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首页> 外文期刊>The Astrophysical journal >EIGENVECTOR l: AN OPTIMAL CORRELATION SPACE FOR ACTIVE GALACTIC NUCLEI
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EIGENVECTOR l: AN OPTIMAL CORRELATION SPACE FOR ACTIVE GALACTIC NUCLEI

机译：EIGENVECTOR l：有源银河系核的最佳相关空间

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摘要

We identify a correlation space involving optical and UV emission-line parameters as well as the soft X-ray spectral index that provides optimal discrimination between all principal classes of active galactic nuclei (AGNs). Most of the sources in our three high-quality data samples show a strong intercorrelation with narrow-line Seyfert l (NLSyl) galaxies and steep-spectrum radio galaxies occupying opposite extrema in the space. NLSyl sources show a clear continuity with broader line sources, indicating that they are not a disjoint class of AGN as is sometimes suggested. We interpret the principal intercorrelation in the parameter space as being driven by the AGN luminosity--to--black hole mass ratio (L/M is proportional to the Eddington ratio). Source orientation no doubt also plays an important role, but it is not yet clear whether FWHM Hβ or C Iv λl549 line shift is the better indicator. We tentatively identify two radio-quiet populations f an almost pure radio-quiet population A, with FWHM ≤ 4000, and population B, which occupies the same parameter domain as the flat-spectrum radio- loud sources. A possible interpretation sees population AfNLSyl as lower mass/high accretion rate sources and population B/radio-loud sources as the opposite.
机译：我们确定了一个相关的空间，其中涉及光学和紫外线发射线参数以及软X射线光谱指数，该指数可提供所有主要类别的活动银河核（AGNs）之间的最佳区分。我们三个高质量数据样本中的大多数源都显示出与空间中相对极值的窄线塞弗特（NLSyl）星系和陡谱射电星系之间的强相关性。 NLSyl资料源与更广泛的资料源具有明显的连续性，表明它们并非有时建议的AGN的不相交类别。我们将参数空间中的主要互相关解释为由AGN发光度与黑洞质量之比（L / M与Eddington之比成比例）驱动。光源方向无疑也起着重要的作用，但尚不清楚FWHMHβ或Cvλl549线位移是否是更好的指标。我们初步确定两个无线电安静的人口，即一个FWHM≤4000的几乎纯净的无线电安静的人口A和人口B，它们与平面频谱无线电噪声源具有相同的参数域。可能的解释是，种群AfNLSyl是较低的质量/高吸积率来源，而种群B /无线电是相反的。

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