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We present the results of a photon cluster search in the 7-years Fermi-LargeArea Telescope extragalactic Pass 8 gamma-ray sky by means of the MinimumSpanning Tree (MST) algorithm, at energies higher than 10 GeV. We found 16clusters of photons, corresponding to candidate gamma-ray sources, located veryclose to infrared-selected sources in the 1WHSP (WISE High Synchrotron Peaked)sample, and therein classified as either "new" or "candidate" blazars. In thispaper some properties of the MST clusters and of the associated sources arepresented.

astrophysics and space science

Application of the MST clustering to the high energy gamma-ray sky. II -  Possible detection of gamma-ray emission from blazar candidates in the 1WHSP  sample