Wednesday, December 12, 2007

Neutrinos from Cen A?

Cuoco et al. have calculated the expected flux of neutrinos from the Active Galactic Nucleus (AGN) Centaurus A. One can read:

"The field of UHECR physics has probably taken a major step forward with the recent detection by the Pierre Auger Observatory of a spatial correlation between the highest energy cosmic ray events and nearby AGNs [1]. 20 out of 27 events with energies above 60 EeV correlate with a nearby AGN within a radius of 3.1◦. Furthermore, 5 out of the 7 non-correlating events lie along the galactic plane where the AGN catalogues are incomplete and the largest magnetic deflections are expected."

These authors present a puzzle:

"We conclude by commenting on a puzzling aspect of the Auger data: Although many AGNs lie in the direction of the Virgo cluster, no events are detected. Although the statistics is low and this could be an exposure effect it is intriguing to notice that the issue can be settled by observations of the associated neutrino emission in IceCube."

Another possible research topic is to study the Milky Way magnetic field. It could have an "easy path" along the direction of Cent A but not of the Virgo cluster.

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