Gamma rays are electromagnetic waves and are part of the electromagnetic spectrum. They occupy a position near one extreme of the spectrum and have very short wavelengths (in the picometer or smaller range) and very high frequencies (in the exahertz (EHz) range or higher).Answer and Explanation...
“If the sudden frequency change is neglected, then after only eight hours, a complete rotation of the pulsar is lost in our counting, and we can no longer determine at which rotational phase the gamma-ray photons reach the detector aboard Fermi,” adds Pletsch. The “flashing” of theneutr...
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in the present embodiment is a count of four hundred. Were this number chosen to be higher, the calibration counting operation would take more time. Hence, by counting down at a frequency of 100 Hertz from a number of four hundred at the end of four seconds the counter will be empty ...
Defined as the square-root of the light curve variance and related to the square-root of the integral of the PSD, see below, over the observable frequency range, i.e., (∫𝑃𝑆𝐷(𝜈)·𝑑𝜈)1/2∫PSD(ν)·dν1/2. 4 For a stationary stochastic process X that results from ...
The nine NLSy1 detected at high significance by Fermi-LAT up to now span a redshift range between 0.061 and 0.787. Luminosity, variability and spectral properties of the NLSy1 in 𝛾γ-rays indicate a blazar-like behaviour (e.g., [6,59]). The average apparent 𝛾γ-ray isotropic ...