On The Break In The Fermi Lat Spectrum Of 3c 454.3 At Gev Energies

Details On The Break In The Fermi Lat Spectrum Of 3c 454.3 At Gev Energies On The Break In The Fermi Lat Spectrum Of 3c 454.3 At Gev Energies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533605j&link_type=abstract

American Astronomical Society, AAS Meeting #215, #336.05; Bulletin of the American Astronomical Society, Vol. 42, p.440

Astronomy and Astrophysics

Astronomy

Scientific paper

The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope finds a significant break in the published spectrum of the gamma-ray quasar 3C 454.3 at about 3 GeV, with a power-law photon number index of 2.27+-0.03 below the break and 3.5+-0.3 above the break. This large spectral index break excludes simple radiative cooling models. We demonstrate that, given the multi-wavelength spectral energy distribution of the source, the LAT spectrum cannot be described by Compton scattering of a single soft photon source. The observed spectral behavior could be caused by Compton scattering of a combination of two or more target radiation fields, for example, from a combination of accretion disk and scattered broad-line region radiation.

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