Search for high-energy neutrinos from localsuperbubbles with the ANTARES telescope
July 22, 2019
Some peculiarities of our Galactic neighbourhood could be responsible of significant features in the all-sky spectra of cosmic neutrinos, in particular in the tens-of-TeV energy range. The ANTARES neutrino telescope is most sensitive to neutrinos in this energy range and can test possible emissions over large parts of the sky.
Stellar winds and Supernovae can create regions of low matter density; the cumulative effect of many, close-by, active stars is the formation of “bubbles” with a rather low-density environment and “walls” at their borders where matter density and magnetic fields are enhanced. The Loop1 structure dominates the sky at radio wavelengths and is allegedly produced by the interaction of the Local Bubble, where our Solar System resides, and the bubble inflated by stellar activity in the Cen-Sco association, a group of large active stars close to us. Some models predict an increased cosmic ray interaction rate at the surface of contact between the two bubbles, which could be contributing to the overall cosmic neutrino signal.
A search for neutrinos from the Loop1 region has been carried out using data collected by the ANTARES neutrino telescope over 11 years of data acquisition. Track-like upward-going events are considered, the event selection being optimised to achieve the best sensitivity to a large-scale emission of neutrinos. The results of this analysis are presented in this contribution. A non-significant excess of events is observed from the signal region when compared to the estimated background.
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