Search for Extended Sources in the Galactic Plane Using Six Years of $Fermi$-Large Area Telescope Pass 8 Data above 10 GeV

M. Ackermann M. Ajello L. Baldini J. Ballet 1 G. Barbiellini D. Bastieri R. Bellazzini E. Bissaldi E.D. Bloom R. Bonino E. Bottacini T.J. Brandt J. Bregeon 2 P. Bruel 3 R. Buehler R.A. Cameron M. Caragiulo P.A. Caraveo D. Castro E. Cavazzuti C. Cecchi E. Charles A. Chekhtman C.C. Cheung G. Chiaro S. Ciprini J.M. Cohen D. Costantin F. Costanza S. Cutini F. d'Ammando F. de Palma R. Desiante S.W. Digel N. Di Lalla M. Di Mauro L. Di Venere C. Favuzzi S.J. Fegan 3 E.C. Ferrara A. Franckowiak Y. Fukazawa S. Funk P. Fusco F. Gargano D. Gasparrini N. Giglietto F. Giordano M. Giroletti D. Green I.A. Grenier 1 M.-H. Grondin 4 L. Guillemot 5, 6 S. Guiriec A.K. Harding E. Hays J.W. Hewitt D. Horan 3 X. Hou G. Jóhannesson T. Kamae M. Kuss G. La Mura S. Larsson M. Lemoine-Goumard 4 J. Li F. Longo F. Loparco P. Lubrano J.D. Magill S. Maldera D. Malyshev A. Manfreda M.N. Mazziotta P.F. Michelson W. Mitthumsiri T. Mizuno M.E. Monzani A. Morselli I.V. Moskalenko M. Negro E. Nuss 2 T. Ohsugi N. Omodei M. Orienti E. Orlando J.F. Ormes V.S. Paliya D. Paneque J.S. Perkins M. Persic M. Pesce-Rollins V. Petrosian F. Piron 2 T.A. Porter G. Principe S. Rainò R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer T. Reposeur 4 C. Sgrò D. Simone E.J. Siskind F. Spada G. Spandre P. Spinelli D.J. Suson D. Tak J.B. Thayer D.J. Thompson D.F. Torres G. Tosti E. Troja G. Vianello K.S. Wood M. Wood
Abstract : The spatial extension of a γ-ray source is an essential ingredient to determine its spectral properties, as well as its potential multiwavelength counterpart. The capability to spatially resolve γ-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.
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M. Ackermann, M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, et al.. Search for Extended Sources in the Galactic Plane Using Six Years of $Fermi$-Large Area Telescope Pass 8 Data above 10 GeV. Astrophys.J., 2017, 843 (2), pp.139. ⟨10.3847/1538-4357/aa775a⟩. ⟨hal-01582713⟩

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