Galactic sources of high energy neutrinos: Expectation from gamma-ray data

Abstract

The recent results from ground based $\gamma$-ray detectors (HESS, MAGIC, VERITAS) provide a population of TeV galactic $\gamma$-ray sources which are potential sources of High Energy (HE) neutrinos. Since the $\gamma$-rays and $\nu$ -s are produced from decays of neutral and charged pions, the flux of TeV $\gamma$-rays can be used to estimate the upper limit of $\nu$ flux and vice versa; the detectability of $\nu$ flux implies a minimum flux of the accompanying $\gamma$-rays (assuming the internal and the external absorption of $\gamma$-rays is negligible). Using this minimum flux, it is possible to find the sources which can be detected with cubic-kilometer telescopes. I will discuss the possibility to detect HE neutrinos from powerful galactic accelerators, such as Supernova Remnants (SNRs) and Pulsar Wind Nebulae (PWNe) and show that likely only RX J1713.7-3946 , RX J0852.0-4622 and Vela X can be detected by current generation of instruments (IceCube and Km3Net). It will be shown also, that galactic binary systems could be promising sources of HE $\nu$ -s. In particular, $\nu$-s and $\gamma$-rays from Cygnus X-3 will be discussed during recent gamma-ray activity, showing that in the future such kind of activities could produce detectable flux of HE $\nu$-s