Sgr A East as a possible high energy neutron factory in the Galactic Centre

TeV neutrinos from supernova remnants embedded in giant molecular clouds

“…CR excesses was also detected by the AGASA [21] and SUGAR [22] experiments in directions close to the Galactic Centre (GC) and in the same energy range. Even if the existence of this anisotropy has not been confirmed by AUGER [23], theoretical arguments suggest that a positive signal may be found when the statistics of that experiment will be improved [24]. Both the Cyg-OB2 star association, laying in the Galactic plane at a distance of 1.7 kpc from the Earth, and the region within 100 pc from the GC, at a distance of about 8.5 kpc, are known to be active star forming regions rich of molecular gas and dust.…”

“…This process was studied in details in [25,26]. Starting from the results presented in those papers, some of us derived the neutron production rate due to the PD of nuclei onto a thermal background of photons at the temperature T [24]. This is…”

“…We will determine the neutron production rate in the nearby of the SNR by applying some of the results derived in a previous work [24]. As secondary neutrons can be produced not only by the PD of high energy nuclei but also by hadronic collisions, mainly p + p gas → n + p + pions, both processes need to be considered.…”

“…The function Φ A (E, T ), which has been defined in [24], depends on the product ET only. It is peaked at the energy…”

Anisotropy studies around the galactic center

“…The predictions of refs. [21], [22] and [23], which exceed the upper-bound obtained by more than one order of magnitude, are already excluded, and that of [24] is at the level of the present Auger sensitivity.…”