BEIJING, July 3 (Xinhua) -- A joint research team made up of Chinese and Japanese scientists has discovered the highest energy cosmic gamma rays ever observed from an observatory in Tibet, opening a new window to explore the extreme universe. The energy of the gamma rays is as high as 450...
Primary gamma rays with energy of 10 14 –10 16 eV and possible sources of cosmic rays in the galaxyclassical and quantum mechanics, general physicscosmic gamma burstsoriginremote sensingcosmic photonscosmic ray detectioncosmic showersdistance
Search for ultrahigh-energy gamma rays from SN1987A If a newly born neutron star in SN1987A is a powerful injector of ultra high energy (UHE) protons, UHE γ-rays will be emitted by bombardment of supernova ejecta with these UHE particles. We compute energy spectrum of the UHE γ-rays ...
Observation of very high energy Gamma-rays from the Galactic Center with the MAGIC telescope, considering geomagnetic field effects on the imaging technique We have analyzed 3 yr of data on the Vela, Geminga, and Crab pulsars in the energy range 30 MeV to 30 GeV, gathered by the EGRET detec...
Gamma-ray bursts (GRBs) are brief flashes of γ-rays and are considered to be the most energetic explosive phenomena in the Universe1. The emission from GRBs comprises a short (typically tens of seconds) and bright prompt emission, followed by a much longer afterglow phase. During the after...
Extensive air shower data collected using the CASA-MIA detector are examined for evidence of gamma rays above 50 TeV from the directions of 32 active galactic nuclei. Gamma rays above 100 MeV from all of these objects have been detected previously by the Energetic Gamma Ray Experiment Telescope ...
Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment MGRO J2019+37 is the most significant source in Milagro data set apart from the Crab Nebula at 20 TeV. It has not been confirmed by other observations at energy above 100 GeV. The ARGO-YBJ experiment is an...
X-rays and gamma rays, for example, have many clearly ballistic properties not evident in electromagnetic radiation of lower frequencies. Electromagnetic fields The electric and magnetic fields, E and B respectively, associated with a photon are vector quantities oriented such that the unit vectors (...
The death of massive stars has traditionally been discovered by explosive events in the gamma-ray band. Liu et al. show that the sensitive wide-field monitor on board Einstein Probe can reveal a weak soft-X-ray signal much earlier than gamma rays. ...
The Crab pulsar was selected as the first object of detailed study by ESA's gamma-ray astronomy satellite COS B, whose first six years of operations have yielded five 30-40 day duration observations in which the pulsar was within 15 deg of the field of view center. The first of the obse...