首页> 外文期刊>The Astrophysical journal >MOJAVE: MONITORING OF JETS IN AGN WITH VLBA EXPERIMENTS. Ⅳ. THE PARENT LUMINOSITY FUNCTION OF RADIO-LOUD BLAZARS
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MOJAVE: MONITORING OF JETS IN AGN WITH VLBA EXPERIMENTS. Ⅳ. THE PARENT LUMINOSITY FUNCTION OF RADIO-LOUD BLAZARS

机译:MOJAVE:使用VLBA实验监控AGN中的飞机。 Ⅳ。放射性大肠癌的母体发光功能

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摘要

We use a complete sample of active galactic nuclei (AGN) selected on the basis of relativistically beamed 15 GHz radio flux density (MOJAVE: Monitoring of Jets in AGN with VLBA Experiments) to derive the parent radio luminosity function (RLF) of bright radio-selected blazar cores. We use a maximum likelihood method to fit a beamed RLF to the observed data and thereby recover the parameters of the intrinsic (unbeamed) RLF. We analyze two sub-samples of the MOJAVE sample: the first contains only objects of known FR II class, with a total of 103 sources, and the second subsample adds 24 objects of uncertain FR class for a total of 127 sources. Both subsamples exclude four known FR I radio galaxies and two gigahertz-peaked spectrum sources. We obtain good fits to both subsamples using a single power law intrinsic RLF and a pure density evolution function of the form z~m exp{ - 1/2[(z - zo)/σ]~2 }. We find that a previously reported break in the observed MOJAVE RLF actually arises from using incomplete bins (because of the luminosity cutoff) across a steep and strongly evolving RLF, and does not reflect a break in the intrinsic RLF. The derived space density of the parent population of the FR II sources from the MOJAVE sample (with L_(15 GHz) ≥ 1.3 × 10~(25) W Hz~(-1)) is approximately 1.6 × 10~3 Gpc~(-3).
机译:我们使用了相对论性的15 GHz射束通量密度(MOJAVE:使用VLBA实验对AGN中的喷气机进行监测)选择的完整的活动银河原子核(AGN)样本,得出了明亮的射电的母体射电光度函数(RLF),精选的Blazar核心。我们使用最大似然方法将波束的RLF拟合到观测到的数据,从而恢复固有(未波束)RLF的参数。我们分析了MOJAVE样本的两个子样本:第一个子样本仅包含已知FR II类的对象,共有103个来源,第二个子样本为总共127个来源添加了24个不确定的FR类的对象。这两个子样本都排除了四个已知的FR I无线电星系和两个兆赫峰的频谱源。我们使用单个幂律固有RLF和z〜m exp {-1/2 [(z-zo)/σ]〜2}形式的纯密度演化函数对两个子样本都取得了很好的拟合。我们发现,先前报告的观测到的MOJAVE RLF破裂实际上是由于在陡峭且强烈演化的RLF上使用不完整的仓(由于光度截止)而引起的,并不反映本征RLF的破裂。从MOJAVE样本(L_(15 GHz)≥1.3×10〜(25)W Hz〜(-1))得出的FR II源母体的空间密度约为1.6×10〜3 Gpc〜( -3)。

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