Relations between the IR-UV-X-ray Continuum and Emission Lines for a Large Composite Sample of Narrow Line and Normal Seyfert 1 Galaxies     

You-Jun Lu  Chong-Shan Zhao 《中国天文和天体物理学报》2001,(1)

1 INTRODUCTIONThe broad emission lines, the most important characteristics of active galactic nuclei (AGN),are generally believed to be emitted by photoionized gas in the clouds that are illuminated bythe UV to X-ray continuum radiation of the celltral source (Netzer 1990). The photoionizationmodel is quite successful in explaining the average emission line properties of AGNs using anaverage ionizing continuum. To date, there are two sets of statistical relationships between thecolltin…  相似文献   

基于数据库的地球化学异常特征参数计算方法     

张崇山  韩亚彬 《物探与化探》2019,(1):148-152

介绍了在地球化学普查中,一种单元素异常特征参数的计算方法。在确定了单元素异常下限,建立了取样点位数据图层,完成了单元素异常图制作的基础上,将单元素异常区图层与点位数据图层做点对区的相交分析,把单元素异常区中异常编号、异常面积字段的空间信息相交分析到异常区内点位数据图层中,将该点图层属性转换成DBF文件,应用FORXPRO软件编写了程序,从而计算单元素异常特征参数。  相似文献