Search for cosmic neutrinos with ANTARES

A time integrated search for cosmic neutrinos is discussed in this thesis using four years of data collected by the ANTARES experiment. No statistically significant signal was found, therefore upper limits on the neutrino flux were derived. Limits for specific models of RX J1713.7-3946, Vela X and Crab Nebula which include information on the source morphology and spectrum, are also given.