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arXiv 1806.08360astro-ph.GA
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斯隆数字巡天混响测绘计划:来自连续滞后的吸积盘尺寸

The Sloan Digital Sky Survey Reverberation Mapping Project: Accretion-Disk Sizes from Continuum Lags

Y. Homayouni, Jonathan R. Trump, C. J. Grier, Yue Shen, D. A. Starkey, W. N. Brandt, G. Fonseca Alvarez, P. B. Hall, Keith Horne, Karen Kinemuchi, Jennifer I-Hs… 展开作者

Y. Homayouni, Jonathan R. Trump, C. J. Grier, Yue Shen, D. A. Starkey, W. N. Brandt, G. Fonseca Alvarez, P. B. Hall, Keith Horne, Karen Kinemuchi, Jennifer I-Hsiu Li, Ian McGreer, Mouyuan Sun, L. C. Ho, D. P. Schneider

摘要:

我们目前的吸积盘结构测量连续滞后的斯隆数字巡天混响映射(SDSS-RM)项目。使用来自第一年SDSS-RM $g$和$i$测光的\texttt{JAVELIN}软件测量滞后,得到95个类星体的明确滞后,其中33个类星体具有滞后SNR $>$ 2 $σ$。我们还估计滞后使用\texttt{ICCF}软件,并找到一致的结果,虽然有较大的不确定性。吸积盘结构是适合使用马尔可夫链蒙特卡罗方法,参数化作为磁盘大小归一化,波长,黑洞质量和光度的函数测量的连续滞后。与以前的观察结果相比,我们的最佳拟合磁盘大小和颜色配置文件是一致的(在1.5~ $σ$)与\citet{SS73}的分析解决方案。我们还发现,质量越大的类星体有更大的吸积盘,同样符合吸积盘的解析模型。这些数据是不确定的磁盘大小和连续光度之间的相关性,结果是一致的,没有相关性和\citet{SS73}的预期。连续滞后拟合具有较大的过量色散,表明我们测量的滞后误差被低估和/或我们的最佳拟合模型可能遗漏了取向、自旋和/或辐射效率的影响。我们证明,仅使用最高SNR滞后测量值拟合磁盘参数会使最佳拟合磁盘大小的偏差大于使用贝叶斯方法在定义明确的滞后的完整样本上恢复的磁盘大小。

英文摘要:

We present accretion-disk structure measurements from continuum lags in the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Lags are measured using the \texttt{JAVELIN} software from the first-year SDSS-RM $g$ and $i$ photometry, resulting in well-defined lags for 95 quasars, 33 of which have lag SNR $>$ 2$σ$. We also estimate lags using the \texttt{ICCF} software and find consistent results, though with larger uncertainties. Accretion-disk structure is fit using a Markov Chain Monte Carlo approach, parameterizing the measured continuum lags as a function of disk size normalization, wavelength, black hole mass, and luminosity. In contrast with previous observations, our best-fit disk sizes and color profiles are consistent (within 1.5~$σ$) with the \citet{SS73} analytic solution. We also find that more massive quasars have larger accretion disks, similarly consistent with the analytic accretion-disk model. The data are inconclusive on a correlation between disk size and continuum luminosity, with results that are consistent with both no correlation and with the \citet{SS73} expectation. The continuum lag fits have a large excess dispersion, indicating that our measured lag errors are underestimated and/or our best-fit model may be missing the effects of orientation, spin, and/or radiative efficiency. We demonstrate that fitting disk parameters using only the highest-SNR lag measurements biases best-fit disk sizes to be larger than the disk sizes recovered using a Bayesian approach on the full sample of well-defined lags.

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