We present results from high signal-to-noise optical spectropolarimetric observations of the Seyfert 1 galaxies NGC 3783 and Mrk 509 in the 3500–7000 Å range. We find complex structure in the polarized emission for both objects. In particular, Position Angle (PA) changes across the Balmer lines show a distinctive ‘M’-shaped profile that had not been observed in this detail before, but could represent a common trait in Seyfert 1 galaxies. In fact, while this shape is observed in all Balmer lines in NGC 3783, Mrk 509 transitions into a ‘M’-shaped PA profile for higher transitions lines. We have modelled the observed profiles using the STOKES radiative transfer code and assuming that the scattering region is co-spatial with the BLR and outflowing. The results give compelling new evidence for the presence of nuclear winds in these two Seyfert 1 galaxies.

中文翻译：

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NGC 3783 和 Mrk 509 的光谱极化法：Seyfert 1 星系中强大核风的证据

我们展示了 Seyfert 1 星系 NGC 3783 和 Mrk 509 在 3500-7000 Å 范围内的高信噪比光谱偏振观测结果。我们在两个物体的偏振发射中都发现了复杂的结构。特别是，跨巴尔默线的位置角 (PA) 变化显示出独特的“M”形轮廓，这在之前的细节中没有被观察到，但可能代表了 Seyfert 1 星系的共同特征。事实上，虽然在 NGC 3783 的所有 Balmer 线中都观察到了这种形状，但对于更高的过渡线，Mrk 509 转变为“M”形 PA 剖面。我们使用 STOKES 辐射传输代码对观察到的剖面进行了建模，并假设散射区域与 BLR 共空间并流出。