Twelve-year update of the MST catalogue of gamma-ray source candidates
  above 10 GeV and at Galactic latitudes higher than 20 degrees
  We present an updated version catalogue of gamma-ray source candidates,
12Y-MST, selected using the minimum spanning tree (MST) algorithm on the
12-year Fermi-LAT sky (Pass 8) at energies higher than 10 GeV. The high-energy
sky at absolute Galactic latitudes above 20 degrees has been investigated using
rather restrictive selection criteria, resulting in a total sample of 1664
photon clusters, or candidate sources. Of these, 230 are new detections, that
is, candidate sources without any association in other gamma-ray catalogues. A
large fraction of them have interesting counterparts, most likely blazars. We
describe the main results on the catalogue selection and search of
counterparts. We also present an additional sample of 224 candidate sources
(12Y-MSTw), which are clusters that we extracted by applying weaker selection
criteria: about 57% of them have not been reported in other catalogues.
