Dust in the polar region as a major contributor to the IR emission of AGN

摘要: (abridged) It is generally assumed that the distribution of dust on parsec scales forms a geometrically- and optically-thick entity in equatorial plane around accretion disk broad-line region - dubbed "dust torus" emits bulk sub-arcsecond-scale IR emission gives rise to orientation-dependent obscuration. Here we report detailed interferometry observations unobscured (type 1) AGN NGC 3783 allow us constrain size, elongation, direction mid-IR with high accuracy. The characterized by strong elongation toward position angle PA -52 deg, closely aligned polar axis (PA -45 deg). We determine half-light radii along major minor axes at 12.5 {\mu}m (4.23 +/- 0.63) pc x (1.42 0.21) pc, which corresponds intrinsically-scaled sizes (69.4 10.8) rin (23.3 3.5) for inner radius = 0.061 as inferred from near-IR reverberation mapping. This implies an ratio 3:1, about 60-90% 8-13 associated polar-elongated component. These are difficult reconcile standard interpretation most parsec-scale originates torus challenges justification using simple models model broad-band emission. quite likely hot-dust recently resolved misaligned emitting source, also finds correspondence two distinct 3-5 20 bumps seen high-angular resolution spectral energy (SED). conclude these support scenario where majority Seyfert dusty wind AGN.