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Massive Neutrinos and Ultraviolet Astronomy

Published online by Cambridge University Press:  04 August 2017

D. W. Sciama
D. W. Sciama*
Affiliation:
International School for Advanced Studies, Trieste and Department of Astrophysics, Oxford University

Abstract

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Massive neutrinos (or photinos) dominating galactic halos may decay into less massive particles by emitting ultraviolet photons. The lifetime for this process can be calculated from particle physics in a model-dependent way. The observed ultraviolet background constrains this lifetime to exceed about 1024 seconds. If the photon energy exceeds 13.6 ev, the existence of HI structures from the galactic plane imposes a similar constraint. The existence of Si IV and C IV in the halos of our own and other galaxies could be due to ∼ 50 ev photons emitted by neutrinos or photinos of rest-mass ∼ 100 ev if their lifetime ∼ 1027 seconds. This lifetime could be in agreement with the theoretical value for 100 ev particles.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 104: Early Evolution of the Universe and Its Present Structure , 1983 , pp. 313 - 320
Copyright
Copyright © Reidel 1983 

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