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arXiv 0908.2939astro-ph.GAastro-ph.HE
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盘分量对活动星系核单峰宽谱线的贡献

Contribution of a Disk Component to Single Peaked Broad Lines of Active Galactic Nuclei

E. Bon, L. Č. Popović, N. Gavrilović, G. La Mura, E. Mediavilla

摘要:

研究了活动星系核单峰宽发射线中隐藏的盘发射分量。我们比较观察到的宽线从斯隆数字巡天与模拟线轮廓的90塞弗特1光谱的样本。我们考虑了一个两分量的宽线区(BLR)模型,其中一个吸积盘和周围的非盘区域与各向同性的云速度产生模拟的BEL轮廓。该分析主要基于全宽度(在最大强度的10%、20%和30%处)和线轮廓的不对称性的测量。比较模拟和观测的H $α$宽谱线的这些参数,我们发现即使没有双峰谱线的特征,BELs中也可能存在隐藏盘发射。对于现有的样本的对象(塞弗特1星系与单峰贝尔),我们的研究表明,{在单峰宽线轮廓的情况下,隐藏的磁盘发射},磁盘倾角往往是小的(主要是$i<25^\circ$)和磁盘的总流量的贡献应该小于周围地区的贡献。

英文摘要:

We study the disk emission component hidden in the single-peaked Broad Emission Lines (BELs) of Active Galactic Nuclei (AGN). We compare the observed broad lines from a sample of 90 Seyfert 1 spectra taken from the Sloan Digital Sky Survey with simulated line profiles. We consider a two-component Broad Line Region (BLR) model where an accretion disk and a surrounding non-disk region with isotropic cloud velocities generate the simulated BEL profiles. The analysis is mainly based in measurements of the full widths (at 10%, 20% and 30% of the maximum intensity) and of the asymmetries of the line profiles. Comparing these parameters for the simulated and observed H$α$ broad lines, we {found} that the hidden disk emission {may} be present in BELs even if the characteristic {of two peaked line profiles is} absent. For the available sample of objects (Seyfert 1 galaxies with single-peaked BELs), our study indicates that, {in the case of the hidden disk emission in single peaked broad line profiles}, the disk inclination tends to be small (mostly $i<25^\circ$) and that the contribution of the disk emission to the total flux should be smaller than the contribution of the surrounding region.

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