arXiv 1702.086092017-02-28astro-ph.GA

活动星系核\oiii扩展分量对\oiii光度与幂律连续光度相关的影响

Effects of extended components of \oiii on the correlation between the \oiii luminosity and the power-law continuum luminosity for active galactic nuclei

XueGuang Zhang, LongLong Feng

备注：: 8 pages, 7 figures, Accepted to be published in MNRAS
DOI：: 10.1093/mnras/stx519

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摘要：

本文利用1982年SDSS类星体大样本的高质量光谱和$z<0.8$，检验了活动星系核的\oiii光度与连续光度（\loiiicon）之间的相关性。发现了\loiiicon的强相关性，与活动星系核的结果相似。此外，在1982个类星体中，有708个类星体的[O~{ \sc iii}] $λ$ 5007 π由两个分量描述：一个核心分量和一个扩展分量。基于核心分量（$L_{\rm [O~\textsc{iii}],~narrow}$）和扩展分量（$L_{\rm [O~\textsc{iii}],~ext}$）的光度，我们证实了$L_{{\rm [O~\textsc{iii}],~ext}}~-~L_{\rm 5100\textscÅ}$的相关性比\oiii总光度和\oiii谱线核心分量光度的相关性更强、更紧密。因此，扩展分量的光度应该更好地应用于活动星系核内禀光度的追踪。同时，我们还发现了核心分量与扩展分量之间的强线宽相关和线光度相关，这表明\oiii线的扩展分量不应该是由普通\oiii线云中通常认为的径向流引起的。中心黑洞引力的维里效应自然导致离中心黑洞较近区域的扩展分量较宽。最后，我们可以说，在第二类窄线活动星系核中，由于扩展成分的完全或部分被遮蔽，所以$L_{{\rm [O~\textsc{iii}],~narrow}}~-~L_{\rm 5100\textscÅ}$对\oiii谱线核心成分的相关性应该更好地估计活动星系核的内禀光度。

英文摘要：

In this manuscript, we check the well-known correlation between \oiii luminosity and continuum luminosity (\loiiicon) for AGN by a large sample of 1982 SDSS QSOs with $z<0.8$ and with high quality spectra. The strong correlation of \loiiicon can be found, similar as previous results for AGN. Moreover, among the 1982 QSOs, there are 708 QSOs with the [O~{\sc iii}]$λ$5007Å described by two components: one core component plus one extended component. Based on the luminosity from the core components ($L_{\rm [O~\textsc{iii}],~narrow}$) and from the extended components ($L_{\rm [O~\textsc{iii}],~ext}$), we confirm that the correlation of $L_{{\rm [O~\textsc{iii}],~ext}}~-~L_{\rm 5100\textscÅ}$ is more stronger and tighter than the correlations on the total \oiii luminosity and on the luminosity of the core components of the \oiii lines. Therefore, the luminosity of the extended components should be better applied to trace AGN intrinsic luminosity. Meanwhile, we have found strong line width correlation and line luminosity correlation between the core components and the extended components, indicating the extended components of the \oiii lines should be not due to commonly considered radial flows in the common \oiii line clouds. And virial effects due to gravity of central black holes naturally lead to the wider extended components from regions more nearer to central black holes. Finally, we can say that the reported correlation of $L_{{\rm [O~\textsc{iii}],~narrow}}~-~L_{\rm 5100\textscÅ}$ on the core components of the \oiii lines should be more better to estimate AGN intrinsic luminosity in Type-2 narrow line AGN, because of totally/partly obscured extended components.

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