On the Break in the Fermi-Large Area Telescope Spectrum of 3C 454.3

Details On the Break in the Fermi-Large Area Telescope Spectrum of 3C 454.3 On the Break in the Fermi-Large Area Telescope Spectrum of 3C 454.3

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...714l.303f&link_type=abstract

The Astrophysical Journal Letters, Volume 714, Issue 2, pp. L303-L307 (2010).

Astronomy and Astrophysics

Astronomy

21

Gamma Rays: Galaxies, Quasars: Individual: 3C 454.3, Radiation Mechanisms: Non-Thermal

Scientific paper

Fermi Gamma-ray Space Telescope observations of the flat spectrum radio quasar 3C 454.3 show a spectral-index change ΔΓ cong 1.2 ± 0.3 at break energy E br ≈ 2.4 ± 0.3 GeV. Such a sharp break is inconsistent with a cooling electron distribution and is poorly fit with a synchrotron self-Compton model. We show that a combination of two components, namely, the Compton-scattered disk and broad-line region (BLR) radiations, explains this spectral break and gives a good fit to the quasi-simultaneous radio, optical/UV, X-ray, and γ-ray spectral energy distribution observed in 2008 August. A sharp break can be produced independent of the emitting region's distance from the central black hole if the BLR has a gradient in density vpropR -2, consistent with a wind model for the BLR.

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