论文标题
重新启动：无线电连续红移agns
RAiSERed: radio continuum redshifts for lobed AGNs
论文作者
论文摘要
预计下一代无线电调查将检测数以千计的活性银河核（AGN），中位红移的中间红移> 1。除了有针对性的调查之外，这些物体中的绝大多数都不会具有光谱型红移，而高质量的agns则具有限制性的质量，并且需要质量的质量，并且需要质量的光度。我们提出了一种新方法，以基于射频成像和宽带无线电光度法来测量裂片射电星系的红移。具体而言，我们的算法使用叶通量密度，角度的大小和宽度以及光谱形状来得出基于半分析环境（升高）动力学模型中无线电AGN的最可能源红移的概率密度函数。完整的基于物理的模型解释了无线电AGN的高红移（2 <z <4）样品的光谱红移中的70％，而分别观察到的任何一种观察到的属性中的任何一种。我们发现，正如未解决的来源所预期的那样，角度上的上限足以在z> 2处产生准确的红移测量。模型在校准后使用至少九个具有已知光谱红移<14％的校准后的误差在所有redshifts中<14％）。我们提供Python代码，用于在线库中的无线电连续式红移的计算和校准。
Next-generation radio surveys are expected to detect tens of millions of active galactic nuclei (AGN) with a median redshift of z > 1. Beyond targeted surveys, the vast majority of these objects will not have spectroscopic redshifts, whilst photometric redshifts for high-redshift AGNs are of limited quality, and even then require optical and infrared photometry. We propose a new approach to measure the redshifts of lobed radio galaxies based exclusively on radio-frequency imaging and broadband radio photometry. Specifically, our algorithm uses the lobe flux density, angular size and width, and spectral shape to derive probability density functions for the most likely source redshift based on the Radio AGN in Semi-analytic Environments (RAiSE) dynamical model. The full physically based model explains 70% of the variation in the spectroscopic redshifts of a high-redshift (2 < z < 4) sample of radio AGNs, compared to at most 27% for any one of the observed attributes in isolation. We find that upper bounds on the angular size, as expected for unresolved sources, are sufficient to yield accurate redshift measurements at z > 2. The error in the model upon calibration using at least nine sources with known spectroscopic redshifts is <14% in redshift (as 1 + z) across all redshifts. We provide python code for the calculation and calibration of our radio continuum redshifts in an online library.
