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| Title: |
| Photohadronic origin of the TeV-PeV neutrinos observed in IceCube |
| Authors: |
| Winter, Walter |
| Affiliation: |
| AA(Institut für theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany) |
| Publication: |
| Physical Review D, vol. 88, Issue 8, id. 083007 (PhRvD Homepage) |
| Publication Date: |
| 10/2013 |
| Origin: |
| APS |
| PACS Keywords: |
| Neutrino muon pion and other elementary particles, cosmic rays, Cosmic rays |
| DOI: |
| 10.1103/PhysRevD.88.083007 |
| Bibliographic Code: |
| 2013PhRvD..88h3007W |
Abstract
We perform an unbiased search of the origin of the recently observed 28
events above ˜30TeV in the IceCube neutrino observatory, assuming
that these are (apart from the atmospheric background) of astrophysical
origin produced by
photohadronic interactions. Instead of relying on the
normalization of the neutrino flux, we demonstrate that spectral shape
and flavor composition can be used to constrain or identify the source
class. In order to quantify our observations, we use a model where the
target photons are produced by the synchrotron emission of
coaccelerated
electrons, and we include magnetic field effects on the secondary muons,
pions, and
kaons. We find that the lack of observed events with energies
much larger than PeV points towards sources with strong magnetic fields,
which do not exhibit a direct correlation between
highest cosmic ray and
neutrino energies. While the simplest active galactic nuclei models with
efficient proton acceleration plausibly describe the current data at
about the 3σ confidence level, we show that IceCube can rule out
that the observed neutrinos stem from the sources of the
ultrahigh-energy cosmic rays with a factor of 10 increased statistics
at
more than 5σ if the current observations are confirmed. A possible
caveat are sources with strong magnetic fields and high Lorentz factors,
such as magnetic energy dominated gamma-ray bursts.
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