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arXiv 1405.5014astro-ph.GA
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四重成像类星体HE0435-1223中宽线区的微透镜效应

Microlensing of the broad-line region in the quadruply imaged quasar HE0435-1223

L. Braibant, D. Hutsemékers, D. Sluse, T. Anguita, C. J. García-Vergara

摘要:

使用ESO甚大望远镜的光谱仪SINFONI在2009年获得的z = 1.693的四透镜类星体HE 0435 -1223的红外光谱,我们在图像A和D中检测到了清晰的微透镜效应。虽然微透镜对图像D中Hα线轮廓的蓝色和红色翅膀的影响非常不同,但它缩小了图像A中的线核心。这些不同效应的组合对线发射区域设置了限制;这些限制表明旋转环位于Hα线的原点。在2004年和2012年获得的可见光谱表明,MgII线轮廓以与Hα线相同的方式被微透镜化。因此,我们的研究结果有利于扁平的几何形状的低电离线发射区域,例如,开普勒磁盘。不能排除双锥模型,但需要更多的微调。不同的图像之间的通量比也来自和确认通量异常相对于平滑的质量分布的透镜模型的估计。

英文摘要:

Using infrared spectra of the z = 1.693 quadruply lensed quasar HE0435-1223 acquired in 2009 with the spectrograph SINFONI at the ESO Very Large Telescope, we have detected a clear microlensing effect in images A and D. While microlensing affects the blue and red wings of the Hα line profile in image D very differently, it de-magnifies the line core in image A. The combination of these different effects sets constraints on the line-emitting region; these constraints suggest that a rotating ring is at the origin of the Hα line. Visible spectra obtained in 2004 and 2012 indicate that the MgII line profile is microlensed in the same way as the Hα line. Our results therefore favour flattened geometries for the low-ionization line-emitting region, for example, a Keplerian disk. Biconical models cannot be ruled out but require more fine-tuning. Flux ratios between the different images are also derived and confirm flux anomalies with respect to estimates from lens models with smooth mass distributions.

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