论文标题
将Meerkat无线电连续性属性连接到GAMA光学发射线和明智的中红外活动
Connecting MeerKAT radio continuum properties to GAMA optical emission-line and WISE mid-infrared activity
论文作者
论文摘要
大型调查中AGN的鉴定受到了看似不一致的分类，这是由于诊断方法不同而引起的，通常会追踪特定的特定波长制度的不同过程。但是，如Yao等人所示。 （2020），光发射线测量和中红外光度法的组合可用于优化AGN和恒星形成活性之间的歧视能力。在本文中，我们通过将现有的GAMA数据与高质量的Meerkat Radio Continuum数据相结合，涵盖GAMA G23区域的8度$^2 $来测试我们的新分类方案。使用该样本的1 841个星系（z <0.25），我们研究了总红外（从12 $ $ m）与无线电亮度比，Q（TIR）及其与光含量AGN和Star-Forming（SF）分类的关系。我们发现，尽管Q（TIR）在通常在红外线中出现静止的大型星系中检测AGN活性有效，但对于宿主星系中恒星形成发射的情况下，它的可靠性降低了。但是，我们发现Q（TIR）可以在光学和/或红外波长下识别出多达70％的AGN。我们的SF样本的中值Q（TIR）为2.57 $ \ pm $ 0.23与以前的本地宇宙估计一致。
The identification of AGN in large surveys has been hampered by seemingly discordant classifications arising from differing diagnostic methods, usually tracing distinct processes specific to a particular wavelength regime. However, as shown in Yao et al. (2020), the combination of optical emission line measurements and mid-infrared photometry can be used to optimise the discrimination capability between AGN and star formation activity. In this paper we test our new classification scheme by combining the existing GAMA-WISE data with high-quality MeerKAT radio continuum data covering 8 deg$^2$ of the GAMA G23 region. Using this sample of 1 841 galaxies (z < 0.25), we investigate the total infrared (derived from 12$μ$m) to radio luminosity ratio, q(TIR), and its relationship to optical-infrared AGN and star-forming (SF) classifications. We find that while q(TIR) is efficient at detecting AGN activity in massive galaxies generally appearing quiescent in the infrared, it becomes less reliable for cases where the emission from star formation in the host galaxy is dominant. However, we find that the q(TIR) can identify up to 70 % more AGNs not discernible at optical and/or infrared wavelengths. The median q(TIR) of our SF sample is 2.57 $\pm$ 0.23 consistent with previous local universe estimates.
