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With assistance of the identified/associated sources in the second FermiLarge Area Telescope (LAT) catalog, we analyze and resolve the spatialdistribution and the distributions of the gamma-ray spectral and variabilityindices of the remaining 575 unassociated Fermi LAT sources. Consequently, itis suggested that the unassociated sources could statistically consist ofGalactic supernova remnants/pulsar wind nebulae, BL Lacertae objects, flatspectrum radio quasars, and other types of active galaxies with fractions of25%, 29%, 41%, and 5%, respectively.

A statistical classification of the unassociated gamma-ray sources in the second Fermi Large Area Telescope Catalog