Very high energy neutrino expectation from Fanaroff-Riley I sources

Abstract

Fanaroff-Riley I radiogalaxies have been observed in TeV gamma-rays during the last decades. The origin of the emission processes related with this energy band is still under debate. Here we consider the case of the two closest Fanaroff-Riley I objects: Centaurus A and M87. Their entire broadband spectral energy distributions and variability fluxes show evidences that leptonic models are not sufficient to explain their fluxes above 100 GeV. Indeed, both objects have been imaged by LAT instrument aboard of Fermi telescope with measured spectra well connected with one-zone leptonic models. However, to explain the TeV spectra obtained with campaigns by H.E.S.S., for Centaurus A, and by VERITAS, MAGIC and H.E.S.S. for M87, different emission processes must be introduced. In this work we evoke hadronic scenarios to describe the TeV gamma-ray fluxes observed and to obtain the expected neutrino counterparts for each considered TeV campaign. With the obtained neutrino spectra we calculate, through Monte Carlo simulations, the expected neutrino event rate in a hypothetical Km${}^3$ neutrino telescope and we compare the results with what has been observed by IceCube experiment up to now.

6 pages, 2 figures. To appear in the Proceedings of the IAU Symposium No. 313: "Extragalactic jets from every angle," Galapagos, Ecuador, 15-19 September 2014, F. Massaro, C. C. Cheung, E. Lopez, and A. Siemiginowska (Eds.), Cambridge University Press

References in corpus (5)

• Fast variability of TeV gamma-rays from the radio galaxy M 87
• High-energy neutrinos in the context of multimessenger physics
• Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS
• CANGAROO-III Search for Gamma Rays from Centaurus A and the $\omega$ Centauri Region
• Gamma-ray fluxes from the core emission of Centaurus A: A puzzle solved