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Extragalactic Positrons: Answer to the 511 keV peak?

Torke Ghashghaee, A. (2013) Extragalactic Positrons: Answer to the 511 keV peak? Bachelor's Thesis, Physics.

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Abstract

The 511 keV peak in the gamma-ray spectrum emitted by the Milky Way is caused by the annihilation of positrons and electrons, especially near the Galactic bulge. The annihilation takes place almost exclusively as a result of the forming of positronium. However, the sources providing the positrons are still subject of debate due in part to discrepancies in the morphology of the 511 keV radiation. In an effort to determine whether an extragalactic object, like another galaxy, could theoretically provide the Milky Way with positrons it is found that this possibility does certainly exist. Even the farthest known galaxy can theoretically function as a source. The biggest obstacle for extragalactic particles making it to the Milky Way is the InterGalactic Medium. This huge space separating galaxies considerably reduces the overall energy of any particle beam passing through it over large enough distances. Nevertheless it does not form an insurmountable hurdle.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 07:53
Last Modified: 15 Feb 2018 07:53
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/11140

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