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Journal-club Galaxies

« Investigating the origin of Galactic cosmic-rays with gamma-ray astronomy »

Fabio Acero
NASA Goddard Space Flight Center (GSFC) (Greenbelt, Maryland, Etats-Unis d'Amérique)

The Fermi Gamma-ray Space Telescope is providing, since 2008, a survey of the whole sky in the 300 MeV-300 GeV energy range with unprecedented sensitivity and angular resolution. Those observations have shed new light on many types of Galactic objects, including Supernova Remnants (SNRs) which are believed to be the sources of Galactic cosmic rays. With over 15 SNRs identified to date and over 40 candidates in the 2nd Fermi Gamma-ray LAT (2FGL) Catalog, we are beginning to have sufficient numbers of objects to perform GeV SNR population studies and explore their connection to TeV emission.
In combination with a wide range of multiwavelength (MW) data, this permits the first systematic study of SNRs including GeV data, allowing us to classify SNRs and to separate effects of evolution and environment. In combination with MW data, we can constrain emission models of the underlying particle populations, allowing us to quantify SNRs' aggregate contribution to Galactic cosmic rays in a statistically significant manner. I will present progress towards this SNR catalog and preliminary results. A particular emphasis will be given to the TeV shell SNRs and the search for GeV counterpart of the recently detected SNR HESS J1731-347.
jeudi 4 avril 2013 - 11:30
Salle 281, Institut d'Astrophysique
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