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arXiv 1208.3465astro-ph.CO
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外流会影响单历元CIV黑洞质量的估计吗？

Are Outflows Biasing Single-Epoch CIV Black Hole Mass Estimates?

Kelly D. Denney

备注：
16 pages, 10 figures, accepted for publication in the Astrophysical Journal (v2 addresses suggestions of the referee, which includes only minor text modifications compared to v1)
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摘要：

我们使用的混响映射数据和单历元光谱的CIV发射线在一个样本的低和高红移活动星系核（AGN）调查CIV和Hbeta为基础的单历元黑洞质量估计之间的差异的来源。我们发现，对于所有的混响映射源，有一个组成部分的线轮廓，不混响，这个组件的速度特性从对象到对象的变化。这种不可变成分的不同强度和性质是CIV基黑洞质量与β质量相比的大部分散射的原因。由这个不可变分量引入的CIV质量偏差与CIV线的形状相关，使我们能够对黑洞质量估计进行经验校正。使用这种校正并考虑其他散射源，如较差的数据质量和数据不均匀性，将我们样本中CIV和Hbeta质量之间的散射降低了约2倍，仅为约0.2 dex。我们讨论的可能性，这个不可变的CIV组件起源于一个方向相关的流出，无论是建议的宽线区（BLR）盘风或中间线区（ILR），高速内延伸的窄线区（NLR）。

英文摘要：

We use a combination of reverberation mapping data and single-epoch spectra of the CIV emission line in a sample of both low and high-redshift active galactic nuclei (AGNs) to investigate sources of the discrepancies between CIV- and Hbeta-based single-epoch black hole mass estimates. We find that for all reverberation mapped sources, there is a component of the line profile that does not reverberate, and the velocity characteristics of this component vary from object-to-object. The differing strength and properties of this non-variable component are responsible for much of the scatter in CIV-based black hole masses compared to Hbeta masses. The CIV mass bias introduced by this non-variable component is correlated with the shape of the CIV line, allowing us to make an empirical correction to the black hole mass estimates. Using this correction and accounting for other sources of scatter such as poor data quality and data inhomogeneity reduces the scatter between the CIV and Hbeta masses in our sample by a factor of ~2, to only ~0.2 dex. We discuss the possibility that this non-variable CIV component originates in an orientation-dependent outflow from either the proposed broad line region (BLR) disk-wind or the intermediate line region (ILR), a high-velocity inner extension of the narrow line region (NLR).

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