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arXiv 1907.04026astro-ph.GAastro-ph.CO
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超大质量黑洞质量的测量:Fe III UV谱线红移与宽发射谱线宽度的相关

Measuring Supermassive Black Hole Masses: Correlation between the Redshifts of the Fe III UV Lines and the Widths of Broad Emission Lines

E. Mediavilla, J. JimÉnez-Vicente, J. MejÍa-Restrepo, V. Motta, E. Falco, J. A. MuÑoz, C. Fian, E. Guerras

摘要:

我们基于Fe III $λλ$ 2039-2113线混合的红移{相对于类星体的静止坐标系}测试了最近提出的(Mediavilla et al. 2018)黑洞质量标度关系。为此,我们在一个非常合适的类星体样本的光谱中拟合了这一特征,该样本是在甚大望远镜(VLT)上用X射线枪观测到的,其质量已经使用维里定理独立估计。对于这个样品的类星体,我们一致确认了Fe III $λλ$ 2039-2113混合物的红移,并发现它与H $β$,H $α$和Mg II的平方宽度相关,这些宽度通常用作$M_{BH}/R$的测量,以根据维里定理确定质量。当分别使用H $β$、H $α$和Mg II线的半高宽(FWHM)时,维里和Fe III $λλ$ 2039-2113红移质量之间的平均差异为0.18 $\pm 0.21$ dex、0.18 $\pm 0.22$ dex和0.14 $\pm 0.21$ dex。当使用Mg II线的标准差PDMATHAMT时,差值减小到0.10 $\pm 0.16$ dex。我们还研究了重子振荡光谱巡天(BOSS)的高S/N复合类星体光谱,发现Fe III $λλ$ 2039-2113的红移和Mg II的平方宽度,$FWHM_{MgII}^2$,非常好地匹配与X-射手观察到的单个类星体光谱的相关性。如果红移是引力引起的,这种相关性是可以预期的。

英文摘要:

We test the recently proposed (Mediavilla et al. 2018) black hole mass scaling relationship based on the redshift {with respect to the quasar's rest frame} of the Fe III$λλ$2039-2113 line blend. To this end, we fit this feature in the spectra of a well suited sample of quasars, observed with X-shooter at the Very Large Telescope (VLT), whose masses have been independently estimated using the virial theorem. For the quasars of this sample we consistently confirm the redshift of the Fe III$λλ$2039-2113 blend and find that it correlates with the squared widths of H$β$, H$α$ and Mg II, which are commonly used as a measure of $M_{BH}/R$ to determine masses from the virial theorem. The average differences between virial and Fe III$λλ$2039-2113 redshift based masses are 0.18$\pm 0.21$ dex, 0.18$\pm 0.22$ dex and 0.14$\pm 0.21$ dex, when the full widths at half maximum (FWHM) of the H$β$, H$α$ and MgII lines are, respectively, used. The difference is reduced to 0.10$\pm 0.16$ dex when the standard deviation, $σ$, of {the} MgII line is used, instead. We also study the high S/N composite quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS), finding that the Fe III$λλ$2039-2113 redshifts and Mg II squared widths, $FWHM_{MgII}^2$, match very well the correlation found for the individual quasar spectra observed with X-shooter. This correlation is expected if the redshift is gravitational.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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