论文标题
Alpine-Alma [CII]调查：[CII]未经搜索星系的人口及其在$ \ Mathrm {L _ {[CII]}} $ - SFR关系中的作用
The ALPINE-ALMA [CII] Survey: the population of [CII]-undetected galaxies and their role in the $\mathrm{L_{[CII]}}$-SFR relation
论文作者
论文摘要
[CII] 158 $ 〜μ $ M排放线代表了迄今为止研究早期宇宙中高红移星系的最有利可图的工具之一。它是恒星形成星系的休息框远红外制度中最明亮的冷却线之一，已成功利用了当地来源的恒星形成率（SFR）的示踪剂。在较高的红移中，图片在此上下文中仍在调查中更为复杂。 ALMA大型计划在早期调查（ALPINE）调查的最新结果表明，L $ \ Mathrm {_ {[[CII]}} $ - SFR关系最高$ z \ sim6 $没有（或弱）演变，但是它们的可靠性受到了[CII Int-detected callaxies]的大量人群而受到阻碍。在这项工作中，我们表征了高山中[CII]非探测的种群。通过堆叠他们的ALMA光谱，我们获得了以$ \sim5.1σ$检测到的信号，从而产生了$ \ mathrm {log（l_ \ mathrm {[cii]}}/\ mathrm {log（l_ \ mathrm {log）的[cii]光度。将此值与[CII]检测的值结合在一起时，我们发现了一个$ \ mathrm {l _ {[[CII]}} $ - SFR与Slope $ b = 1.14 \ pm0.11 $之间的关系，在不确定性的一致性中，两者都在本地宇宙中发现了线性的关系，并与以前的Findings一起发现了Alpine $ a alpine $。这表明[CII]线可以被认为是遥远宇宙的恒星形成的好示踪剂。最后，我们表明，我们的样本的星系与观察到的l $ _ \ mathrm {[CII]} $ - SFR关系可能会受到不太精确的红移估计的影响，可能会人为地降低他们的[CII]亮度。在这方面，我们声称没有证据表明高Z星系中[CII]含量的不足，而与较早的研究相反。
The [CII] 158$~μ$m emission line represents so far one of the most profitable tools for the investigation of the high-redshift galaxies in the early Universe. Being one of the brightest cooling lines in the rest-frame far-infrared regime of star-forming galaxies, it has been successfully exploited as a tracer of star-formation rate (SFR) in local sources. The picture is more complex at higher redshifts, where its usability in this context is still under investigation. Recent results from the ALMA Large Program to INvestigate [CII] at Early times (ALPINE) survey suggest that there is no (or weak) evolution of the L$\mathrm{_{[CII]}}$-SFR relation up to $z\sim6$ but their reliability is hampered by the presence of a large population of [CII] non-detected galaxies. In this work, we characterize the population of [CII] non-detections in ALPINE. By stacking their ALMA spectra, we obtain a signal detected at $\sim5.1σ$, resulting in a [CII] luminosity of $\mathrm{log(L_\mathrm{[CII]}}/\mathrm{L_{\odot}})$ $\sim7.8$. When combining this value with those from the [CII] detections, we find a $\mathrm{L_{[CII]}}$-SFR relation with a slope $b=1.14\pm0.11$, in agreement within the uncertainties both with the linear relation found in the local Universe, and with the previous findings from ALPINE at $z\sim5$. This suggests that the [CII] line can be considered a good tracer of star formation up to the distant Universe. Finally, we show that the galaxies of our sample that most deviate from the observed L$_\mathrm{[CII]}$-SFR relation could suffer from a less precise redshift estimation, perhaps artificially reducing their [CII] luminosity. In this respect, we claim that there is no evidence in favour of a deficit of [CII] content in high-z galaxies, in contrast with earlier studies.
