校准类星体辐射热计的辐射线
Calibrating Emission Lines as Quasar Bolometers
摘要：
历史上，发射谱线被认为是估算活动星系核吸积流（$L_{bol}$）的热光度的有用工具。我们用$0.4<z<0.8$比较了SDSS DR 7射电宁静类星体的谱线强度和光学/紫外连续光谱光度，研究了这种方法的可靠性。我们发现公式为$L_{bol}$作为一个函数的单线强度的广泛组成部分H $β$和镁II，以及窄线的[O III]和[O II]。我们确定拟合到数据的公式的标准误差。我们的新估计被证明是更准确的比档案线强度估计在文献中。它表明，宽线是优越的估计连续光度（和$L_{bol}$）与$Hβ$是最可靠的。每个估计的保真度确定的背景下，SDSS DR 7射电响亮类星体作为一个说明性的应用，我们的结果。一般来说，个别研究人员可以使用我们的结果作为一种工具，以帮助决定是否一个特定的线强度提供了足够的估计$L_{bol}$为他们的目的。最后，它表明，考虑所有四个线强度，同时，可以产生信息的$L_{bol}$和无线电喷流功率。
英文摘要：
Historically, emission lines have been considered a valuable tool for estimating the bolometric thermal luminosity of the accretion flow in AGN, $L_{bol}$. We study the reliability of this method by comparing line strengths to the optical/UV continuum luminosity of SDSS DR7 radio quiet quasars with $0.4<z<0.8$. We find formulae for $L_{bol}$ as a function of single line strengths for the broad components of H$β$ and Mg II, as well as the narrow lines of [O III] and [O II]. We determine the standard errors of the formulae that are fitted to the data. Our new estimators are shown to be more accurate than archival line strength estimations in the literature. It is demonstrated that the broad lines are superior estimators of the continuum luminosity (and $L_{bol}$) with $Hβ$ being the most reliable. The fidelity of the each of the estimators is determined in the context of the SDSS DR7 radio loud quasars as an illustrative application of our results. In general, individual researchers can use our results as a tool to help decide if a particular line strength provides an adequate estimate of $L_{bol}$ for their purposes. Finally, it is shown that considering all four line strength, simultaneously, can yield information on both $L_{bol}$ and the radio jet power.
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