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首页> 外文期刊>The Astrophysical journal >THE DEEP X-RAY RADIO BLAZAR SURVEY. III. RADIO NUMBER COUNTS, EVOLUTIONARY PROPERTIES, AND LUMINOSITY FUNCTION OF BLAZARS
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THE DEEP X-RAY RADIO BLAZAR SURVEY. III. RADIO NUMBER COUNTS, EVOLUTIONARY PROPERTIES, AND LUMINOSITY FUNCTION OF BLAZARS

机译：深入的X射线无线电盲区调查。三， Blazars的无线电数计数，演化特性和光度函数

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摘要

Our knowledge of the blazar surface densities and luminosity functions, which are fundamental parameters, relies still on samples at relatively high flux limits. As a result, our understanding of this rare class of active galactic nuclei is mostly based on relatively bright and intrinsically luminous sources. We present the radio number counts, evolutionary properties, and luminosity functions of the faintest blazar sample with basically complete (~95%) identifications. Based on the Deep X-Ray Radio Blazar Survey (DXRBS), it includes 129 flat-spectrum radio quasars (FSRQs) and 24 BL Lac objects down to a 5 GHz flux and power ～50 mJy and ～10~(24) W Hz~(-1), respectively, an order of magnitude improvement as compared to previously published (radio-selected) blazar samples. DXRBS FSRQs are seen to evolve strongly, up to redshift ≈ 1.5, above which high-power sources show a decline in their comoving space density. DXRBS BL Lac objects, on the other hand, do not evolve. High-energy and low-energy peaked BL Lac objects (HBLs and LBLs, respectively) share the same lack of cosmological evolution, which is at variance with some previous results. The observed luminosity functions are in good agreement with the predictions of unified schemes, with FSRQs getting close to their expected minimum power. Despite the fact that the large majority of our blazars are FSRQs, BL Lac objects are intrinsically ～50 times more numerous. Finally, the relative numbers of HBLs and LBLs in the radio and X-ray bands are different from those predicted by the so-called blazar sequence and support a scenario in which HBLs represent a small minority (≈ 10%) of all BL Lac objects.
机译：我们对blazar表面密度和光度函数（这是基本参数）的了解仍然依赖于相对较高通量极限的样品。结果，我们对这种稀有类别的活动银河核的理解主要是基于相对明亮和固有发光的光源。我们介绍了最薄的blazar样本的无线电数量计数，进化性质和发光度函数，并具有基本完整的识别（〜95％）。它基于深层X射线无线电震荡调查（DXRBS），包括129个平谱无线电类星体（FSRQ）和24个低5 GHz通量，功率分别为〜50 mJy和〜10〜（24）W Hz的BL Lac对象与以前发布的（无线电选择的）blazar样本相比，分别提高了约（-1）个数量级。可以看到DXRBS FSRQ的发展非常强劲，直到红移≈1.5，在此之上，高功率源的共同移动空间密度下降。另一方面，DXRBS BL Lac对象不会进化。高能峰和低能峰BL Lac对象（分别为HBLs和LBLs）共享宇宙学演化的相同缺失，这与某些先前的结果有所不同。观测到的光度函数与统一方案的预测非常吻合，FSRQ接近其预期的最小功率。尽管事实是我们的大多数blazar是FSRQ，但BL Lac对象本质上是数量的50倍左右。最后，无线电带和X射线带中HBL和LBL的相对数量与所谓的blazar序列所预测的相对数量不同，并且支持HBL占所有BL Lac对象的一小部分（约10％）的方案。

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