Gamma ray astrophysics: the EGRET results
نویسنده
چکیده
Cosmic gamma rays provide insight into some of the most dynamic processes in the Universe. At the dawn of a new generation of gamma-ray telescopes, this review summarizes results from the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory, the principal predecessor mission studying high-energy photons in the 100 MeV energy range. EGRET viewed a gammaray sky dominated by prominent emission from the Milky Way, but featuring an array of other sources, including quasars, pulsars, gamma-ray bursts, and many sources that remain unidentified. A central feature of the EGRET results was the high degree of variability seen in many gamma-ray sources, indicative of the powerful forces at work in objects visible to gamma-ray telescopes. PACS numbers: 95.55.Ka, 95.85.Pw, 98.70.Rz Gamma ray astrophysics: the EGRET results 2
منابع مشابه
Demystifying an unidentified EGRET source by VHE gamma-ray observations
In a novel approach in observational highenergy gamma-ray astronomy, observations carried out by imaging atmospheric Cherenkov telescopes provide necessary templates to pinpoint the nature of intriguing, yet unidentified EGRET gamma-ray sources. Using GeV-photons detected by CGRO EGRET and taking advantage of high spatial resolution images from H.E.S.S. observations, we were able to shed new li...
متن کاملLow-latitude Gamma-ray Sources: Correlations and Variability
A review of the main characteristics of low-latitude sources in the third EGRET catalog is presented. There are 75 unidentified gamma-ray sources detected by EGRET at |b| < 10◦. About a half of these sources are spatially correlated with potential galactic gamma-ray emitters such as supernova remnants, OB associations and early-type stars with very strong stellar winds. The other half is formed...
متن کاملGlast, the Gamma-ray Large Area Space Telescope
The exchange between laboratory physics and astrophysics has demonstrated through centuries of science to be at the origin of fundamental discoveries. GLAST, a detector for cosmic γ rays in the range from 20 MeV to 300 GeV, is built around this idea: both the design of the instrument and the guidelines for science originate from a partnership of researchers from High Energy Physics (HEP) and Hi...
متن کاملLarge-scale anisotropy of EGRET gamma ray sources
Luis Anchordoqui, Thomas McCauley, Thomas Paul, Olaf Reimer, Diego F. Torres (a) Department of Physics, Northeastern University, Boston, MA 02115 USA (b) Institute for Nuclear and Particle Astrophysics, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA (c) W.W.Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305 USA (d) Lawrence Livermore National Laborato...
متن کاملMicroquasars as high-energy gamma-ray sources
Galactic microquasars are certainly one of the most recent additions to the field of high energy astrophysics and have attracted increasing interest over the last decade. However, the high energy part of the spectrum of microquasars is the most poorly known, mainly due the lack of sensitive instrumentation in the past. Microquasars are now primary targets for all of the observatories working in...
متن کامل