3C 454.3在“平坦”宽线区情景中的光谱能量分布建模
Modeling the spectral-energy-distribution of 3C 454.3 in a "flat" broad-line-region scenario
摘要：
平谱射电类星体（FSRQ）的宽线区（BLR）可能具有“平坦”的几何结构，允许GeV的伽马射线光子逃逸，产生观测到的短时标伽马射线耀斑。本文收集了2007年7月至2011年1月期间FSRQ 3C 454. 3多波长观测获得的准同时谱能量分布（SED），并利用具有“平坦”结构的BLR、吸积盘和尘埃环的模型来解释伽玛射线爆发的SED。结果表明：（i）在爆发过程中，喷流的磁能量密度和粒子能量密度几乎均分;（ii）当发射区位于BLR腔体内时，BLR的覆盖因子$f_{\rm BLR}$很小;随着发射区进入BLR结构，$f_{\rm BLR}$增大. (iii)描述BLR结构的孔径角$α$约为$45^{\circ}$ ;（iv）中心黑洞（BH）质量约为$5\times 10^{8}$ \，$M_{\odot}$而不是$4.4\times 10^{9}$ \，$M_{\odot}$。
英文摘要：
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 the 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 $f_{\rm BLR}$ of the BLR is very small; as the emitting region goes into the BLR structure, $f_{\rm BLR}$ increases. (iii) The aperture angle $α$ describing the BLR structure is about $45^{\circ}$; (iv) The central black hole (BH) mass is about $5\times 10^{8}$\,$M_{\odot}$ rather than $4.4\times 10^{9}$\,$M_{\odot}$.
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