Speaker
Aya Ishihara
(Chiba University)
Description
Observations of extremely high energy neutrinos are expected to probe the origin of the highest energy cosmic rays with energies up to and above $10^{20}$eV. Cosmogenic neutrinos are associated with the interaction of those most energetic cosmic rays with cosmic microwave background photons (GZK effect) and considered a guaranteed astrophysical neutrino signal. The cosmogenic neutrinos have been searched with the partially completed and completed IceCube detector. The previous cosmogenic neutrino search with approximately 2 years of the complete IceCube data has placed the stringent limit on cosmogenic neutrino models and shown that astrophysical objects with populations following a strong cosmological evolution such as Fanaroff-Riley type II radio galaxies are unlikely the highest energy cosmic-ray sources. We present the updated results of the extremly high energy neutrinos search above ~$10^6$GeV in the total of 6 years of IceCube sample with 3 years of partially completed IceCube data taken in 2008-2011 and 3 years of completed IceCube data in 2011-2014. With expected improvements of more than a factor of two from the previous study, we are able to further constrain or prove the highest energy cosmic-ray origin with the IceCube neutrino observatory.
| Registration number following "ICRC2015-I/" | 0421 |
|---|---|
| Collaboration | IceCube |
Author
Aya Ishihara
(Chiba University)
