NGC 4151中的尘埃核环：来自Gemini近红外积分场摄谱仪观测的约束
The Dusty Nuclear Torus in NGC 4151: Constraints from Gemini Near-Infrared Integral Field Spectrograph Observations
摘要：
我们利用Gemini近红外积分场谱仪（NIFS）和自适应光学获得的NGC 4151核的近红外核谱（包括Z、J、H和K波段），分离和约束了一个近红外未分辨核源的性质，该核源的光谱特征在我们的数据中清晰地呈现。近红外光谱与空间望远镜成像光谱仪获得的光谱相结合，该光谱用于限制幂律分量的贡献。在减去幂律分量后，近红外连续谱很好地拟合了一个黑体函数，其中$T=1285\pm50 $ K在近红外中占主导地位的核光谱-在半径为0的孔径内$\farcs$ 3。我们将黑体分量归因于尘埃结构的发射，热尘埃质量$M_{\rm HD}=(6.9\pm 1.5) \times10^{-4} {\rm M_\odot}$，我们的观测没有解决，其仅提供其距核的距离的上限为4pc。如果窄线区域的红化也适用于近红外源，我们得到的温度$T=1360\pm50 $ K和质量$M_{\rm HD}=(3.1\pm 0.7) \times10^{-4} {\rm M_\odot}$的热尘埃。这个结构可能是统一模型所假设的尘埃环的内壁，也可能是源自吸积盘的尘埃风的内部。
英文摘要：
We have used a near-infrared nuclear spectrum (covering the Z, J, H and K bands) of the nucleus of NGC 4151 obtained with the Gemini Near-infrared Integral Field Spectrograph (NIFS) and adaptive optics, to isolate and constrain the properties of a near-IR unresolved nuclear source whose spectral signature is clearly present in our data. The near-IR spectrum was combined with an optical spectrum obtained with the Space Telescope Imaging Spectrograph which was used to constrain the contribution of a power-law component. After subtraction of the power-law component, the near-IR continuum is well fitted by a blackbody function, with $T=1285\pm50 $K, which dominates the nuclear spectrum -- within an aperture of radius 0$\farcs$3 -- in the near-IR. We attribute the blackbody component to emission by a dusty structure, with hot dust mass $M_{\rm HD}=(6.9\pm 1.5) \times10^{-4} {\rm M_\odot}$, not resolved by our observations, which provide only an upper limit for its distance from the nucleus of 4 pc. If the reddening derived for the narrow-line region also applies to the near-IR source, we obtain a temperature $T=1360\pm50 $K and a mass $M_{\rm HD}=(3.1\pm 0.7) \times10^{-4} {\rm M_\odot}$ for the hot dust. This structure may be the inner wall of the dusty torus postulated by the Unified Model or the inner part of a dusty wind originating in the accretion disk.
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