Ackermann, M.M.AckermannAjello, M.M.AjelloBaldini, L.L.BaldiniCavazzuti, ElisabettaElisabettaCavazzutiCiprini, StefanoStefanoCipriniCutini, SaraSaraCutiniGasparrini, DarioDarioGasparrini2020-09-172020-09-172017-07-01https://hdl.handle.net/20.500.13025/5195The Astrophysical Journal, Volume 843, Issue 2, article id. 139, (2017).The spatial extension of a gamma-ray source is an essential ingredient to determine its spectral properties, as well as its potential multiwavelength counterpart. The capability to spatially resolve gamma-ray sources is greatly improved by the newly delivered Fermi-Large Area Telescope (LAT) Pass 8 event-level analysis, which provides a greater acceptance and an improved point-spread function, two crucial factors for the detection of extended sources. Here, we present a complete search for extended sources located within 7 from the Galactic plane, using 6 yr of Fermi-LAT data above 10 GeV. We find 46 extended sources and provide their morphological and spectral characteristics. This constitutes the first catalog of hard Fermi-LAT extended sources, named the Fermi Galactic Extended Source Catalog, which allows a thorough study of the properties of the Galactic plane in the sub-TeV domain.catalogsgamma rays generaljournal article10.3847/1538-4357/aa775ahttp://adsabs.harvard.edu/abs/2017ApJ...843..139A2017ApJ...843..139A