TESTING THE HOMOGENEITY OF BRIGHT RADIO SOURCES AT 15 GHz
TESTING THE HOMOGENEITY OF BRIGHT RADIO SOURCES AT 15 GHz
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DOI：
10.1142/9789812702432_0035
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发表时间：
2004-03
影响因子：
3.5
通讯作者：
T. Arshakian;E. Ros;J. A. Zensus;M. Lister
中科院分区：
文献类型：
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作者：
T. Arshakian;E. Ros;J. A. Zensus;M. Lister
本文对一个2cm射电强活动星系核样品进行了观测，以检验射电源在天空中的各向同性分布和在空间中的均匀分布。该样品是完整的通量密度极限为1.5Jy的正磁偏角和2 Jy的0和-20度之间的磁偏角。活动星系核样本由133个成员组成。二维Kolmogorov-Smirnov检验表明，AGN在天空中的分布与各向同性分布没有明显的偏离，而广义V/Vm检验则表明，AGN在高置信度（99.9%）下的空间分布是不均匀的。这是一个强烈的积极的演化活动星系核与宇宙时代意味着活动星系核（或喷流活动现象）在高红移人口。结果表明，演化强烈地依赖于光度：低光度类星体表现出强烈的正演化，而高光度类星体似乎没有表现出任何演化与宇宙时代。
A sample of radio-loud active galactic nuclei (AGN) at 2cm is studied to test the isotropic distribution of radio sources in the sky and their uniform distribution in space. The sample is complete flux-density limits of 1.5Jy for positive declinations and 2Jy for declinations between 0 and -20 degrees. The active galactic nuclei sample comprises of 133 members. Application of the two-dimensional Kolmogorov-Smirnov test shows that there is no significant deviation from the isotropic distribution in the sky, while the generalised V/Vm test shows that the space distribution of AGN is not uniform at high confidence level (99.9%). This is indicative of a strong positive evolution of AGN with cosmic epoch implying that AGN (or jet activity phenomena) were more populous at high redshifts. It is shown that the evolution depends strongly on luminosity: low-luminosity QSOs show a strong positive evolution, while high-luminosity counterparts do not seem to show any evolution with cosmic epoch.