Modeling the spectral energy distribution of 3C 454.3 in a "flat" broad-line region scenario
Nippon Tenmon Gakkai obun kenkyu hokoku
The broad-line region (BLR) of flat-spectrum radio quasars (FSRQs) could have a "flat" geometrical structure to allow GeV gamma-ray photons escape, to produce the observed gamma-ray flares with short timescales. In this paper, we collect the quasi-simultaneous spectral energy distributions (SEDs) of the FSRQ 3C 454.3 obtained by the multi-wavelength campaigns spanning from 2007 July to 2011 January, and use a model with the "flat" structure BLR, the accretion disc and the dust torus to explain
... he SEDs of gamma-ray outbursts. We obtain the following results: (i) The jet is almost in equipartition between magnetic and particle energy densities during the outbursts; (ii) When the emitting region locates inside the cavity of the BLR, the covering factor f_ BLR of the BLR is very small; as the emitting region goes into the BLR structure, f_ BLR increases. (iii) The aperture angle α describing the BLR structure is about 45^∘; (iv) The central black hole (BH) mass is about 5× 10^8 M_ rather than 4.4× 10^9 M_.