Explore gamma rays. Learn the definition of a gamma ray and see its characteristics. Find the sources of gamma rays on Earth and outer space, and...
Gamma-rays are the highest-energy photons in the ELECTROMAGNETIC SPECTRUM and their detection presents unique challenges. On one hand it is easy to detect γ-rays. The interaction cross-sections are large and above a few MeV the pair production interaction, the dominant γ-ray interaction with ...
Invisible to our eyes, gamma rays fall on an extreme end of the electromagnetic spectrum. They have the shortest wavelengths and the highest frequency of any form of light. Visionaries have been trying to push laser technology into the farthest reaches of the electromagnetic spectrum since the inv...
Keywords: Gamma-ray bursts; non-thermal emission; radiative processes; relativistic astrophysics; very-high energy Gamma-rays1. Introduction on GRBs Gamma-ray bursts (GRBs) are transient sources of radiation associated to extragalactic catastrophic events. Following the accretion of a massive disk onto...
Gamma rays have very short wavelength and quite high frequency of the electromagnetic radiation. Thus, it can penetrate anything except the densest matter. Gamma ray is energetic ionising radiation and thus biologically hazardous. Although gamma rays are electrically neutral, they can ionise atoms ...
Gamma rays have the smallest wavelength and greatest energy of the rays in the electromagnetic spectrum [43]. The basic mechanism underlying the inactivation of viruses through irradiation is thought to be the breakdown of nucleic acids (DNA/RNA) by radiolysis or genetic material cross-linking [44...
1.A photon of electromagnetic radiation of very short wavelength, less than about 0.01 nanometer, and very high energy, greater than about 100,000 electron volts. Gamma rays are emitted in the decay of certain radioactive nuclei and in electron-positron annihilation. ...
Equipartition requires Γ \Gamma as high as 120, unless the emitting region is a small fraction of the dissipation region. Alternatively, we consider γ \gamma rays originating as synchrotron radiation of γ e 1.6 × 10 6 \gamma_{m e}\sim1.6imes10^6 electrons, in magnetic field B 1.3 B...
When the jets are observed at angles of less than a few degrees to the line-of-sight, they are called blazars, showing variable non-thermal emission across the electromagnetic spectrum from radio waves to gamma rays. It is commonly believed that shock waves are responsible for this dissipation...
Mrk 421, Macomb et al., 1995), with the first peak occurring in the IR/optical band in the so-called red blazars (including Flat Spectrum Radio Quasars, FSRQs, and Low-energy peaked BL Lacs, LBLs) and in UV/X-rays in the so-called blue blazars (including High-energy peaked BL ...