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arXiv 2302.05261astro-ph.GA
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LSST时代下通过连续谱反响映射估计活动星系核黑洞质量

Estimating AGN Black Hole Masses via Continuum Reverberation Mapping in the Era of LSST

Shu Wang, Hengxiao Guo, Jong-Hak Woo

AI总结:

本文提出一种基于连续谱反响映射的黑洞质量估计新方法,利用21个AGN样本发现R_BLR与R_CER之间存在紧密关系,并验证该方法在LSST时代具有广泛应用前景。

摘要:

光谱反响映射(RM)是一种广泛用于估计活动星系核(AGNs)中黑洞(BHs)质量的直接方法。然而,该方法非常耗时,且难以应用于大型AGN样本。宽线区尺寸与光度之间的经验关系(Hβ R_BLR–L)提供了一种实用的替代方案,但仍存在较大弥散和系统偏差。基于Netzer(2022)报道的连续谱发射区尺寸与光度之间的关系(R_CER–L),我们通过比较R_CER和R_BLR,假设连续谱延迟主要由弥散连续谱发射主导,提出了一种新的基于连续谱反响映射(CRM)的黑洞质量估计方法。利用一个包含21个AGNs的样本,我们发现R_BLR–R_CER之间存在紧密关系(弥散约0.28 dex),并且R_BLR在5100 Å处平均比R_CER大8.1倍。这种紧密关系使得基于CRM并结合速度信息来估计黑洞质量成为可能。将该关系应用于我们CRM样本中的静止对象,我们证明预测的R_BLR,CRM很好地遵循现有的Hβ R_BLR–L关系,并且估计的CRM黑洞质量与使用Hβ的RM/单历元黑洞质量一致。由于连续谱延迟较短以及易于获取的高节奏、大面积测光数据,该方法将为黑洞质量估计提供重要应用,尤其是在Legacy Survey of Space and Time时代。

英文摘要:

Spectroscopic reverberation mapping (RM) is a direct approach widely used to estimate the mass of black holes (BHs) in active galactic nuclei (AGNs). However, it is very time consuming and difficult to apply to a large AGN sample. The empirical relation between the broad-line region size and luminosity (H$β$ $R_{\rm BLR}\unicode{x2013}L$) provides a practical alternative yet is subject to large scatter and systematic bias. Based on the relation between the continuum emitting region size and luminosity ($R_{\rm CER}\unicode{x2013}L$) reported by Netzer (2022), we present a new BH mass estimator via continuum RM (CRM) by comparing $R_{\rm CER}$ and $R_{\rm BLR}$, assuming that the continuum lags are dominated by the diffuse continuum emission. Using a sample of 21 AGNs, we find a tight $R_{\rm BLR}\unicode{x2013}R_{\rm CER}$ relation (scatter$\sim$0.28 dex) and that $R_{\rm BLR}$ is larger than $R_{\rm CER}$ at 5100 Å by an average factor of 8.1. This tight relation enables the BH mass estimation based on the CRM combined with the velocity information. Applying the relation to rest objects in our CRM sample, we demonstrate that the predicted $R_{\rm BLR,CRM}$ follows the existing H$β$ $R_{\rm BLR}\unicode{x2013}L$ relation well and the estimated CRM BH masses are consistent with the RM/single-epoch BH masses using H$β$. This method will provide significant applications for BH mass estimation thanks to the short continuum lags and the easily accessible high-cadence, large-area photometric data, especially in the era of Legacy Survey of Space and Time.

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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