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Old 16th January 2016, 03:32 PM   #55
Critical Thinker
Join Date: Apr 2007
Posts: 334
Very high-energy gamma rays

Quote from Teraelectronvolt pulsed emission from the Crab Pulsar detected by MAGIC:
"We investigate the extension of the very high-energy spectral tail of the Crab Pulsar at energies above 400 GeV."

"Using data from the MAGIC telescopes we measured the most energetic pulsed photons from a pulsar to date. Such TeV pulsed photons require a parent population of electrons with a Lorentz factor of at least 5106."

"The MAGIC results require a revision of the state-of-the-art models proposed to explain how and where gamma-ray pulsed emission from 100MeV to 1.5 TeV are produced."
The crab pulsar is not an obscure source such as a remote quasar, but an object at a distance of only around 7000 light years from us. It is the remnant of a supernova explosion around 8000 years ago, which became visible on Earth in the year 1054.

From experience we know that for a high-speed particle, the probability of slowing down is much higher than of further speeding up. How could an electron reach a speed so close to light-speed c that its mass-energy is increased by a factor of 5 million? How is this energy-equivalent of millions of electron-masses transferred to one electron? According to Maxwell and standard physics, the transferred energy itself can only move at c!

The problem of incredibly huge photon energies stems only from the hypothesis that photon-densities always get more and more diluted with time. Under the premise of cohesive forces between gamma photons (post #1) we simply explain such a gamma pulse of 1.5 x 1012 eV by e.g. a flock of 3 x 106 photons with each 5OO keV instead of one single photon with 1.5 TeV.

As the wavelength of a 500 keV photon is only around 2.5 pm = 2.5 x 10-12 m, such a flock consisting of three million individual photons can theoretically be localized in an extremely small region. Insofar as we can neither determine directly wavelength nor frequency of high-energy photons, it is currently impossible to discriminate between one single photon of 1012 eV and a compact group of 105 photons with each 107 eV.

Cheers, Wolfgang

Last edited by wogoga; 16th January 2016 at 03:58 PM.
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