论文标题
Beagle-agn I：同时对星系中气体和AGN狭窄区域中气体特性的约束
BEAGLE-AGN I: Simultaneous constraints on the properties of gas in star-forming and AGN narrow-line regions in galaxies
论文作者
论文摘要
我们介绍了从窄线区域（NLR）添加了围绕活性银河核（AGN）的Nebular发射到Beagle（银河系的贝叶斯分析）。使用一组理想化的光谱，我们适合一组可观察的光谱（发射线比和通量），并测试不同物理参数的检索。我们发现Baldwin等人的标准诊断比率适合。 (1981) plus [O II]3726,3729/[O III]5007, Hbeta/ Halpha, [O I]6300/[O II]3726,3729 and Halpha flux, degeneracies remain between dust-to-metal mass ratio and ionisation parameter in the NLR gas, and between slope of the ionizing radiation (characterising the emission from the accretion disc around中央黑洞）和总积聚纸亮度。由于这些变性偏向于其他参数的检索，即使在最大信号噪声比（S/N）时也没有其他观察力，因此我们建议在NLR和HII区域固定电离辐射的斜率和尘埃 - 金属质量比。 We explore the S/N in Hbeta required for un-biased estimates of physical parameters, finding that S/N(Hbeta)~10 is sufficient to identify a NLR contribution, but that higher S/N is required for un-biased parameter retrieval (~20 for NLR-dominated systems, ~sim30 for objects with approximately-equal Hbeta contributions from NLR and HII regions).我们还将模型的不同线比的预测与以前发布的模型和数据进行了比较。通过将[He II] 4686-Line测量值添加到463 AGN NLR样本的一组已发行的线路通量中，我们表明我们的模型在NLR GAS $ <-1.5 $中具有$ -4 <$ ionisation参数，可以在本地宇宙中占全面观察到的AGN属性。
We present the addition of nebular emission from the narrow-line regions (NLR) surrounding active galactic nuclei (AGN) to BEAGLE (BayEsian Analysis of GaLaxy sEds). Using a set of idealised spectra, we fit to a set of observables (emission-line ratios and fluxes) and test the retrieval of different physical parameters. We find that fitting to standard diagnostic-line ratios from Baldwin et al. (1981) plus [O II]3726,3729/[O III]5007, Hbeta/ Halpha, [O I]6300/[O II]3726,3729 and Halpha flux, degeneracies remain between dust-to-metal mass ratio and ionisation parameter in the NLR gas, and between slope of the ionizing radiation (characterising the emission from the accretion disc around the central black hole) and total accretion-disc luminosity. Since these degeneracies bias the retrieval of other parameters even at maximal signal-to-noise ratio (S/N), without additional observables, we suggest fixing the slope of the ionizing radiation and dust-to-metal mass ratios in both NLR and HII regions. We explore the S/N in Hbeta required for un-biased estimates of physical parameters, finding that S/N(Hbeta)~10 is sufficient to identify a NLR contribution, but that higher S/N is required for un-biased parameter retrieval (~20 for NLR-dominated systems, ~sim30 for objects with approximately-equal Hbeta contributions from NLR and HII regions). We also compare the predictions of our models for different line ratios to previously-published models and data. By adding [He II]4686-line measurements to a set of published line fluxes for a sample of 463 AGN NLR, we show that our models with $-4<$ionisation parameter in the NLR gas$<-1.5$ can account for the full range of observed AGN properties in the local Universe.
