Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.2002c&link_type=abstract
American Astronomical Society, HEAD meeting #11, #20.02; Bulletin of the American Astronomical Society, Vol. 41, p.690
Astronomy and Astrophysics
Astronomy
Scientific paper
The Large Area Telescope (LAT), one of two instruments on the Fermi Gamma-Ray Space Telescope, detects gamma-rays in the energy range of 20 MeV to 300 GeV and has been in routine operation for more than one year. Active galactic nuclei, pulsars, micro-quasars, and supernova remnants, for example, have been identified as sources of some of the LAT photons and have led to exciting new insights into the emission mechanisms of those objects. However, most of the photons detected by the LAT at GeV energies originate from the interstellar processes in the Galaxy. This high-energy gamma-ray emission comes from the interaction of cosmic-ray electrons and protons with the interstellar medium and radiation field. The LAT, with its large effective area and field of view as well as its survey-mode observation strategy and stable response, is particularly well suited for studying this emission and for providing informations on the cosmic rays and the distribution of gas and radiation in the Milky Way.
We provide an overview of the studies performed by the Fermi collaboration on the Galactic diffuse gamma-ray emission. It includes measurement of the gamma-ray emissivity spectrum of local gas, study of the gradient of cosmic-ray densities and N(H2) to W(CO) ratio and emission from local structures.
Casandjian Jean-Marc
Fermi Large Area Telescope Collaboration
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