Free Access
Volume 576, April 2015
Article Number L8
Number of page(s) 6
Section Letters
Published online 30 March 2015

Online material

thumbnail Fig. 2

Neutrino flux required to produce one neutrino event in ANTARES as a function of spectral index sν (Eq. (A.3)). The corresponding energy ranges of integration Emin and Emax (Eq. (A.2)) are shown as lower and upper shaded regions respectively: the shading covers the variation due to declination.

Open with DEXTER

thumbnail Fig. 3

Left: ANTARES 90% confidence limits on a flavour-uniform neutrino flux (Φν ≡ Φνe + Φνμ + Φντ = 3Φνμ) from the six blazars as a function of spectral index sν (Eq. (1)). Right: corresponding limits on the expected number of IceCube events of blazar origin, using the exposures shown in Fig. 1 and the limiting fluxes. Since the limits from 0235618, 0302623, and 0308611 are almost identical, and since no events were observed, the limits also apply to the summed flux from all three of these blazars, and hence only one line is shown, and is labelled “IC 20 TANAMI blazars”.

Open with DEXTER

Appendix A: Calculation of neutrino energy flux

For each spectral index sν and source declination δ, the required neutrino flux expected to produce a single ANTARES event can be found from the expression (A.1)where Aeff(Eν) and teff are respectively the ANTARES effective area and the observation time. While the total energy in such a flux is infinite, the energy over the sensitive range of ANTARES can be calculated by defining characteristic energies Emin(δ,sν) and Emax(δ,sν) such that: (A.2)\newpage

with 0.05 below Emin and 0.05 above Emax. The total neutrino energy flux in the range EminEνEmax required to produce one event can then be calculated from as: (A.3)In Fig. 2 is plotted along with Emin and Emax.

© ESO, 2015

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.