论文标题
在商品-S/HUDF中完成AGN的人口普查：新的超深广播成像和JWST的预测
Completing the Census of AGN in GOODS-S/HUDF: New Ultra-Deep Radio Imaging and Predictions for JWST
论文作者
论文摘要
对活性银河核（AGN）及其宿主星系的全球理解取决于完成AGN活性的普查而没有选择偏见到低亮度状态。为了实现这一目标，我们在宇宙中午的淡淡无线电种群中识别从新的超深，高分辨率成像中从Karl G. Jansky进行的，在6和3 GHz时非常大的阵列。这些无线电数据在空间上与商品-S/HUDF区域的超深旧约调查相吻合，尤其是无与伦比的Chandra 7 ms X射线成像。这些数据集结合在一起为AGN的彻底普查提供了独特的基础，从而通过（1）高X射线光度同时识别； （2）硬X射线光谱； （3）相对于6 GHz的过量X射线； （4）中红色颜色； （5）SED配件； （6）通过无线电关系多余的无线电； （7）通过多波段无线电平坦的无线电光谱； （8）光谱法。我们在完全淡淡的无线电样品中发现了AGN，表明一个Agn Arcmin $^{ - 2} $的源密度，在同一区域上通过X射线标识了相似数量的无线电未搜索的AGN。我们的无线电检测AGN是多数放射性广播，无线电发射与主要由恒星形成为主要动力一致。尽管如此，我们在样本中找到了AGN无线电签名：$ \ sim12 \％$，无线电超过无线电活动，$ \ sim16 \％$ $ $ \％$ $ $ \％$ $ $ \％$ $ $ \％$ $ $ \％$ $。后者是下限，等待我们即将进行的更深入的3 GHz调查。最后，尽管这些广泛的数据集，但这项工作仍然可能缺少严重的AGN。我们详细讨论了这种难以捉摸的人群以及使用JWST/Miri完成AGN人口普查的前景。
A global understanding of Active Galactic Nuclei (AGN) and their host galaxies hinges on completing a census of AGN activity without selection biases down to the low-luminosity regime. Toward that goal, we identify AGN within faint radio populations at cosmic noon selected from new ultra-deep, high resolution imaging from the Karl G. Jansky Very Large Array at 6 and 3 GHz. These radio data are spatially coincident with the ultra-deep legacy surveys in the GOODS-S/HUDF region, particularly the unparalleled Chandra 7 Ms X-ray imaging. Combined, these datasets provide a unique basis for a thorough census of AGN, allowing simultaneous identification via (1) high X-ray luminosity; (2) hard X-ray spectra; (3) excess X-ray relative to 6 GHz; (4) mid-IR colors; (5) SED fitting; (6) radio excess via the radio-infrared relation; (7) flat radio spectra via multi-band radio; and (8) optical spectroscopy. We uncover AGN in fully half our faint radio sample, indicating a source density of one AGN arcmin$^{-2}$, with a similar number of radio-undetected AGN identified via X-ray over the same area. Our radio-detected AGN are majority radio-quiet, with radio emission consistent with being powered predominantly by star formation. Nevertheless, we find AGN radio signatures in our sample: $\sim12\%$ with radio excess indicating radio-loud activity and $\sim16\%$ of radio-quiet AGN candidates with flat or inverted radio spectra. The latter is a lower limit, pending our upcoming deeper 3 GHz survey. Finally, despite these extensive datasets, this work is likely still missing heavily obscured AGN. We discuss in detail this elusive population and the prospects for completing our AGN census with JWST/MIRI.
