Volume 576, April 2015
|Number of page(s)||6|
|Published online||30 March 2015|
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|
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 0235−618, 0302−623, and 0308−611 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”.
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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,δ) 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 Emin ≤ Eν ≤ Emax 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
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