M. AckermannM. AjelloW. B. AtwoodL. BaldiniJ. BalletG. BarbielliniD. BastieriJ. Becerra GonzalezR. BellazziniE. BissaldiR. D. BlandfordE. D. BloomR. BoninoE. BottaciniT. J. BrandtJ. BregeonP. BruelR. BuehlerS. BusonG. A. CaliandroR. A. CameronR. CaputoM. CaragiuloP. A. CaraveoE. CavazzutiC. CecchiE. CharlesA. ChekhtmanC. C. CheungJ. ChiangG. ChiaroS. CipriniJ. M. CohenJ. Cohen-TanugiL. R. CominskyJ. ConradA. CuocoS. CutiniF. D'AmmandoA. De AngelisF. De PalmaR. DesianteM. Di MauroL. Di VenereA. DomínguezP. S. DrellC. FavuzziS. J. FeganE. C. FerraraW. B. FockeP. FortinA. FranckowiakY. FukazawaS. FunkA. K. FurnissP. FuscoF. GarganoD. GasparriniN. GigliettoP. GiommiF. GiordanoM. GirolettiT. GlanzmanG. GodfreyI. A. GrenierM. H. GrondinL. GuillemotS. GuiriecA. K. HardingE. HaysJ. W. HewittA. B. HillD. HoranDeutsche Elektronen-SynchrotronClemson UniversitySanta Cruz Institute for Particle PhysicsIstituto Nazionale Di Fisica Nucleare, Sezione di PisaKavli Institute for Particle Astrophysics and CosmologyInstitut de Recherche sur les Lois Fondamentales de l'UniversIstituto Nazionale di Fisica Nucleare, RomaUniversita degli Studi di TriesteIstituto Nazionale Di Fisica Nucleare, Sezione di PadovaUniversità degli Studi di PadovaNASA Goddard Space Flight CenterUniversity of MarylandUniversità degli Studi di TorinoLaboratoire Univers et Particules de MontpellierLaboratoire Leprince-RinguetUniversity of Maryland, Baltimore CountyConsorzio Interuniversitario per la Fisica Spaziale (CIFS)Università degli Studi di BariINAF Istituto di Astrofisica Spaziale e Fisica Cosmica, MilanAgenzia Spaziale ItalianaUniversita degli Studi di PerugiaGeorge Mason University, Fairfax CampusNaval Research LaboratorySonoma State UniversityStockholms universitetOskar Klein Centre for Cosmoparticle PhysicsOsservatorio Astronomico di RomaIstituto Di Radioastronomia, BolognaAlma Mater Studiorum Università di BolognaUniversità degli Studi di Napoli Federico IIUniversita degli Studi di UdineHarvard-Smithsonian Center for AstrophysicsHiroshima UniversityErlangen Centre for Astroparticle PhysicsIN2P3 Institut National de Physique Nucleaire et de Physique des ParticulesUniversite d'OrleansInstitut National des Sciences de l'UniversUniversity of North FloridaUniversity of SouthamptonOsservatorio Astronomico di TriesteUniversity Science Institute ReykjavikUniversity of TokyoWaseda UniversityCNRS Centre National de la Recherche ScientifiqueUniversite de ToulouseMedizinische Universitat InnsbruckThe Royal Institute of Technology (KTH)Universitat Autònoma de Barcelona2018-12-112019-03-142018-12-112019-03-142016-01-01Astrophysical Journal, Supplement Series. Vol.222, No.1 (2016)006700492-s2.0-84955482407https://repository.li.mahidol.ac.th/handle/20.500.14594/43594© 2016. The American Astronomical Society. All rights reserved. We present a catalog of sources detected above 50 GeV by the Fermi-Large Area Telescope (LAT) in 80 months of data. The newly delivered Pass 8 event-level analysis allows the detection and characterization of sources in the 50 GeV-2 TeV energy range. In this energy band, Fermi-LAT has detected 360 sources, which constitute the second catalog of hard Fermi-LAT sources (2FHL). The improved angular resolution enables the precise localization of point sources (∼1.′7 radius at 68% C. L.) and the detection and characterization of spatially extended sources. We find that 86% of the sources can be associated with counterparts at other wavelengths, of which the majority (75%) are active galactic nuclei and the rest (11%) are Galactic sources. Only 25% of the 2FHL sources have been previously detected by Cherenkov telescopes, implying that the 2FHL provides a reservoir of candidates to be followed up at very high energies. This work closes the energy gap between the observations performed at GeV energies by Fermi-LAT on orbit and the observations performed at higher energies by Cherenkov telescopes from the ground.Mahidol UniversityEarth and Planetary SciencesArticleSCOPUS10.3847/0067-0049/222/1/5