活动星系核大蓝包的峰值在1050附近吗?  

Is the Big Blue Bump in Active Galactic Nuclei Peaked Around the 1050■?

作　　者：黄双安[1] 周又元[1] 王挺贵[1] 

机构地区：[1]中国科学技术大学天体物理中心

出　　处：《天体物理学报》2000年第3期225-232,共8页

基　　金：国家自然科学基金;国家攀登计划基金;国家教委博士点基金;国家重点基础研究发展规划项目!937;中国科学院创新工程基金

摘　　要：对中小红移不同光度AGN的大蓝包位置进行了统计检验．主要统计方法是对比软X射线波段谱指数（asx）分布与“直线”连接紫外1050■和软X射线0．5keV的幂指数（αuv-sx）分布．经过平均值统计和K－S检验，表明二者分布是类似的．因此，在1050■至O．5keV中可能是幂律谱，统计预言大蓝包峰值在1050■附近．这个统计结果在软X选低光度AGN样本（WF93）上亦能得到．这表明WF93样品尽管普遍存在软X过剩，大蓝包峰值仍可能在1050■附近．但是，软X射线谱指数。αsx与1050■到0.5keV间“直线”连接的幂指数αuv-sx没有相关性，说明还存在一种不明的、但在远紫外（FUV）和极紫外（EUV）谱中起作用的因素，它既能保证。。αuv-sx与αsx的分布在总体上的一致性，又使二者不具备—一对等的关系．We carried out a statistical test on the peak position of the big blue bump (BBB) of medium/small redshift AGNs of different luminosities. The main method is to compare the spectral index in the soft X-ray, asx and the power law index for the straight line joining 1050 ■ in UV and 0.5 keV of soft X-ray, cruv-sx. The distributions of these tw0 quantities proved to be similar from their mean values and by the K-S test. Hence, between 1050■ and 0.5 keV, a power law possibly holds. The statistics predict that the BBB peaks around 1050 ■. This statistical result can also be obtained in the soft X-ray-selected, low luminosity AGN sample, WF 93. This shows that, even though a soft X-ray excess generally exists in WF93, the BBB may still peak around 1050A. However, there is no correlation between crsx and auv-sx，indicating that there is still an unkn0wn factor operating in the far and extreme ultraviolet (FUV and EUV), which while ensuring overall similarity in distribution,inhibits one-to-one correspondence between individual values.

关 键 词：活动星系核 紫外 X射线 大蓝包 峰值 

分 类 号：P14[天文地球—天体物理]