray band. Interestingly, the spectrum follows a power-law function continuing up to 0.8 PeV as reported by LHAASO, and the morphology of the emission appears to ...
Su-Yu Wan, Jie-shuang Wang, Ruo-Yu Liu
doaj   +1 more source

Ultra-high-energy Cosmic-Ray Sources Can Be Gamma-Ray Dim

open access: yesThe Astrophysical Journal Letters
Ultra-high-energy cosmic rays (UHECRs), accelerated hadrons that can exceed energies of 10 ^20 eV, are the highest-energy particles ever observed. While the sources producing UHECRs are still unknown, the Pierre Auger Observatory has detected a large ...
Angelina Sherman   +3 more
doaj   +1 more source

The Gamma-Ray Origin of RX J0852.0-4622 Quantifying the Hadronic and Leptonic Components: Further Evidence for the Cosmic-Ray Acceleration in Young Shell-type SNRs

open access: yesThe Astrophysical Journal
Fukui et al. quantified the hadronic and leptonic gamma-rays in the young TeV gamma-ray shell-type supernova remnant (SNR) RX J1713.7-3946 (RX J1713), and demonstrated that gamma rays are a combination of hadronic and leptonic gamma-ray components with a
Yasuo Fukui   +7 more
doaj   +1 more source

Home - About - Disclaimer - Privacy