A search for neutrinos from active galactic nuclei

Details A search for neutrinos from active galactic nuclei A search for neutrinos from active galactic nuclei

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........94d&link_type=abstract

Thesis (PhD). UNIVERSITY OF MINNESOTA, Source DAI-B 60/08, p. 4030, Feb 2000, 143 pages.

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Several authors have presented astrophysical mechanisms that would lead to measureable sources of high energy neutrinos. These include binary pulsars, early supernova remnants, and active galactic nuclei (AGN). In the case of AGN, a portion of the gravitational energy released by plasma accreting onto a central black hole is converted into non-thermal luminosity which produce high energy protons. Neutrinos (ν) and gamma-rays (γ) are among the particles produced in inelastic collisions of protons with thermal matter or radiation. Measurements of X-ray and γ-ray spectra on board satellite experiments such as EGRET allow authors an opportunity to adjust their theories which are based on the assumption that γ-ray and ν production at the source are related. Neutrinos are not directly measured but instead interact to produce secondary charged muons which can be detected. Deep underground and underwater experiments have been proposed or are in operation to search for high-energy neutrinos from AGN's. Thus far only null results have been reported. In this thesis we present the results of a systematic search for AGN neutrino-induced muon events within the Soudan 2 detector. We also measure the horizontal flux of atmospheric neutrino-induced muons which are the principle background.

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