We present the results of a new analysis of data taken in 1998-2002 for a search for high-energy extraterrestrial neutrinos. The analysis is based on a full reconstruction of high-energy cascade parameters: vertex coordinates, energy and arrival direction. Upper limits on the diffuse fluxes of all neutrino flavors, predicted by several models of AGN-like neutrino sources are derived. For an ${ \bf E^{ -2}}$ behavior of the neutrino spectrum, our limit is ${ \bf E^{ 2} F_{ \nu}(E) < 2.9 \times 10^{ -7}}$ cm${ \bf ^{ -2}}$ s${ \bf ^{ -1}}$ sr${ \bf ^{ -1}}$ GeV over a neutrino energy range ${ \bf 2 \times 10^4 \div 2 \times 10^7}$ GeV. This limit is by a factor of 2.8 more stringent than a limit obtained with a previous analysis.
Categories: astro-ph.HE