对sub-mJy群体、建模和未来深度调查前景的看法
A view of the sub-mJy populations, modelling and perspectives for future deep surveys
摘要：
我们使用深多色（UBVRIJK）图像主要是在ESO深度公众调查（DPS）的框架下拍摄的，以光学方式识别和推导出131个射电源的完整样本的光度红移，S>0.4 mJy，在1.4和5 GHz的ATESP无线电调查的一部分。利用多波长无线电和光学信息的可用性来推断微弱无线电群体的物理特性。特别是，我们发现，考虑到早期类型的星系和类星体作为源与活跃的核心，活动星系核在很大程度上占主导地位，我们的样本次mJy样本（78%）。进一步的射电/光学分析揭示了一种出乎意料的低射电/光学比（R<100）的平谱/倒谱源，它们优先被识别为早期类型的星系。这样的源是相当紧凑的（d<10-30 kpc），表明低光度活动星系核触发的核心主导的无线电发射。这类有趣的天体值得进一步分析，目前正在进行新的更高分辨率的射电观测。与此同时，我们正在开发的无线电源模型，为AGN和恒星形成的组件的sub-mJy无线电pupulation。在这里，我们讨论第一个结果。
英文摘要：
We use deep multi-colour (UBVRIJK) images mostly taken in the framework of the ESO Deep Public Survey (DPS) to optically identify and derive photometric redshifts for a complete sample of 131 radio sources with S>0.4 mJy, observed at both 1.4 and 5 GHz as part of the ATESP radio survey. The availability of multi-wavelength radio and optical information is exploited to infer the physical properties of the faint radio population. In particular we find that, considering both early-type galaxies and quasars as sources with an active nucleus, AGNs largely dominate our sample sub-mJy sample (78%). Further radio/optical analysis of such AGN component has revealed a somewhat unexpected class of flat/inverted-spectrum sources with low radio-to-optical ratios (R<100), which are preferentially identified with early-type galaxies. Such sources are quite compact (d<10-30 kpc), suggesting core-dominated radio emission triggered by low luminosity AGNs. This intriguing class of objects deserves further analysis, and new higher resolution radio observations are currently under way. In parallel we are developing radio source models, for both the AGN and the star-forming components of the sub-mJy radio pupulation. Here we discuss the first results.
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