Speaker
Description
The origin of cosmic ray particles is still largely unknown since they are
deflected on their journey to the Earth by magnetic fields. However, very high
energy (VHE) photons that can be produced by both leptonic and hadronic
processes, are attenuated by extragalactic background light, i.e. they cannot be
probed distances larger than z ∼ 1 at energies above ∼ 1 TeV. In comparison,
only hadronic processes can produce an astrophysical neutrino flux which would
travel unattenuated and undeflected from the source to the Earth. Thus, astro-
physical neutrino observations are crucial to identify CR sources, or to discover
distant VHE accelerators. The KM3NeT detector for Astroparticle Research
with Cosmics in the Abyss (ARCA), with a cubic kilometer instrumented vol-
ume, is currently being built in the Mediterranean Sea. KM3NeT has a view
of the sky complementary to IceCube neutrino detector. It serves an excellent
pointing resolution (< 0.2◦f or > 10 TeV neutrinos) as well as would be sen-
sitive in a large energy range (GeV - PeV), for the upgoing neutrinos. In this
contribution, we present a stacking analysis, that predicts the significance of a
global excess of track-like events in KM3NeT data in correlation with a list of
point-like sources. Different samples of sources are tested in this analysis: Fermi
gamma-ray astrophysical source catalog with a) 1045 BL lac objects and b) 650
radio quasars. We apply a thermal model to study the neutrino production from
the mentioned γ-ray source samples. We try to find a correlation between the
KM3NeT data and the observed Fermi extragalactic sources.
| Session | Astroparticle Physics and Cosmology |
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