KM3NeT/ARCA Expectations for the Low Latitude Bubbles
July 31, 2019
In 2010 it was pointed out that the Fermi-LAT telescope registered high-energy gamma-ray emission from giant outflows symmetric respect to the Galactic plane which exceeded the expected backgrounds. The region were this emission was observed, extending up to 9 kpc from the Galactic plane and covering a total solid angle of ~1 sr, was afterward called: Fermi Bubbles. This observation could be interpreted as the trace of an outburst activity of the central supermassive black hole and the collected gamma rays were attributed to the non-thermal emission from cosmic rays accelerated in this region. Since this gamma-ray observations several hypotheses were made about the leptonic or hadronic origin of this emission. In 2016 a new analysis by the HAWC collaboration provided stringent upper limits on the gamma-ray flux from the Northern Fermi Bubble in the energy range of teens of TeV. These limits represent a constrain also for a possible neutrino counterpart making more difficult the observation through high-energy neutrino telescopes. However, in 2017, a study of the Fermi-LAT collaboration focused on the Fermi Bubbles region below 10 degrees of latitude produced the observation of a different spectral behaviour. The resulting spectral energy distribution is harder than the one obtained from the whole Fermi Bubbles. This allows for better observational possibilities for neutrino telescopes. Here we show the expectations for KM3NeT/ARCA.
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