The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results

Yue Shen, Catherine J. Grier, Keith Horne, Zachary Stone, Jennifer I. Li, Qian Yang, Yasaman Homayouni, Jonathan R. Trump, Scott F. Anderson, W. N. Brandt, Patrick B. Hall, Luis C. Ho, Linhua Jiang, Patrick Petitjean, Donald P. Schneider, Charling Tao, Fergus. R. Donnan, Yusra AlSayyad, Matthew A. Bershady, Michael R. Blanton, Dmitry Bizyaev, Kevin Bundy, Yuguang Chen, Megan C. Davis, Kyle Dawson, Xiaohui Fan, Jenny E. Greene, Hannes Gröller, Yucheng Guo, Héctor Ibarra-Medel, Yuanzhe Jiang, Ryan P. Keenan, Juna A. Kollmeier, Cassandra Lejoly, Zefeng Li, Axel de la Macorra, Maxwell Moe, Jundan Nie, Graziano Rossi, Paul S. Smith, Wei Leong Tee, Anne-Marie Weijmans, Jiachuan Xu, Minghao Yue, Xu Zhou, Zhimin Zhou and Hu Zou
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Abstract

We present the final data from the Sloan Digital Sky Survey (SDSS) Reverberation Mapping (RM) project, a precursor to the SDSS-V Black Hole Mapper RM program. This data set includes 11 yr photometric and 7 yr spectroscopic light curves for 849 broad-line quasars over a redshift range of 0.1 < z < 4.5 and a luminosity range of Lbol = 1044−47.5 erg s−1, along with spectral and variability measurements. We report 23, 81, 125, and 110 RM lags (relative to optical continuum variability) for broad Hα, Hβ, Mg ii, and C iv using the SDSS-RM sample, spanning much of the luminosity and redshift ranges of the sample. Using 30 low-redshift RM active galactic nuclei with dynamical-modeling black hole masses, we derive a new estimate of the average virial factor of for the line dispersion measured from the rms spectrum. The intrinsic scatter of individual virial factors is 0.31 ± 0.07 dex, indicating a factor of 2 systematic uncertainty in RM black hole masses. Our lag measurements reveal significant R–L relations for Hβ and Mg ii at high redshift, consistent with the latest measurements based on heterogeneous samples. While we are unable to robustly constrain the slope of the R–L relation for C iv given the limited dynamic range in luminosity, we found substantially larger scatter in C iv lags at fixed L1350. Using the SDSS-RM lag sample, we derive improved single-epoch (SE) mass recipes for Hβ, Mg ii, and C iv, which are consistent with their respective RM masses as well as between the SE recipes from two different lines, over the luminosity range probed by our sample. The new Hβ and Mg ii recipes are approximately unbiased estimators at given RM masses, but there are systematic biases in the C iv recipe. The intrinsic scatter of SE masses around RM masses is ∼0.45 dex for Hβ and Mg ii, increasing to ∼0.58 dex for C iv.
斯隆数字巡天反响绘图项目:主要成果
我们展示了斯隆数字巡天(SDSS)混响绘图(RM)项目的最终数据,该项目是SDSS-V黑洞绘图仪RM项目的前身。该数据集包括849个宽线类星体的11年光度光曲线和7年光谱光曲线,红移范围为0.1 < z < 4.5,光度范围为Lbol = 1044-47.5 erg s-1,以及光谱和变率测量数据。我们利用 SDSS-RM 样本报告了宽 Hα、Hβ、Mg ii 和 C iv 的 23、81、125 和 110 RM 滞后(相对于光学连续变率),横跨了样本的大部分光度和红移范围。利用 30 个具有动力学模拟黑洞质量的低红移 RM 活动星系核,我们推导出了从均方根光谱中测得的线色散的平均病毒因子的新估计值。单个病毒因子的内在散度为 0.31 ± 0.07 dex,表明 RM 黑洞质量的系统不确定性为 2 倍。我们的滞后测量揭示了高红移下 Hβ 和 Mg ii 的显著 R-L 关系,这与基于异质样本的最新测量结果一致。由于光度的动态范围有限,我们无法对C iv的R-L关系的斜率进行强有力的约束,但我们发现在固定的L1350下,C iv滞后的散度要大得多。利用SDSS-RM滞后样本,我们得出了改进的Hβ、Mg ii和C iv的单回质量(SE)公式,在我们样本探测的光度范围内,这些公式与它们各自的RM质量以及两条不同谱线的SE公式是一致的。在给定的 RM 质量下,新的 Hβ 和 Mg ii 配方是近似无偏的估计值,但 C iv 配方存在系统性偏差。Hβ和Mg ii的SE质量在RM质量附近的内在散度为∼0.45dex,C iv则增加到∼0.58dex。
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