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arXiv 1611.04468astro-ph.GA
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$1\lesssim z \lesssim 2$上质量最大的活动星系核

The Most Massive Active Galactic Nuclei at $1\lesssim z \lesssim 2$

Hyunsung D. Jun, Myungshin Im, Dohyeong Kim, Daniel Stern

摘要:

我们在$0.7<z<2.5$获得了26个SDSS类星体的近红外光谱,并使用已报道的静止坐标系紫外$M_{\rm BH} \sim 10^{10}M_{\odot}$来严格检查与它们的质量估计有关的系统效应。我们发现,重于$10^{10}M_{\odot}$的活动星系核通常具有双峰H $α$发射,Mg II附近的极宽Fe II复合物发射,以及高蓝移和加宽的CIV发射。这些证据的重要性,结合以前的研究,警告不要使用基于任何宽度超过8000 km/s的排放线的$M_{\rm BH}$值。此外,$M_{\rm BH}$的估计是不是沿着电离窄线流出,各向异性辐射,或使用线FWHM,而不是$σ$为我们的样本的存在正偏置,和无偏的变异性,分散在宽线等效宽度,或一般的1型类星体的遮蔽。除去系统不确定的$M_{\rm BH}$值,$1\lesssim z \lesssim 2$ AGN中的$\sim10^{10}M_{\odot}$黑洞仍然可以用$\sim10^{9.5}M_{\odot}$黑洞的宽线区域的各向异性运动来解释,尽管目前的观测支持它们本质上是最大质量的,并且质量超过宿主的隆起质量。

英文摘要:

We obtained near-infrared spectra of 26 SDSS quasars at $0.7<z<2.5$ with reported rest-frame ultraviolet $M_{\rm BH} \sim 10^{10}M_{\odot}$ to critically examine the systematic effects involved with their mass estimations. We find that AGNs heavier than $10^{10}M_{\odot}$ often display double-peaked H$α$ emission, extremely broad FeII complex emission around MgII, and highly blueshifted and broadened CIV emission. The weight of this evidence, combined with previous studies, cautions against the use of $M_{\rm BH}$ values based on any emission line with a width over 8000 km/s. Also, the $M_{\rm BH}$ estimations are not positively biased along the presence of ionized narrow line outflows, anisotropic radiation, or the use of line FWHM instead of $σ$ for our sample, and unbiased with variability, scatter in broad line equivalent width, or obscuration for general type-1 quasars. Removing the systematically uncertain $M_{\rm BH}$ values, $\sim10^{10}M_{\odot}$ BHs in $1\lesssim z \lesssim 2$ AGNs can still be explained by anisotropic motion of the broad line region from $\sim10^{9.5}M_{\odot}$ BHs, although current observations support they are intrinsically most massive, and overmassive to the host's bulge mass.

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