NGC3783和MR2251-178的光学和近红外长期监测：薄吸积盘可变近红外发射的证据
Optical and Near-IR long-term monitoring of NGC3783 and MR2251-178: evidence for variable near-IR emission from thin accretion discs
摘要：
我们给出了两个活动星系核（NGC 3783和MR 2251 -178）的长期近红外光变曲线。近红外数据与在同一时间段内获得的光学光度测量进行了补充。在所有波段的光变曲线是高度可变的，可以看到良好的相关性之间的光学和近红外变化。NGC 3783的交叉相关分析表明，一些光盘近红外辐射是存在于J波段通量，而H和K波段的主要是从位于尘埃升华半径的环面发射。对于MR 2251 -178，互相关分析和光学近红外通量-通量图表明，近红外通量由盘发射主导。我们模拟的光学近红外光谱能量分布（SED）的两个来源，并发现光盘耀斑可能是一个必要的修改薄光盘的几何形状，以解释的意见。MR 2251 -178的SED给出了环面存在NIR发射的一些指示。最后，我们考虑的影响，标准的α盘模型来解释不同的起源变量近红外发射在这些活动星系核。
英文摘要：
We present long term near-IR light curves for two nearby AGN: NGC3783 and MR2251-178. The near-IR data are complemented with optical photometry obtained over the same period of time. The light curves in all bands are highly variable and good correlations can be seen between optical and NIR variations. Cross-correlation analysis for NGC 3783 suggests that some disc near-IR emission is present in the J-band flux, while the H and K-bands are dominated by emission from a torus located at the dust sublimation radius. For MR2251-178 the cross-correlation analysis and the optical-near-IR flux-flux plots suggest that the near-IR flux is dominated by disc emission. We model the optical to near-IR Spectral Energy Distributions (SED) of both sources and find that disc flaring might be a necessary modification to the geometry of a thin disc in order to explain the observations. The SED of MR2251-178 gives some indications for the presence of NIR emission from a torus. Finally, we consider the implications of the standard alpha disc model to explain the different origin of the variable NIR emission in these AGN.
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