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

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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Cited literature [95 references]

https://hal.archives-ouvertes.fr/hal-01582713
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Submitted on : Wednesday, April 15, 2020 - 1:29:21 PM
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Ackermann_2017_ApJ_843_139.pdf
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### Citation

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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