Search for astrophysical neutrinos from extended and stacked sources with IceCube

The combined data of IceCube's 40-string and 59-string configurations spanning over 700 days are used to search for astrophysical neutrinos originating from sources listed in several catalogs. A stacking method which stacks sources and searches for an integrated signal above the estimated background is employed. Very large scale sources such as neutrino emission from the galactic plane and the Fermi bubble region are also used as extended source hypotheses. To perform these searches, a likelihood method that tests the presence of signal using the shape of such sources, their energy spectra and the angular distribution of events is employed.