Friday, July 26, 2013

1307.6572 (T. J. Brandt et al.)

The 1st Fermi LAT SNR Catalog: the Impact of Interstellar Emission Modeling    [PDF]

T. J. Brandt, J. Ballet, F. de Palma, G. Johannesson, L. Tibaldo, for the Fermi-LAT Collaboration
Galactic interstellar emission contributes substantially to Fermi LAT observations in the Galactic plane, the location of the majority of supernova remnants (SNRs). To explore some systematic effects on SNRs' properties caused by interstellar emission modeling, we have developed a method comparing the official LAT interstellar emission model results to eight alternative models. We created the eight alternative Galactic interstellar models by varying a few input parameters to GALPROP, namely the height of the cosmic ray propagation halo, cosmic ray source distribution in the Galaxy, and atomic hydrogen spin temperature. We have analyzed eight representative SNRs chosen to encompass a range of Galactic locations, extensions, and spectral properties using the eight different interstellar emission models. We will present the results and method in detail and discuss the implications for studies such as the 1st Fermi LAT SNR Catalog.
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