DATA MINING IN GAMMA ASTROPHYSICS EXPERIMENTS

Abstract

Data mining techniques, including clustering and classification tasks, for the automatic information extraction from large datasets are increasingly demanded in several scientific fields. Inparticular, in the astrophysical field, large archives and digital sky surveys with dimensions of 10¹² bytes currently exist, while in the near future they will reach sizes of the order of 10¹⁵. In this work we propose a multidimensional indexing method to effciently query and mine large astrophysical datasets. A novelty detection algorithm, based on the Support Vector Clustering and using density and neighborhood information storedin the index structure, is proposed to find regions of interest in data characterized by isotropic noise. We show an application of this method for the detection of point sources from a gamma-ray photon list.