论文标题
活性银核的代表性样本中的方向和积聚
Orientation and accretion in a representative sample of active galactic nuclei
论文作者
论文摘要
我们强调了独立于方向的主动银河核的代表性样本。选择的定义特征是从第七个数据发布到325 MHz的Westerbork Northern Sky Survey的$ 0.1 <z <z <z <z <0.6 $ sloan数字调查的类星体之间的复杂匹配，以及随后削减无线电亮度的总应用。所得的样品完全归结为有限的光度，并取决于方向。与文献中的取向样品相比，这种方法与红移，相对较高的叶片主导的来源（包括无线电裂片和没有可见核心的岩体）产生的偏差较小，并且无线电核心优势的分布与固体角度均匀分布的倾斜度均匀分布相一致。我们测量光谱的性能，并使用样品研究宽H $β$发射线的速度宽度的方向依赖性。我们恢复已知的取向依赖性，但是没有边缘源显示最广泛的线条的先前研究的尖锐信封是不存在的。该图中的散射不仅归因于黑洞质量，爱丁顿比率或来自紧凑型陡峭频谱源的样品中的污染。当将磁盘样的物理框架和类似磁盘的宽线区域进行扩展时，可以描述代表性样本以包括其他参数，尤其是JET属性和宽线区域速度场。这些点可以说明样品选择在解释可观察的特性作为Quasar Central引擎物理参数的指标中的关键作用。
We highlight a representative sample of active galactic nuclei selected independent of orientation. The defining characteristic of the selection is sophisticated matching between the $0.1<z<0.6$ Sloan Digital Sky Survey quasars from the Seventh Data Release to the Westerbork Northern Sky Survey at 325 MHz and the subsequent application of a total radio luminosity cut. The resulting sample is complete down to the limiting luminosity and unbiased by orientation. Compared to orientation samples in the literature this approach yields less bias with redshift, relatively more lobe-dominated sources including those with radio lobes and no visible core, and a distribution of radio core dominance that is consistent with expectations from a uniform distribution of inclinations with solid angle. We measure properties of the optical spectra, and use the sample to investigate the orientation dependence of the velocity width of the broad H$β$ emission line. We recover the known orientation dependence, but the sharp envelope of previous studies where only edge-on sources display the broadest lines, is absent. Scatter in this diagram is not attributable solely to black hole mass, Eddington ratio, or contamination in the sample from compact steep spectrum sources. A physical framework for quasar beaming and a disk-like broad-line region can describe the representative sample when it is expanded to include additional parameters, in particular jet properties and the broad-line region velocity field. These points serve to illustrate the critical role of sample selection in the interpretation of observable properties as indicators of physical parameters of quasar central engines.
