A MST catalogue of γ-ray source candidates above 10 GeV and at Galactic latitudes higher than 20°^⋆

¹ INAF/OAS-Bologna, via Piero Gobetti 101, 40129 Bologna, Italy
e-mail: campana@iasfbo.inaf.it
² INAF/IAPS, via Fosso del Cavaliere 100, 00133 Roma, Italy
³ In Unam Sapientiam, Piazzale A. Moro 2, 00185 Roma, Italy
⁴ INFN-Sezione di Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
⁵ Dipartimento di Matematica e Fisica, Università Roma Tre, Roma, Italy

Received: 4 May 2018
Accepted: 1 August 2018

Abstract

We describe a catalogue of γ-ray source candidates selected using the minimum spanning tree (MST) algorithm on the nine year Fermi-LAT sky (Pass 8) at energies higher than 10 GeV. The extragalactic sky at absolute Galactic latitudes above 20° has been investigated using rather restrictive selection criteria, resulting in a total sample of 1342 sources. Of these, 249 are new detections that have not been previously associated with γ-ray catalogues. A large portion of these candidates have interesting counterparts, which are most likely blazars. In this paper, we report the main results of the catalogue selection and search of counterparts.