Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-31
Astropart.Phys.25:140-150,2006
Astronomy and Astrophysics
Astrophysics
19 pages, 23 figures, submitted to Astroparticle Physics
Scientific paper
10.1016/j.astropartphys.2005.12.
We present the results of a search for high energy extraterrestrial neutrinos with the Baikal underwater Cherenkov detector NT200, based on data taken in 1998 - 2002. Upper limits on the diffuse fluxes of $\nu_e+\nu_{\mu}+\nu_{\tau}$, predicted by several models of AGN-like neutrino sources, are derived. For an $E^{-2}$ behavior of the neutrino spectrum, our limit is $E^2 \Phi_{\nu}(E)<8.1 10^{-7} cm^{-2} s^{-1} sr^{-1} GeV$ over an neutrino energy range $2 10^4 - 5 10^7 GeV$. The upper limit on the resonant $\bar{\nu}_e$ diffuse flux is $\Phi_{\bar{\nu}_e}< 3.3 10^{-20} cm^{-2} s^{-1} sr^{-1} GeV^{-1}$.
Aynutdinov V.
for the BAIKAL Collaboration
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