# Search for extended sources in the Galactic Plane using 6 years of Fermi-Large Area Telescope Pass 8 data above 10 GeV **Authors:** The Fermi LAT Collaboration: M. Ackermann, M. Ajello, L. Baldini, J., Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, E. D. Bloom,, R. Bonino, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, 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, 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,, M.-H. Grondin, L. Guillemot, S. Guiriec, A. K. Harding, E. Hays, J.W. Hewitt,, D. Horan, X. Hou, G. J\'ohannesson, T. Kamae, M. Kuss, G. La Mura, S., Larsson, M. Lemoine-Goumard, 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, 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, T. A. Porter, G. Principe, S. Raino,, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, C., Sgro, 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 arXiv: 1702.00476 · 2018-04-12 ## TL;DR This paper presents the first catalog of extended gamma-ray sources in the Galactic plane above 10 GeV, utilizing 6 years of Fermi-LAT Pass 8 data to identify and characterize 46 such sources. ## Contribution It introduces the Fermi Galactic Extended Source Catalog, the first comprehensive list of extended gamma-ray sources in the Galactic plane at these energies. ## Key findings - Identified 46 extended sources within 7 degrees of the Galactic plane. - Provided detailed morphological and spectral characteristics for each source. - Enhanced detection capabilities due to improved Fermi-LAT Pass 8 data. ## Abstract The spatial extension of a gamma-ray source is an essential ingredient to determine its spectral properties as well as its potential multi-wavelength 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 degrees from the Galactic plane, using 6 years of LAT data above 10 GeV. We find 46 extended sources and provide their morphological and spectral characteristics. This constitutes the first catalog of hard 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. ## Full text _Full body text omitted from this summary view._ Fetch the complete paper as Markdown: https://tomesphere.com/paper/1702.00476/full.md ## Figures 29 figures with captions in the complete paper: https://tomesphere.com/paper/1702.00476/full.md ## References 90 references — full list in the complete paper: https://tomesphere.com/paper/1702.00476/full.md --- Source: https://tomesphere.com/paper/1702.00476