使用MOJAVE和GLAST的Blazar人口统计学
Blazar Demographics with MOJAVE and GLAST
摘要：
MOJAVE是一个长期的VLBA计划，研究133个活动星系核的完整样本的运动学和偏振演化的基础上选择的紧凑，相对论束喷流发射在15 GHz的。通过拟合超光速和喷流光度的表观分布，我们可以约束射电选择的blazar母体的洛伦兹因子分布和内禀光度函数。这些低能量的尖峰耀变体构成了所有EGRET探测到的一个重要部分，应该在GLAST源目录中占据突出地位。使用简单的模型，我们调查的预测分布的GLAST耀变体的伽玛射线/无线电通量密度平面，并描述了一个扩展的MOJAVE调查，将提供广泛的秒差距尺度的射流信息在这个平面的完整区域。我们发现，如果一个人口的本质上无线电明亮，但γ射线弱耀变体存在，它的信号将在很大程度上被抹去的大γ射线通量散射与多普勒波束。
英文摘要：
MOJAVE is a long term VLBA program to investigate the kinematics and polarization evolution of a complete sample of 133 active galactic nuclei selected on the basis of compact, relativistically beamed jet emission at 15 GHz. By fitting to the apparent distributions of superluminal speed and jet luminosity, we can constrain the Lorentz factor distribution and intrinsic luminosity function of the radio-selected blazar parent population. These low-energy peaked blazars formed a significant fraction of all EGRET detections, and should figure prominently in the GLAST source catalog. Using simple models, we investigate the predicted distribution of GLAST blazars in the gamma-ray/radio flux density plane, and describe an extension of the MOJAVE survey that will provide extensive parsec-scale jet information in complete regions of this plane. We find that if a population of intrinsically radio bright yet gamma-ray weak blazars exists, its signal will be largely wiped out by the large gamma-ray flux scatter associated with Doppler beaming.
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