Universite Bordeaux / CNRS-IN2P3
|Title (1st Abstract)||
New Extended GeV Sources in the Galactic Plane Found in a Search of the Pass 8 data from Fermi-LAT
Centre d'Etudes Nucleaires de Bordeaux-Gradignan, IN2P3/CNRS, Université Bordeaux (France)
Jamie Cohen, Elizabeth Hays, Marianne Lemoine-Goumard on behalf of the Fermi-LAT collaboration
1. Radiation studies from gamma-rays to radio in Galactic and Extragalactic SNRs
Spatially resolving pulsar wind nebulae (PWNe) and supernova remnants (SNRs) at GeV energies enables accurate representation of spectra, aids identification of multiwavelength counterparts, and probes possible substructure within the gamma-ray sources. Using 6 years of Fermi-LAT Pass 8 data above 10 GeV, we searched for spatially extended sources near the Galactic plane. The improved angular resolution and photon acceptance of the Pass 8 event reconstruction significantly aids in characterizing source extension and assessing spectral and morphological properties, a key consideration for studies of PWNe and SNRs in the gamma-ray band. Selecting photons above 10 GeV strikes a balance between keeping photon statistics high and diffuse gamma-ray emission low, and also carries the benefit of a near constancy with energy of the point spread function of the LAT. More than 30 significantly extended sources are detected, many of which are resolved at GeV energies for the first time.