论文标题
类星体IR SED中的极性灰尘发射及其与狭窄线区域的相关性
Polar Dust Emission in Quasar IR SEDs and Its Correlation with Narrow Line Regions
论文作者
论文摘要
已经发现极性尘埃在附近的塞弗特核的中红外发射中起重要作用。是否缺乏空间分辨的观测值，是否存在类星体种群中极性灰尘的频率。在这封信中，我们报告了AGN禁止线发射（通常与狭窄线区域相关的）的突出性与原型palomar绿色类星体样品中的灰尘中IR能量输出与从SDSS，Spitzer和Wise Archives中得出的其他明亮的1型AGN之间的相关性。 The AGN mid-IR color differences traced by WISE W2 ($\sim4.6 μm$)$-$W3 ($\sim12 μm$) and W2 ($\sim4.6 μm$)$-$W4 ($\sim22 μm$), and near-IR to mid-IR SEDs constrained with 2MASS, WISE and Spitzer data have clear trends with the relative strength of the forbidden line regions由光学\ OIII和MID-IR \ OIV发射线追踪。这些观察结果表明，在线很强的情况下，在$λ\gtrsim5μ$ m处的AGN发射的很大一部分来自禁止线区域的灰尘。我们发现，广泛引用的通用AGN模板是导致高于圆环输出高的极性灰尘发射的类星体SED的结果，仅典型的紧凑型圆环粉尘发射的典型固有的IR SED就会随着波长的增加而超过5 $μ$ m（以$νf_ν$为单位）。此外，极性灰尘与禁止线的关联表明，随着AGN亮度的增加，红外输出减少的圆环假设的替代方法。
Polar dust has been found to play an important role in the mid-infrared emission of nearby Seyfert nuclei. If and how often polar dust exists among the quasar population is unknown due to the lack of spatially-resolved observations. In this Letter, we report correlations between the prominence of AGN forbidden line emission (commonly associated with the narrow line region) and the dust mid-IR energy output among the archetypal Palomar-Green quasar sample and other bright type-1 AGNs drawn from the SDSS, Spitzer and WISE archives. The AGN mid-IR color differences traced by WISE W2 ($\sim4.6 μm$)$-$W3 ($\sim12 μm$) and W2 ($\sim4.6 μm$)$-$W4 ($\sim22 μm$), and near-IR to mid-IR SEDs constrained with 2MASS, WISE and Spitzer data have clear trends with the relative strength of the forbidden line regions traced by the optical \OIII and mid-IR \OIV emission lines. These observations indicate that, where the lines are strong, a large fraction of the AGN emission at $λ\gtrsim5 μ$m comes from dust in the forbidden line regions. We find that the widely quoted universal AGN template is a result of averaging quasar SEDs with different levels of polar dust emission above the torus output and that the typical intrinsic IR SED of compact torus dust emission alone falls with increasing wavelength past 5 $μ$m (in $νF_ν$). In addition, the association of polar dust with the forbidden lines suggests an alternative to the receding torus hypothesis for the decrease in infrared output with increasing AGN luminosity.
